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Merge branch 'akpm' (Andrew's patch-bomb)

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Merge first batch of patches from Andrew Morton:
 "A few misc things and all the MM queue"

* emailed from Andrew Morton <akpm@linux-foundation.org>: (92 commits)
  memcg: avoid THP split in task migration
  thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE
  memcg: clean up existing move charge code
  mm/memcontrol.c: remove unnecessary 'break' in mem_cgroup_read()
  mm/memcontrol.c: remove redundant BUG_ON() in mem_cgroup_usage_unregister_event()
  mm/memcontrol.c: s/stealed/stolen/
  memcg: fix performance of mem_cgroup_begin_update_page_stat()
  memcg: remove PCG_FILE_MAPPED
  memcg: use new logic for page stat accounting
  memcg: remove PCG_MOVE_LOCK flag from page_cgroup
  memcg: simplify move_account() check
  memcg: remove EXPORT_SYMBOL(mem_cgroup_update_page_stat)
  memcg: kill dead prev_priority stubs
  memcg: remove PCG_CACHE page_cgroup flag
  memcg: let css_get_next() rely upon rcu_read_lock()
  cgroup: revert ss_id_lock to spinlock
  idr: make idr_get_next() good for rcu_read_lock()
  memcg: remove unnecessary thp check in page stat accounting
  memcg: remove redundant returns
  memcg: enum lru_list lru
  ...
This commit is contained in:
Linus Torvalds 2012-03-22 09:04:48 -07:00
commit 95211279c5
77 changed files with 1902 additions and 1235 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
Documentation/filesystems/proc.txt
View File

@ -290,7 +290,7 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7)
rsslim current limit in bytes on the rss
start_code address above which program text can run
end_code address below which program text can run
start_stack address of the start of the stack
start_stack address of the start of the main process stack
esp current value of ESP
eip current value of EIP
pending bitmap of pending signals
@ -325,7 +325,7 @@ address perms offset dev inode pathname
a7cb1000-a7cb2000 ---p 00000000 00:00 0
a7cb2000-a7eb2000 rw-p 00000000 00:00 0
a7eb2000-a7eb3000 ---p 00000000 00:00 0
a7eb3000-a7ed5000 rw-p 00000000 00:00 0
a7eb3000-a7ed5000 rw-p 00000000 00:00 0 [stack:1001]
a7ed5000-a8008000 r-xp 00000000 03:00 4222 /lib/libc.so.6
a8008000-a800a000 r--p 00133000 03:00 4222 /lib/libc.so.6
a800a000-a800b000 rw-p 00135000 03:00 4222 /lib/libc.so.6
@ -357,11 +357,39 @@ is not associated with a file:
[heap] = the heap of the program
[stack] = the stack of the main process
[stack:1001] = the stack of the thread with tid 1001
[vdso] = the "virtual dynamic shared object",
the kernel system call handler
or if empty, the mapping is anonymous.
The /proc/PID/task/TID/maps is a view of the virtual memory from the viewpoint
of the individual tasks of a process. In this file you will see a mapping marked
as [stack] if that task sees it as a stack. This is a key difference from the
content of /proc/PID/maps, where you will see all mappings that are being used
as stack by all of those tasks. Hence, for the example above, the task-level
map, i.e. /proc/PID/task/TID/maps for thread 1001 will look like this:
08048000-08049000 r-xp 00000000 03:00 8312 /opt/test
08049000-0804a000 rw-p 00001000 03:00 8312 /opt/test
0804a000-0806b000 rw-p 00000000 00:00 0 [heap]
a7cb1000-a7cb2000 ---p 00000000 00:00 0
a7cb2000-a7eb2000 rw-p 00000000 00:00 0
a7eb2000-a7eb3000 ---p 00000000 00:00 0
a7eb3000-a7ed5000 rw-p 00000000 00:00 0 [stack]
a7ed5000-a8008000 r-xp 00000000 03:00 4222 /lib/libc.so.6
a8008000-a800a000 r--p 00133000 03:00 4222 /lib/libc.so.6
a800a000-a800b000 rw-p 00135000 03:00 4222 /lib/libc.so.6
a800b000-a800e000 rw-p 00000000 00:00 0
a800e000-a8022000 r-xp 00000000 03:00 14462 /lib/libpthread.so.0
a8022000-a8023000 r--p 00013000 03:00 14462 /lib/libpthread.so.0
a8023000-a8024000 rw-p 00014000 03:00 14462 /lib/libpthread.so.0
a8024000-a8027000 rw-p 00000000 00:00 0
a8027000-a8043000 r-xp 00000000 03:00 8317 /lib/ld-linux.so.2
a8043000-a8044000 r--p 0001b000 03:00 8317 /lib/ld-linux.so.2
a8044000-a8045000 rw-p 0001c000 03:00 8317 /lib/ld-linux.so.2
aff35000-aff4a000 rw-p 00000000 00:00 0
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
The /proc/PID/smaps is an extension based on maps, showing the memory
consumption for each of the process's mappings. For each of mappings there

7
Documentation/kernel-parameters.txt
View File

@ -2635,6 +2635,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
to facilitate early boot debugging.
See also Documentation/trace/events.txt
transparent_hugepage=
[KNL]
Format: [always|madvise|never]
Can be used to control the default behavior of the system
with respect to transparent hugepages.
See Documentation/vm/transhuge.txt for more details.
tsc= Disable clocksource stability checks for TSC.
Format: <string>
[x86] reliable: mark tsc clocksource as reliable, this

2
Documentation/vm/page-types.c
View File

@ -98,6 +98,7 @@
#define KPF_HWPOISON 19
#define KPF_NOPAGE 20
#define KPF_KSM 21
#define KPF_THP 22
/* [32-] kernel hacking assistances */
#define KPF_RESERVED 32
@ -147,6 +148,7 @@ static const char *page_flag_names[] = {
[KPF_HWPOISON] = "X:hwpoison",
[KPF_NOPAGE] = "n:nopage",
[KPF_KSM] = "x:ksm",
[KPF_THP] = "t:thp",
[KPF_RESERVED] = "r:reserved",
[KPF_MLOCKED] = "m:mlocked",

4
Documentation/vm/pagemap.txt
View File

@ -60,6 +60,7 @@ There are three components to pagemap:
19. HWPOISON
20. NOPAGE
21. KSM
22. THP
Short descriptions to the page flags:
@ -97,6 +98,9 @@ Short descriptions to the page flags:
21. KSM
identical memory pages dynamically shared between one or more processes
22. THP
contiguous pages which construct transparent hugepages
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data

7
arch/sparc/kernel/signal32.c
View File

@ -776,7 +776,6 @@ static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
sigset_t blocked;
int err;
if (ka->sa.sa_flags & SA_SIGINFO)
@ -787,11 +786,7 @@ static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
if (err)
return err;
sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NOMASK))
sigaddset(&blocked, signr);
set_current_blocked(&blocked);
block_sigmask(ka, signr);
tracehook_signal_handler(signr, info, ka, regs, 0);
return 0;

7
arch/sparc/kernel/signal_32.c
View File

@ -465,7 +465,6 @@ static inline int
handle_signal(unsigned long signr, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
sigset_t blocked;
int err;
if (ka->sa.sa_flags & SA_SIGINFO)
@ -476,11 +475,7 @@ handle_signal(unsigned long signr, struct k_sigaction *ka,
if (err)
return err;
sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NOMASK))
sigaddset(&blocked, signr);
set_current_blocked(&blocked);
block_sigmask(ka, signr);
tracehook_signal_handler(signr, info, ka, regs, 0);
return 0;

6
arch/sparc/kernel/signal_64.c
View File

@ -479,18 +479,14 @@ static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
sigset_t blocked;
int err;
err = setup_rt_frame(ka, regs, signr, oldset,
(ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
if (err)
return err;
sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NOMASK))
sigaddset(&blocked, signr);
set_current_blocked(&blocked);
block_sigmask(ka, signr);
tracehook_signal_handler(signr, info, ka, regs, 0);
return 0;

34
arch/x86/kernel/sys_x86_64.c
View File

@ -195,7 +195,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
unsigned long addr = addr0;
unsigned long addr = addr0, start_addr;
/* requested length too big for entire address space */
if (len > TASK_SIZE)
@ -223,25 +223,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
mm->free_area_cache = mm->mmap_base;
}
try_again:
/* either no address requested or can't fit in requested address hole */
addr = mm->free_area_cache;
start_addr = addr = mm->free_area_cache;
/* make sure it can fit in the remaining address space */
if (addr > len) {
unsigned long tmp_addr = align_addr(addr - len, filp,
ALIGN_TOPDOWN);
vma = find_vma(mm, tmp_addr);
if (!vma || tmp_addr + len <= vma->vm_start)
/* remember the address as a hint for next time */
return mm->free_area_cache = tmp_addr;
}
if (mm->mmap_base < len)
goto bottomup;
addr = mm->mmap_base-len;
if (addr < len)
goto fail;
addr -= len;
do {
addr = align_addr(addr, filp, ALIGN_TOPDOWN);
@ -263,6 +252,17 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
addr = vma->vm_start-len;
} while (len < vma->vm_start);
fail:
/*
* if hint left us with no space for the requested
* mapping then try again:
*/
if (start_addr != mm->mmap_base) {
mm->free_area_cache = mm->mmap_base;
mm->cached_hole_size = 0;
goto try_again;
}
bottomup:
/*
* A failed mmap() very likely causes application failure,

2
arch/x86/kernel/vm86_32.c
View File

@ -172,6 +172,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
spinlock_t *ptl;
int i;
down_write(&mm->mmap_sem);
pgd = pgd_offset(mm, 0xA0000);
if (pgd_none_or_clear_bad(pgd))
goto out;
@ -190,6 +191,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
}
pte_unmap_unlock(pte, ptl);
out:
up_write(&mm->mmap_sem);
flush_tlb();
}

28
arch/x86/mm/hugetlbpage.c
View File

@ -308,10 +308,11 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
{
struct hstate *h = hstate_file(file);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev_vma;
unsigned long base = mm->mmap_base, addr = addr0;
struct vm_area_struct *vma;
unsigned long base = mm->mmap_base;
unsigned long addr = addr0;
unsigned long largest_hole = mm->cached_hole_size;
int first_time = 1;
unsigned long start_addr;
/* don't allow allocations above current base */
if (mm->free_area_cache > base)
@ -322,6 +323,8 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
mm->free_area_cache = base;
}
try_again:
start_addr = mm->free_area_cache;
/* make sure it can fit in the remaining address space */
if (mm->free_area_cache < len)
goto fail;
@ -337,22 +340,14 @@ try_again:
if (!vma)
return addr;
/*
* new region fits between prev_vma->vm_end and
* vma->vm_start, use it:
*/
prev_vma = vma->vm_prev;
if (addr + len <= vma->vm_start &&
(!prev_vma || (addr >= prev_vma->vm_end))) {
if (addr + len <= vma->vm_start) {
/* remember the address as a hint for next time */
mm->cached_hole_size = largest_hole;
return (mm->free_area_cache = addr);
} else {
} else if (mm->free_area_cache == vma->vm_end) {
/* pull free_area_cache down to the first hole */
if (mm->free_area_cache == vma->vm_end) {
mm->free_area_cache = vma->vm_start;
mm->cached_hole_size = largest_hole;
}
mm->free_area_cache = vma->vm_start;
mm->cached_hole_size = largest_hole;
}
/* remember the largest hole we saw so far */
@ -368,10 +363,9 @@ fail:
* if hint left us with no space for the requested
* mapping then try again:
*/
if (first_time) {
if (start_addr != base) {
mm->free_area_cache = base;
largest_hole = 0;
first_time = 0;
goto try_again;
}
/*

2
arch/x86/mm/numa_emulation.c
View File

@ -60,7 +60,7 @@ static int __init emu_setup_memblk(struct numa_meminfo *ei,
eb->nid = nid;
if (emu_nid_to_phys[nid] == NUMA_NO_NODE)
emu_nid_to_phys[nid] = pb->nid;
emu_nid_to_phys[nid] = nid;
pb->start += size;
if (pb->start >= pb->end) {

35
arch/xtensa/kernel/signal.c
View File

@ -260,10 +260,7 @@ asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
set_current_blocked(&set);
if (restore_sigcontext(regs, frame))
goto badframe;
@ -336,8 +333,8 @@ gen_return_code(unsigned char *codemem)
}
static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe *frame;
int err = 0;
@ -422,12 +419,11 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
current->comm, current->pid, signal, frame, regs->pc);
#endif
return;
return 0;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
force_sigsegv(sig, current);
return -EFAULT;
}
/*
@ -449,11 +445,8 @@ asmlinkage long xtensa_rt_sigsuspend(sigset_t __user *unewset,
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
set_current_blocked(&newset);
regs->areg[2] = -EINTR;
while (1) {
@ -536,17 +529,11 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
/* Whee! Actually deliver the signal. */
/* Set up the stack frame */
setup_frame(signr, &ka, &info, oldset, regs);
ret = setup_frame(signr, &ka, &info, oldset, regs);
if (ret)
return ret;
if (ka.sa.sa_flags & SA_ONESHOT)
ka.sa.sa_handler = SIG_DFL;
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked, &ka.sa.sa_mask);
if (!(ka.sa.sa_flags & SA_NODEFER))
sigaddset(&current->blocked, signr);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
block_sigmask(&ka, signr);
if (current->ptrace & PT_SINGLESTEP)
task_pt_regs(current)->icountlevel = 1;

8
drivers/idle/intel_idle.c
View File

@ -507,8 +507,7 @@ int intel_idle_cpu_init(int cpu)
int num_substates;
if (cstate > max_cstate) {
printk(PREFIX "max_cstate %d reached\n",
max_cstate);
printk(PREFIX "max_cstate %d reached\n", max_cstate);
break;
}
@ -524,8 +523,9 @@ int intel_idle_cpu_init(int cpu)
dev->states_usage[dev->state_count].driver_data =
(void *)get_driver_data(cstate);
dev->state_count += 1;
}
dev->state_count += 1;
}
dev->cpu = cpu;
if (cpuidle_register_device(dev)) {

2
drivers/tty/sysrq.c
View File

@ -346,7 +346,7 @@ static struct sysrq_key_op sysrq_term_op = {
static void moom_callback(struct work_struct *ignored)
{
out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0, NULL);
out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0, NULL, true);
}
static DECLARE_WORK(moom_work, moom_callback);

2
fs/exec.c
View File

@ -822,7 +822,7 @@ static int exec_mmap(struct mm_struct *mm)
/* Notify parent that we're no longer interested in the old VM */
tsk = current;
old_mm = current->mm;
sync_mm_rss(tsk, old_mm);
sync_mm_rss(old_mm);
mm_release(tsk, old_mm);
if (old_mm) {

138
fs/hugetlbfs/inode.c
View File

@ -41,6 +41,25 @@ const struct file_operations hugetlbfs_file_operations;
static const struct inode_operations hugetlbfs_dir_inode_operations;
static const struct inode_operations hugetlbfs_inode_operations;
struct hugetlbfs_config {
uid_t uid;
gid_t gid;
umode_t mode;
long nr_blocks;
long nr_inodes;
struct hstate *hstate;
};
struct hugetlbfs_inode_info {
struct shared_policy policy;
struct inode vfs_inode;
};
static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}
static struct backing_dev_info hugetlbfs_backing_dev_info = {
.name = "hugetlbfs",
.ra_pages = 0, /* No readahead */
@ -154,10 +173,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
return addr;
}
start_addr = mm->free_area_cache;
if (len <= mm->cached_hole_size)
if (len > mm->cached_hole_size)
start_addr = mm->free_area_cache;
else {
start_addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
}
full_search:
addr = ALIGN(start_addr, huge_page_size(h));
@ -171,13 +192,18 @@ full_search:
*/
if (start_addr != TASK_UNMAPPED_BASE) {
start_addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
goto full_search;
}
return -ENOMEM;
}
if (!vma || addr + len <= vma->vm_start)
if (!vma || addr + len <= vma->vm_start) {
mm->free_area_cache = addr + len;
return addr;
}
if (addr + mm->cached_hole_size < vma->vm_start)
mm->cached_hole_size = vma->vm_start - addr;
addr = ALIGN(vma->vm_end, huge_page_size(h));
}
}
@ -238,17 +264,10 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
loff_t isize;
ssize_t retval = 0;
mutex_lock(&inode->i_mutex);
/* validate length */
if (len == 0)
goto out;
isize = i_size_read(inode);
if (!isize)
goto out;
end_index = (isize - 1) >> huge_page_shift(h);
for (;;) {
struct page *page;
unsigned long nr, ret;
@ -256,18 +275,21 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
/* nr is the maximum number of bytes to copy from this page */
nr = huge_page_size(h);
isize = i_size_read(inode);
if (!isize)
goto out;
end_index = (isize - 1) >> huge_page_shift(h);
if (index >= end_index) {
if (index > end_index)
goto out;
nr = ((isize - 1) & ~huge_page_mask(h)) + 1;
if (nr <= offset) {
if (nr <= offset)
goto out;
}
}
nr = nr - offset;
/* Find the page */
page = find_get_page(mapping, index);
page = find_lock_page(mapping, index);
if (unlikely(page == NULL)) {
/*
* We have a HOLE, zero out the user-buffer for the
@ -279,17 +301,18 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
else
ra = 0;
} else {
unlock_page(page);
/*
* We have the page, copy it to user space buffer.
*/
ra = hugetlbfs_read_actor(page, offset, buf, len, nr);
ret = ra;
page_cache_release(page);
}
if (ra < 0) {
if (retval == 0)
retval = ra;
if (page)
page_cache_release(page);
goto out;
}
@ -299,16 +322,12 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
index += offset >> huge_page_shift(h);
offset &= ~huge_page_mask(h);
if (page)
page_cache_release(page);
/* short read or no more work */
if ((ret != nr) || (len == 0))
break;
}
out:
*ppos = ((loff_t)index << huge_page_shift(h)) + offset;
mutex_unlock(&inode->i_mutex);
return retval;
}
@ -607,9 +626,15 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
spin_lock(&sbinfo->stat_lock);
/* If no limits set, just report 0 for max/free/used
* blocks, like simple_statfs() */
if (sbinfo->max_blocks >= 0) {
buf->f_blocks = sbinfo->max_blocks;
buf->f_bavail = buf->f_bfree = sbinfo->free_blocks;
if (sbinfo->spool) {
long free_pages;
spin_lock(&sbinfo->spool->lock);
buf->f_blocks = sbinfo->spool->max_hpages;
free_pages = sbinfo->spool->max_hpages
- sbinfo->spool->used_hpages;
buf->f_bavail = buf->f_bfree = free_pages;
spin_unlock(&sbinfo->spool->lock);
buf->f_files = sbinfo->max_inodes;
buf->f_ffree = sbinfo->free_inodes;
}
@ -625,6 +650,10 @@ static void hugetlbfs_put_super(struct super_block *sb)
if (sbi) {
sb->s_fs_info = NULL;
if (sbi->spool)
hugepage_put_subpool(sbi->spool);
kfree(sbi);
}
}
@ -853,10 +882,14 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_fs_info = sbinfo;
sbinfo->hstate = config.hstate;
spin_lock_init(&sbinfo->stat_lock);
sbinfo->max_blocks = config.nr_blocks;
sbinfo->free_blocks = config.nr_blocks;
sbinfo->max_inodes = config.nr_inodes;
sbinfo->free_inodes = config.nr_inodes;
sbinfo->spool = NULL;
if (config.nr_blocks != -1) {
sbinfo->spool = hugepage_new_subpool(config.nr_blocks);
if (!sbinfo->spool)
goto out_free;
}
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = huge_page_size(config.hstate);
sb->s_blocksize_bits = huge_page_shift(config.hstate);
@ -868,38 +901,12 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
goto out_free;
return 0;
out_free:
if (sbinfo->spool)
kfree(sbinfo->spool);
kfree(sbinfo);
return -ENOMEM;
}
int hugetlb_get_quota(struct address_space *mapping, long delta)
{
int ret = 0;
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
if (sbinfo->free_blocks > -1) {
spin_lock(&sbinfo->stat_lock);
if (sbinfo->free_blocks - delta >= 0)
sbinfo->free_blocks -= delta;
else
ret = -ENOMEM;
spin_unlock(&sbinfo->stat_lock);
}
return ret;
}
void hugetlb_put_quota(struct address_space *mapping, long delta)
{
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
if (sbinfo->free_blocks > -1) {
spin_lock(&sbinfo->stat_lock);
sbinfo->free_blocks += delta;
spin_unlock(&sbinfo->stat_lock);
}
}
static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
@ -919,8 +926,8 @@ static int can_do_hugetlb_shm(void)
return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group);
}
struct file *hugetlb_file_setup(const char *name, size_t size,
vm_flags_t acctflag,
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
size_t size, vm_flags_t acctflag,
struct user_struct **user, int creat_flags)
{
int error = -ENOMEM;
@ -929,6 +936,8 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
struct path path;
struct dentry *root;
struct qstr quick_string;
struct hstate *hstate;
unsigned long num_pages;
*user = NULL;
if (!hugetlbfs_vfsmount)
@ -937,7 +946,11 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
*user = current_user();
if (user_shm_lock(size, *user)) {
printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n");
task_lock(current);
printk_once(KERN_WARNING
"%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n",
current->comm, current->pid);
task_unlock(current);
} else {
*user = NULL;
return ERR_PTR(-EPERM);
@ -958,10 +971,12 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
if (!inode)
goto out_dentry;
hstate = hstate_inode(inode);
size += addr & ~huge_page_mask(hstate);
num_pages = ALIGN(size, huge_page_size(hstate)) >>
huge_page_shift(hstate);
error = -ENOMEM;
if (hugetlb_reserve_pages(inode, 0,
size >> huge_page_shift(hstate_inode(inode)), NULL,
acctflag))
if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag))
goto out_inode;
d_instantiate(path.dentry, inode);
@ -997,6 +1012,7 @@ static int __init init_hugetlbfs_fs(void)
if (error)
return error;
error = -ENOMEM;
hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
sizeof(struct hugetlbfs_inode_info),
0, 0, init_once);
@ -1015,10 +1031,10 @@ static int __init init_hugetlbfs_fs(void)
}
error = PTR_ERR(vfsmount);
unregister_filesystem(&hugetlbfs_fs_type);
out:
if (error)
kmem_cache_destroy(hugetlbfs_inode_cachep);
kmem_cache_destroy(hugetlbfs_inode_cachep);
out2:
bdi_destroy(&hugetlbfs_backing_dev_info);
return error;

6
fs/namei.c
View File

@ -1455,9 +1455,15 @@ done:
}
EXPORT_SYMBOL(full_name_hash);
#ifdef CONFIG_64BIT
#define ONEBYTES 0x0101010101010101ul
#define SLASHBYTES 0x2f2f2f2f2f2f2f2ful
#define HIGHBITS 0x8080808080808080ul
#else
#define ONEBYTES 0x01010101ul
#define SLASHBYTES 0x2f2f2f2ful
#define HIGHBITS 0x80808080ul
#endif
/* Return the high bit set in the first byte that is a zero */
static inline unsigned long has_zero(unsigned long a)

12
fs/proc/base.c
View File

@ -2989,9 +2989,9 @@ static const struct pid_entry tgid_base_stuff[] = {
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tgid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_maps_operations),
REG("maps", S_IRUGO, proc_pid_maps_operations),
#ifdef CONFIG_NUMA
REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
#endif
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
LNK("cwd", proc_cwd_link),
@ -3002,7 +3002,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("mountstats", S_IRUSR, proc_mountstats_operations),
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
REG("smaps", S_IRUGO, proc_smaps_operations),
REG("smaps", S_IRUGO, proc_pid_smaps_operations),
REG("pagemap", S_IRUGO, proc_pagemap_operations),
#endif
#ifdef CONFIG_SECURITY
@ -3348,9 +3348,9 @@ static const struct pid_entry tid_base_stuff[] = {
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_maps_operations),
REG("maps", S_IRUGO, proc_tid_maps_operations),
#ifdef CONFIG_NUMA
REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
#endif
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
LNK("cwd", proc_cwd_link),
@ -3360,7 +3360,7 @@ static const struct pid_entry tid_base_stuff[] = {
REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
#ifdef CONFIG_PROC_PAGE_MONITOR
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
REG("smaps", S_IRUGO, proc_smaps_operations),
REG("smaps", S_IRUGO, proc_tid_smaps_operations),
REG("pagemap", S_IRUGO, proc_pagemap_operations),
#endif
#ifdef CONFIG_SECURITY

9
fs/proc/internal.h
View File

@ -53,9 +53,12 @@ extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task);
extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
extern const struct file_operations proc_maps_operations;
extern const struct file_operations proc_numa_maps_operations;
extern const struct file_operations proc_smaps_operations;
extern const struct file_operations proc_pid_maps_operations;
extern const struct file_operations proc_tid_maps_operations;
extern const struct file_operations proc_pid_numa_maps_operations;
extern const struct file_operations proc_tid_numa_maps_operations;
extern const struct file_operations proc_pid_smaps_operations;
extern const struct file_operations proc_tid_smaps_operations;
extern const struct file_operations proc_clear_refs_operations;
extern const struct file_operations proc_pagemap_operations;
extern const struct file_operations proc_net_operations;

2
fs/proc/page.c
View File

@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page)
u |= 1 << KPF_COMPOUND_TAIL;
if (PageHuge(page))
u |= 1 << KPF_HUGE;
else if (PageTransCompound(page))
u |= 1 << KPF_THP;
/*
* Caveats on high order pages: page->_count will only be set

355
fs/proc/task_mmu.c
View File

@ -209,16 +209,20 @@ static int do_maps_open(struct inode *inode, struct file *file,
return ret;
}
static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
static void
show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
{
struct mm_struct *mm = vma->vm_mm;
struct file *file = vma->vm_file;
struct proc_maps_private *priv = m->private;
struct task_struct *task = priv->task;
vm_flags_t flags = vma->vm_flags;
unsigned long ino = 0;
unsigned long long pgoff = 0;
unsigned long start, end;
dev_t dev = 0;
int len;
const char *name = NULL;
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
@ -252,36 +256,57 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
if (file) {
pad_len_spaces(m, len);
seq_path(m, &file->f_path, "\n");
} else {
const char *name = arch_vma_name(vma);
if (!name) {
if (mm) {
if (vma->vm_start <= mm->brk &&
vma->vm_end >= mm->start_brk) {
name = "[heap]";
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
name = "[stack]";
}
goto done;
}
name = arch_vma_name(vma);
if (!name) {
pid_t tid;
if (!mm) {
name = "[vdso]";
goto done;
}
if (vma->vm_start <= mm->brk &&
vma->vm_end >= mm->start_brk) {
name = "[heap]";
goto done;
}
tid = vm_is_stack(task, vma, is_pid);
if (tid != 0) {
/*
* Thread stack in /proc/PID/task/TID/maps or
* the main process stack.
*/
if (!is_pid || (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack)) {
name = "[stack]";
} else {
name = "[vdso]";
/* Thread stack in /proc/PID/maps */
pad_len_spaces(m, len);
seq_printf(m, "[stack:%d]", tid);
}
}
if (name) {
pad_len_spaces(m, len);
seq_puts(m, name);
}
}
done:
if (name) {
pad_len_spaces(m, len);
seq_puts(m, name);
}
seq_putc(m, '\n');
}
static int show_map(struct seq_file *m, void *v)
static int show_map(struct seq_file *m, void *v, int is_pid)
{
struct vm_area_struct *vma = v;
struct proc_maps_private *priv = m->private;
struct task_struct *task = priv->task;
show_map_vma(m, vma);
show_map_vma(m, vma, is_pid);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task->mm))
@ -289,20 +314,49 @@ static int show_map(struct seq_file *m, void *v)
return 0;
}
static int show_pid_map(struct seq_file *m, void *v)
{
return show_map(m, v, 1);
}
static int show_tid_map(struct seq_file *m, void *v)
{
return show_map(m, v, 0);
}
static const struct seq_operations proc_pid_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_map
.show = show_pid_map
};
static int maps_open(struct inode *inode, struct file *file)
static const struct seq_operations proc_tid_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_tid_map
};
static int pid_maps_open(struct inode *inode, struct file *file)
{
return do_maps_open(inode, file, &proc_pid_maps_op);
}
const struct file_operations proc_maps_operations = {
.open = maps_open,
static int tid_maps_open(struct inode *inode, struct file *file)
{
return do_maps_open(inode, file, &proc_tid_maps_op);
}
const struct file_operations proc_pid_maps_operations = {
.open = pid_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
const struct file_operations proc_tid_maps_operations = {
.open = tid_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
@ -394,21 +448,15 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
pte_t *pte;
spinlock_t *ptl;
spin_lock(&walk->mm->page_table_lock);
if (pmd_trans_huge(*pmd)) {
if (pmd_trans_splitting(*pmd)) {
spin_unlock(&walk->mm->page_table_lock);
wait_split_huge_page(vma->anon_vma, pmd);
} else {
smaps_pte_entry(*(pte_t *)pmd, addr,
HPAGE_PMD_SIZE, walk);
spin_unlock(&walk->mm->page_table_lock);
mss->anonymous_thp += HPAGE_PMD_SIZE;
return 0;
}
} else {
if (pmd_trans_huge_lock(pmd, vma) == 1) {
smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk);
spin_unlock(&walk->mm->page_table_lock);
mss->anonymous_thp += HPAGE_PMD_SIZE;
return 0;
}
if (pmd_trans_unstable(pmd))
return 0;
/*
* The mmap_sem held all the way back in m_start() is what
* keeps khugepaged out of here and from collapsing things
@ -422,7 +470,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
return 0;
}
static int show_smap(struct seq_file *m, void *v)
static int show_smap(struct seq_file *m, void *v, int is_pid)
{
struct proc_maps_private *priv = m->private;
struct task_struct *task = priv->task;
@ -440,7 +488,7 @@ static int show_smap(struct seq_file *m, void *v)
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
show_map_vma(m, vma);
show_map_vma(m, vma, is_pid);
seq_printf(m,
"Size: %8lu kB\n"
@ -479,20 +527,49 @@ static int show_smap(struct seq_file *m, void *v)
return 0;
}
static int show_pid_smap(struct seq_file *m, void *v)
{
return show_smap(m, v, 1);
}
static int show_tid_smap(struct seq_file *m, void *v)
{
return show_smap(m, v, 0);
}
static const struct seq_operations proc_pid_smaps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_smap
.show = show_pid_smap
};
static int smaps_open(struct inode *inode, struct file *file)
static const struct seq_operations proc_tid_smaps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_tid_smap
};
static int pid_smaps_open(struct inode *inode, struct file *file)
{
return do_maps_open(inode, file, &proc_pid_smaps_op);
}
const struct file_operations proc_smaps_operations = {
.open = smaps_open,
static int tid_smaps_open(struct inode *inode, struct file *file)
{
return do_maps_open(inode, file, &proc_tid_smaps_op);
}
const struct file_operations proc_pid_smaps_operations = {
.open = pid_smaps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
const struct file_operations proc_tid_smaps_operations = {
.open = tid_smaps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
@ -507,6 +584,8 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
struct page *page;
split_huge_page_pmd(walk->mm, pmd);
if (pmd_trans_unstable(pmd))
return 0;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE) {
@ -598,11 +677,18 @@ const struct file_operations proc_clear_refs_operations = {
.llseek = noop_llseek,
};
typedef struct {
u64 pme;
} pagemap_entry_t;
struct pagemapread {
int pos, len;
u64 *buffer;
pagemap_entry_t *buffer;
};
#define PAGEMAP_WALK_SIZE (PMD_SIZE)
#define PAGEMAP_WALK_MASK (PMD_MASK)
#define PM_ENTRY_BYTES sizeof(u64)
#define PM_STATUS_BITS 3
#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
@ -620,10 +706,15 @@ struct pagemapread {
#define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT)
#define PM_END_OF_BUFFER 1
static int add_to_pagemap(unsigned long addr, u64 pfn,
static inline pagemap_entry_t make_pme(u64 val)
{
return (pagemap_entry_t) { .pme = val };
}
static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
struct pagemapread *pm)
{
pm->buffer[pm->pos++] = pfn;
pm->buffer[pm->pos++] = *pme;
if (pm->pos >= pm->len)
return PM_END_OF_BUFFER;
return 0;
@ -635,8 +726,10 @@ static int pagemap_pte_hole(unsigned long start, unsigned long end,
struct pagemapread *pm = walk->private;
unsigned long addr;
int err = 0;
pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
for (addr = start; addr < end; addr += PAGE_SIZE) {
err = add_to_pagemap(addr, PM_NOT_PRESENT, pm);
err = add_to_pagemap(addr, &pme, pm);
if (err)
break;
}
@ -649,18 +742,36 @@ static u64 swap_pte_to_pagemap_entry(pte_t pte)
return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT);
}
static u64 pte_to_pagemap_entry(pte_t pte)
static void pte_to_pagemap_entry(pagemap_entry_t *pme, pte_t pte)
{
u64 pme = 0;
if (is_swap_pte(pte))
pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte))
| PM_PSHIFT(PAGE_SHIFT) | PM_SWAP;
*pme = make_pme(PM_PFRAME(swap_pte_to_pagemap_entry(pte))
| PM_PSHIFT(PAGE_SHIFT) | PM_SWAP);
else if (pte_present(pte))
pme = PM_PFRAME(pte_pfn(pte))
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
return pme;
*pme = make_pme(PM_PFRAME(pte_pfn(pte))
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
pmd_t pmd, int offset)
{
/*
* Currently pmd for thp is always present because thp can not be
* swapped-out, migrated, or HWPOISONed (split in such cases instead.)
* This if-check is just to prepare for future implementation.
*/
if (pmd_present(pmd))
*pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset)
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
}
#else
static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
pmd_t pmd, int offset)
{
}
#endif
static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
@ -668,13 +779,30 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct pagemapread *pm = walk->private;
pte_t *pte;
int err = 0;
pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
split_huge_page_pmd(walk->mm, pmd);
if (pmd_trans_unstable(pmd))
return 0;
/* find the first VMA at or above 'addr' */
vma = find_vma(walk->mm, addr);
spin_lock(&walk->mm->page_table_lock);
if (pmd_trans_huge_lock(pmd, vma) == 1) {
for (; addr != end; addr += PAGE_SIZE) {
unsigned long offset;
offset = (addr & ~PAGEMAP_WALK_MASK) >>
PAGE_SHIFT;
thp_pmd_to_pagemap_entry(&pme, *pmd, offset);
err = add_to_pagemap(addr, &pme, pm);
if (err)
break;
}
spin_unlock(&walk->mm->page_table_lock);
return err;
}
for (; addr != end; addr += PAGE_SIZE) {
u64 pfn = PM_NOT_PRESENT;
/* check to see if we've left 'vma' behind
* and need a new, higher one */
@ -686,11 +814,11 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
if (vma && (vma->vm_start <= addr) &&
!is_vm_hugetlb_page(vma)) {
pte = pte_offset_map(pmd, addr);
pfn = pte_to_pagemap_entry(*pte);
pte_to_pagemap_entry(&pme, *pte);
/* unmap before userspace copy */
pte_unmap(pte);
}
err = add_to_pagemap(addr, pfn, pm);
err = add_to_pagemap(addr, &pme, pm);
if (err)
return err;
}
@ -701,13 +829,12 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
}
#ifdef CONFIG_HUGETLB_PAGE
static u64 huge_pte_to_pagemap_entry(pte_t pte, int offset)
static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme,
pte_t pte, int offset)
{
u64 pme = 0;
if (pte_present(pte))
pme = PM_PFRAME(pte_pfn(pte) + offset)
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
return pme;
*pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset)
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
}
/* This function walks within one hugetlb entry in the single call */
@ -717,12 +844,12 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
{
struct pagemapread *pm = walk->private;
int err = 0;
u64 pfn;
pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
for (; addr != end; addr += PAGE_SIZE) {
int offset = (addr & ~hmask) >> PAGE_SHIFT;
pfn = huge_pte_to_pagemap_entry(*pte, offset);
err = add_to_pagemap(addr, pfn, pm);
huge_pte_to_pagemap_entry(&pme, *pte, offset);
err = add_to_pagemap(addr, &pme, pm);
if (err)
return err;
}
@ -757,8 +884,6 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
* determine which areas of memory are actually mapped and llseek to
* skip over unmapped regions.
*/
#define PAGEMAP_WALK_SIZE (PMD_SIZE)
#define PAGEMAP_WALK_MASK (PMD_MASK)
static ssize_t pagemap_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
@ -941,26 +1066,21 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
pte_t *pte;
md = walk->private;
spin_lock(&walk->mm->page_table_lock);
if (pmd_trans_huge(*pmd)) {
if (pmd_trans_splitting(*pmd)) {
spin_unlock(&walk->mm->page_table_lock);
wait_split_huge_page(md->vma->anon_vma, pmd);
} else {
pte_t huge_pte = *(pte_t *)pmd;
struct page *page;
page = can_gather_numa_stats(huge_pte, md->vma, addr);
if (page)
gather_stats(page, md, pte_dirty(huge_pte),
HPAGE_PMD_SIZE/PAGE_SIZE);
spin_unlock(&walk->mm->page_table_lock);
return 0;
}
} else {
if (pmd_trans_huge_lock(pmd, md->vma) == 1) {
pte_t huge_pte = *(pte_t *)pmd;
struct page *page;
page = can_gather_numa_stats(huge_pte, md->vma, addr);
if (page)
gather_stats(page, md, pte_dirty(huge_pte),
HPAGE_PMD_SIZE/PAGE_SIZE);
spin_unlock(&walk->mm->page_table_lock);
return 0;
}
if (pmd_trans_unstable(pmd))
return 0;
orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
do {
struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
@ -1002,7 +1122,7 @@ static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
/*
* Display pages allocated per node and memory policy via /proc.
*/
static int show_numa_map(struct seq_file *m, void *v)
static int show_numa_map(struct seq_file *m, void *v, int is_pid)
{
struct numa_maps_private *numa_priv = m->private;
struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
@ -1039,9 +1159,19 @@ static int show_numa_map(struct seq_file *m, void *v)
seq_path(m, &file->f_path, "\n\t= ");
} else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
seq_printf(m, " heap");
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
seq_printf(m, " stack");
} else {
pid_t tid = vm_is_stack(proc_priv->task, vma, is_pid);
if (tid != 0) {
/*
* Thread stack in /proc/PID/task/TID/maps or
* the main process stack.
*/
if (!is_pid || (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack))
seq_printf(m, " stack");
else
seq_printf(m, " stack:%d", tid);
}
}
if (is_vm_hugetlb_page(vma))
@ -1084,21 +1214,39 @@ out:
return 0;
}
static int show_pid_numa_map(struct seq_file *m, void *v)
{
return show_numa_map(m, v, 1);
}
static int show_tid_numa_map(struct seq_file *m, void *v)
{
return show_numa_map(m, v, 0);
}
static const struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_numa_map,
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_pid_numa_map,
};
static int numa_maps_open(struct inode *inode, struct file *file)
static const struct seq_operations proc_tid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_tid_numa_map,
};
static int numa_maps_open(struct inode *inode, struct file *file,
const struct seq_operations *ops)
{
struct numa_maps_private *priv;
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv) {
priv->proc_maps.pid = proc_pid(inode);
ret = seq_open(file, &proc_pid_numa_maps_op);
ret = seq_open(file, ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = priv;
@ -1109,8 +1257,25 @@ static int numa_maps_open(struct inode *inode, struct file *file)
return ret;
}
const struct file_operations proc_numa_maps_operations = {
.open = numa_maps_open,
static int pid_numa_maps_open(struct inode *inode, struct file *file)
{
return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
}
static int tid_numa_maps_open(struct inode *inode, struct file *file)
{
return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
}
const struct file_operations proc_pid_numa_maps_operations = {
.open = pid_numa_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
const struct file_operations proc_tid_numa_maps_operations = {
.open = tid_numa_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,

69
fs/proc/task_nommu.c
View File

@ -134,9 +134,11 @@ static void pad_len_spaces(struct seq_file *m, int len)
/*
* display a single VMA to a sequenced file
*/
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
int is_pid)
{
struct mm_struct *mm = vma->vm_mm;
struct proc_maps_private *priv = m->private;
unsigned long ino = 0;
struct file *file;
dev_t dev = 0;
@ -168,10 +170,19 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
pad_len_spaces(m, len);
seq_path(m, &file->f_path, "");
} else if (mm) {
if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
pid_t tid = vm_is_stack(priv->task, vma, is_pid);
if (tid != 0) {
pad_len_spaces(m, len);
seq_puts(m, "[stack]");
/*
* Thread stack in /proc/PID/task/TID/maps or
* the main process stack.
*/
if (!is_pid || (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack))
seq_printf(m, "[stack]");
else
seq_printf(m, "[stack:%d]", tid);
}
}
@ -182,11 +193,22 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
/*
* display mapping lines for a particular process's /proc/pid/maps
*/
static int show_map(struct seq_file *m, void *_p)
static int show_map(struct seq_file *m, void *_p, int is_pid)
{
struct rb_node *p = _p;
return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
is_pid);
}
static int show_pid_map(struct seq_file *m, void *_p)
{
return show_map(m, _p, 1);
}
static int show_tid_map(struct seq_file *m, void *_p)
{
return show_map(m, _p, 0);
}
static void *m_start(struct seq_file *m, loff_t *pos)
@ -240,10 +262,18 @@ static const struct seq_operations proc_pid_maps_ops = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_map
.show = show_pid_map
};
static int maps_open(struct inode *inode, struct file *file)
static const struct seq_operations proc_tid_maps_ops = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_tid_map
};
static int maps_open(struct inode *inode, struct file *file,
const struct seq_operations *ops)
{
struct proc_maps_private *priv;
int ret = -ENOMEM;
@ -251,7 +281,7 @@ static int maps_open(struct inode *inode, struct file *file)
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv) {
priv->pid = proc_pid(inode);
ret = seq_open(file, &proc_pid_maps_ops);
ret = seq_open(file, ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = priv;
@ -262,8 +292,25 @@ static int maps_open(struct inode *inode, struct file *file)
return ret;
}
const struct file_operations proc_maps_operations = {
.open = maps_open,
static int pid_maps_open(struct inode *inode, struct file *file)
{
return maps_open(inode, file, &proc_pid_maps_ops);
}
static int tid_maps_open(struct inode *inode, struct file *file)
{
return maps_open(inode, file, &proc_tid_maps_ops);
}
const struct file_operations proc_pid_maps_operations = {
.open = pid_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
const struct file_operations proc_tid_maps_operations = {
.open = tid_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,

32
fs/seq_file.c
View File

@ -140,21 +140,6 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
mutex_lock(&m->lock);
/* Don't assume *ppos is where we left it */
if (unlikely(*ppos != m->read_pos)) {
m->read_pos = *ppos;
while ((err = traverse(m, *ppos)) == -EAGAIN)
;
if (err) {
/* With prejudice... */
m->read_pos = 0;
m->version = 0;
m->index = 0;
m->count = 0;
goto Done;
}
}
/*
* seq_file->op->..m_start/m_stop/m_next may do special actions
* or optimisations based on the file->f_version, so we want to
@ -167,6 +152,23 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
* need of passing another argument to all the seq_file methods.
*/
m->version = file->f_version;
/* Don't assume *ppos is where we left it */
if (unlikely(*ppos != m->read_pos)) {
while ((err = traverse(m, *ppos)) == -EAGAIN)
;
if (err) {
/* With prejudice... */
m->read_pos = 0;
m->version = 0;
m->index = 0;
m->count = 0;
goto Done;
} else {
m->read_pos = *ppos;
}
}
/* grab buffer if we didn't have one */
if (!m->buf) {
m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);

61
include/asm-generic/pgtable.h
View File

@ -425,6 +425,8 @@ extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
unsigned long size);
#endif
#ifdef CONFIG_MMU
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pmd_trans_huge(pmd_t pmd)
{
@ -441,7 +443,66 @@ static inline int pmd_write(pmd_t pmd)
return 0;
}
#endif /* __HAVE_ARCH_PMD_WRITE */
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
/*
* This function is meant to be used by sites walking pagetables with
* the mmap_sem hold in read mode to protect against MADV_DONTNEED and
* transhuge page faults. MADV_DONTNEED can convert a transhuge pmd
* into a null pmd and the transhuge page fault can convert a null pmd
* into an hugepmd or into a regular pmd (if the hugepage allocation
* fails). While holding the mmap_sem in read mode the pmd becomes
* stable and stops changing under us only if it's not null and not a
* transhuge pmd. When those races occurs and this function makes a
* difference vs the standard pmd_none_or_clear_bad, the result is
* undefined so behaving like if the pmd was none is safe (because it
* can return none anyway). The compiler level barrier() is critically
* important to compute the two checks atomically on the same pmdval.
*/
static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
{
/* depend on compiler for an atomic pmd read */
pmd_t pmdval = *pmd;
/*
* The barrier will stabilize the pmdval in a register or on
* the stack so that it will stop changing under the code.
*/
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
barrier();
#endif
if (pmd_none(pmdval))
return 1;
if (unlikely(pmd_bad(pmdval))) {
if (!pmd_trans_huge(pmdval))
pmd_clear_bad(pmd);
return 1;
}
return 0;
}
/*
* This is a noop if Transparent Hugepage Support is not built into
* the kernel. Otherwise it is equivalent to
* pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in
* places that already verified the pmd is not none and they want to
* walk ptes while holding the mmap sem in read mode (write mode don't
* need this). If THP is not enabled, the pmd can't go away under the
* code even if MADV_DONTNEED runs, but if THP is enabled we need to
* run a pmd_trans_unstable before walking the ptes after
* split_huge_page_pmd returns (because it may have run when the pmd
* become null, but then a page fault can map in a THP and not a
* regular page).
*/
static inline int pmd_trans_unstable(pmd_t *pmd)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
return pmd_none_or_trans_huge_or_clear_bad(pmd);
#else
return 0;
#endif
}
#endif /* CONFIG_MMU */
#endif /* !__ASSEMBLY__ */

2
include/linux/cgroup.h
View File

@ -498,7 +498,7 @@ struct cgroup_subsys {
struct list_head sibling;
/* used when use_id == true */
struct idr idr;
rwlock_t id_lock;
spinlock_t id_lock;
/* should be defined only by modular subsystems */
struct module *module;

20
include/linux/compaction.h
View File

@ -23,6 +23,7 @@ extern int fragmentation_index(struct zone *zone, unsigned int order);
extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
int order, gfp_t gfp_mask, nodemask_t *mask,
bool sync);
extern int compact_pgdat(pg_data_t *pgdat, int order);
extern unsigned long compaction_suitable(struct zone *zone, int order);
/* Do not skip compaction more than 64 times */
@ -33,20 +34,26 @@ extern unsigned long compaction_suitable(struct zone *zone, int order);
* allocation success. 1 << compact_defer_limit compactions are skipped up
* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
*/
static inline void defer_compaction(struct zone *zone)
static inline void defer_compaction(struct zone *zone, int order)
{
zone->compact_considered = 0;
zone->compact_defer_shift++;
if (order < zone->compact_order_failed)
zone->compact_order_failed = order;
if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
}
/* Returns true if compaction should be skipped this time */
static inline bool compaction_deferred(struct zone *zone)
static inline bool compaction_deferred(struct zone *zone, int order)
{
unsigned long defer_limit = 1UL << zone->compact_defer_shift;
if (order < zone->compact_order_failed)
return false;
/* Avoid possible overflow */
if (++zone->compact_considered > defer_limit)
zone->compact_considered = defer_limit;
@ -62,16 +69,21 @@ static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
return COMPACT_CONTINUE;
}
static inline int compact_pgdat(pg_data_t *pgdat, int order)
{
return COMPACT_CONTINUE;
}
static inline unsigned long compaction_suitable(struct zone *zone, int order)
{
return COMPACT_SKIPPED;
}
static inline void defer_compaction(struct zone *zone)
static inline void defer_compaction(struct zone *zone, int order)
{
}
static inline bool compaction_deferred(struct zone *zone)
static inline bool compaction_deferred(struct zone *zone, int order)
{
return 1;
}

47
include/linux/cpuset.h
View File

@ -89,42 +89,33 @@ extern void rebuild_sched_domains(void);
extern void cpuset_print_task_mems_allowed(struct task_struct *p);
/*
* reading current mems_allowed and mempolicy in the fastpath must protected
* by get_mems_allowed()
* get_mems_allowed is required when making decisions involving mems_allowed
* such as during page allocation. mems_allowed can be updated in parallel
* and depending on the new value an operation can fail potentially causing
* process failure. A retry loop with get_mems_allowed and put_mems_allowed
* prevents these artificial failures.
*/
static inline void get_mems_allowed(void)
static inline unsigned int get_mems_allowed(void)
{
current->mems_allowed_change_disable++;
/*
* ensure that reading mems_allowed and mempolicy happens after the
* update of ->mems_allowed_change_disable.
*
* the write-side task finds ->mems_allowed_change_disable is not 0,
* and knows the read-side task is reading mems_allowed or mempolicy,
* so it will clear old bits lazily.
*/
smp_mb();
return read_seqcount_begin(&current->mems_allowed_seq);
}
static inline void put_mems_allowed(void)
/*
* If this returns false, the operation that took place after get_mems_allowed
* may have failed. It is up to the caller to retry the operation if
* appropriate.
*/
static inline bool put_mems_allowed(unsigned int seq)
{
/*
* ensure that reading mems_allowed and mempolicy before reducing
* mems_allowed_change_disable.
*
* the write-side task will know that the read-side task is still
* reading mems_allowed or mempolicy, don't clears old bits in the
* nodemask.
*/
smp_mb();
--ACCESS_ONCE(current->mems_allowed_change_disable);
return !read_seqcount_retry(&current->mems_allowed_seq, seq);
}
static inline void set_mems_allowed(nodemask_t nodemask)
{
task_lock(current);
write_seqcount_begin(&current->mems_allowed_seq);
current->mems_allowed = nodemask;
write_seqcount_end(&current->mems_allowed_seq);
task_unlock(current);
}
@ -234,12 +225,14 @@ static inline void set_mems_allowed(nodemask_t nodemask)
{
}
static inline void get_mems_allowed(void)
static inline unsigned int get_mems_allowed(void)
{
return 0;
}
static inline void put_mems_allowed(void)
static inline bool put_mems_allowed(unsigned int seq)
{
return true;
}
#endif /* !CONFIG_CPUSETS */

28
include/linux/huge_mm.h
View File

@ -51,6 +51,9 @@ extern pmd_t *page_check_address_pmd(struct page *page,
unsigned long address,
enum page_check_address_pmd_flag flag);
#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define HPAGE_PMD_SHIFT HPAGE_SHIFT
#define HPAGE_PMD_MASK HPAGE_MASK
@ -102,8 +105,6 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
BUG_ON(pmd_trans_splitting(*____pmd) || \
pmd_trans_huge(*____pmd)); \
} while (0)
#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
#if HPAGE_PMD_ORDER > MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
@ -113,6 +114,18 @@ extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
long adjust_next);
extern int __pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma);
/* mmap_sem must be held on entry */
static inline int pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
{
VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
if (pmd_trans_huge(*pmd))
return __pmd_trans_huge_lock(pmd, vma);
else
return 0;
}
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
@ -146,9 +159,9 @@ static inline struct page *compound_trans_head(struct page *page)
return page;
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUG(); 0; })
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
#define hpage_nr_pages(x) 1
@ -176,6 +189,11 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
long adjust_next)
{
}
static inline int pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
{
return 0;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif /* _LINUX_HUGE_MM_H */

45
include/linux/hugetlb.h
View File

@ -14,6 +14,15 @@ struct user_struct;
#include <linux/shm.h>
#include <asm/tlbflush.h>
struct hugepage_subpool {
spinlock_t lock;
long count;
long max_hpages, used_hpages;
};
struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);
int PageHuge(struct page *page);
void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
@ -128,35 +137,14 @@ enum {
};
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_config {
uid_t uid;
gid_t gid;
umode_t mode;
long nr_blocks;
long nr_inodes;
struct hstate *hstate;
};
struct hugetlbfs_sb_info {
long max_blocks; /* blocks allowed */
long free_blocks; /* blocks free */
long max_inodes; /* inodes allowed */
long free_inodes; /* inodes free */
spinlock_t stat_lock;
struct hstate *hstate;
struct hugepage_subpool *spool;
};
struct hugetlbfs_inode_info {
struct shared_policy policy;
struct inode vfs_inode;
};
static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}
static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
@ -164,10 +152,9 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
size_t size, vm_flags_t acct,
struct user_struct **user, int creat_flags);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);
static inline int is_file_hugepages(struct file *file)
{
@ -179,15 +166,11 @@ static inline int is_file_hugepages(struct file *file)
return 0;
}
static inline void set_file_hugepages(struct file *file)
{
file->f_op = &hugetlbfs_file_operations;
}
#else /* !CONFIG_HUGETLBFS */
#define is_file_hugepages(file) 0
#define set_file_hugepages(file) BUG()
static inline struct file *hugetlb_file_setup(const char *name, size_t size,
static inline struct file *
hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
vm_flags_t acctflag, struct user_struct **user, int creat_flags)
{
return ERR_PTR(-ENOSYS);

8
include/linux/init_task.h
View File

@ -29,6 +29,13 @@ extern struct fs_struct init_fs;
#define INIT_GROUP_RWSEM(sig)
#endif
#ifdef CONFIG_CPUSETS
#define INIT_CPUSET_SEQ \
.mems_allowed_seq = SEQCNT_ZERO,
#else
#define INIT_CPUSET_SEQ
#endif
#define INIT_SIGNALS(sig) { \
.nr_threads = 1, \
.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
@ -192,6 +199,7 @@ extern struct cred init_cred;
INIT_FTRACE_GRAPH \
INIT_TRACE_RECURSION \
INIT_TASK_RCU_PREEMPT(tsk) \
INIT_CPUSET_SEQ \
}

1
include/linux/kernel-page-flags.h
View File

@ -30,6 +30,7 @@
#define KPF_NOPAGE 20
#define KPF_KSM 21
#define KPF_THP 22
/* kernel hacking assistances
* WARNING: subject to change, never rely on them!

58
include/linux/memcontrol.h
View File

@ -77,7 +77,8 @@ extern void mem_cgroup_uncharge_end(void);
extern void mem_cgroup_uncharge_page(struct page *page);
extern void mem_cgroup_uncharge_cache_page(struct page *page);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
int order);
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);
extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
@ -140,6 +141,34 @@ static inline bool mem_cgroup_disabled(void)
return false;
}
void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
unsigned long *flags);
extern atomic_t memcg_moving;
static inline void mem_cgroup_begin_update_page_stat(struct page *page,
bool *locked, unsigned long *flags)
{
if (mem_cgroup_disabled())
return;
rcu_read_lock();
*locked = false;
if (atomic_read(&memcg_moving))
__mem_cgroup_begin_update_page_stat(page, locked, flags);
}
void __mem_cgroup_end_update_page_stat(struct page *page,
unsigned long *flags);
static inline void mem_cgroup_end_update_page_stat(struct page *page,
bool *locked, unsigned long *flags)
{
if (mem_cgroup_disabled())
return;
if (*locked)
__mem_cgroup_end_update_page_stat(page, flags);
rcu_read_unlock();
}
void mem_cgroup_update_page_stat(struct page *page,
enum mem_cgroup_page_stat_item idx,
int val);
@ -298,21 +327,6 @@ static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
{
}
static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
{
return 0;
}
static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
int priority)
{
}
static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
int priority)
{
}
static inline bool mem_cgroup_disabled(void)
{
return true;
@ -355,6 +369,16 @@ mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
}
static inline void mem_cgroup_begin_update_page_stat(struct page *page,
bool *locked, unsigned long *flags)
{
}
static inline void mem_cgroup_end_update_page_stat(struct page *page,
bool *locked, unsigned long *flags)
{
}
static inline void mem_cgroup_inc_page_stat(struct page *page,
enum mem_cgroup_page_stat_item idx)
{
@ -391,7 +415,7 @@ static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
struct page *newpage)
{
}
#endif /* CONFIG_CGROUP_MEM_CONT */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
static inline bool

2
include/linux/migrate.h
View File

@ -8,7 +8,6 @@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
#ifdef CONFIG_MIGRATION
#define PAGE_MIGRATION 1
extern void putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
@ -32,7 +31,6 @@ extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page);
#else
#define PAGE_MIGRATION 0
static inline void putback_lru_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t x,

30
include/linux/mm.h
View File

@ -1040,6 +1040,9 @@ static inline int stack_guard_page_end(struct vm_area_struct *vma,
!vma_growsup(vma->vm_next, addr);
}
extern pid_t
vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);
extern unsigned long move_page_tables(struct vm_area_struct *vma,
unsigned long old_addr, struct vm_area_struct *new_vma,
unsigned long new_addr, unsigned long len);
@ -1058,19 +1061,20 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
/*
* per-process(per-mm_struct) statistics.
*/
static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
{
atomic_long_set(&mm->rss_stat.count[member], value);
}
#if defined(SPLIT_RSS_COUNTING)
unsigned long get_mm_counter(struct mm_struct *mm, int member);
#else
static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
{
return atomic_long_read(&mm->rss_stat.count[member]);
}
long val = atomic_long_read(&mm->rss_stat.count[member]);
#ifdef SPLIT_RSS_COUNTING
/*
* counter is updated in asynchronous manner and may go to minus.
* But it's never be expected number for users.
*/
if (val < 0)
val = 0;
#endif
return (unsigned long)val;
}
static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
{
@ -1127,9 +1131,9 @@ static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
}
#if defined(SPLIT_RSS_COUNTING)
void sync_mm_rss(struct task_struct *task, struct mm_struct *mm);
void sync_mm_rss(struct mm_struct *mm);
#else
static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
static inline void sync_mm_rss(struct mm_struct *mm)
{
}
#endif
@ -1291,8 +1295,6 @@ extern void get_pfn_range_for_nid(unsigned int nid,
extern unsigned long find_min_pfn_with_active_regions(void);
extern void free_bootmem_with_active_regions(int nid,
unsigned long max_low_pfn);
int add_from_early_node_map(struct range *range, int az,
int nr_range, int nid);
extern void sparse_memory_present_with_active_regions(int nid);
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */

1
include/linux/mmzone.h
View File

@ -365,6 +365,7 @@ struct zone {
*/
unsigned int compact_considered;
unsigned int compact_defer_shift;
int compact_order_failed;
#endif
ZONE_PADDING(_pad1_)

2
include/linux/oom.h
View File

@ -49,7 +49,7 @@ extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *mask);
int order, nodemask_t *mask, bool force_kill);
extern int register_oom_notifier(struct notifier_block *nb);
extern int unregister_oom_notifier(struct notifier_block *nb);

20
include/linux/page-flags.h
View File

@ -414,11 +414,26 @@ static inline int PageTransHuge(struct page *page)
return PageHead(page);
}
/*
* PageTransCompound returns true for both transparent huge pages
* and hugetlbfs pages, so it should only be called when it's known
* that hugetlbfs pages aren't involved.
*/
static inline int PageTransCompound(struct page *page)
{
return PageCompound(page);
}
/*
* PageTransTail returns true for both transparent huge pages
* and hugetlbfs pages, so it should only be called when it's known
* that hugetlbfs pages aren't involved.
*/
static inline int PageTransTail(struct page *page)
{
return PageTail(page);
}
#else
static inline int PageTransHuge(struct page *page)
@ -430,6 +445,11 @@ static inline int PageTransCompound(struct page *page)
{
return 0;
}
static inline int PageTransTail(struct page *page)
{
return 0;
}
#endif
#ifdef CONFIG_MMU

33
include/linux/page_cgroup.h
View File

@ -4,12 +4,8 @@
enum {
/* flags for mem_cgroup */
PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
PCG_CACHE, /* charged as cache */
PCG_USED, /* this object is in use. */
PCG_MIGRATION, /* under page migration */
/* flags for mem_cgroup and file and I/O status */
PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */
PCG_FILE_MAPPED, /* page is accounted as "mapped" */
__NR_PCG_FLAGS,
};
@ -64,19 +60,10 @@ static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
static inline int TestClearPageCgroup##uname(struct page_cgroup *pc) \
{ return test_and_clear_bit(PCG_##lname, &pc->flags); }
/* Cache flag is set only once (at allocation) */
TESTPCGFLAG(Cache, CACHE)
CLEARPCGFLAG(Cache, CACHE)
SETPCGFLAG(Cache, CACHE)
TESTPCGFLAG(Used, USED)
CLEARPCGFLAG(Used, USED)
SETPCGFLAG(Used, USED)
SETPCGFLAG(FileMapped, FILE_MAPPED)
CLEARPCGFLAG(FileMapped, FILE_MAPPED)
TESTPCGFLAG(FileMapped, FILE_MAPPED)
SETPCGFLAG(Migration, MIGRATION)
CLEARPCGFLAG(Migration, MIGRATION)
TESTPCGFLAG(Migration, MIGRATION)
@ -85,7 +72,7 @@ static inline void lock_page_cgroup(struct page_cgroup *pc)
{
/*
* Don't take this lock in IRQ context.
* This lock is for pc->mem_cgroup, USED, CACHE, MIGRATION
* This lock is for pc->mem_cgroup, USED, MIGRATION
*/
bit_spin_lock(PCG_LOCK, &pc->flags);
}
@ -95,24 +82,6 @@ static inline void unlock_page_cgroup(struct page_cgroup *pc)
bit_spin_unlock(PCG_LOCK, &pc->flags);
}
static inline void move_lock_page_cgroup(struct page_cgroup *pc,
unsigned long *flags)
{
/*
* We know updates to pc->flags of page cache's stats are from both of
* usual context or IRQ context. Disable IRQ to avoid deadlock.
*/
local_irq_save(*flags);
bit_spin_lock(PCG_MOVE_LOCK, &pc->flags);
}
static inline void move_unlock_page_cgroup(struct page_cgroup *pc,
unsigned long *flags)
{
bit_spin_unlock(PCG_MOVE_LOCK, &pc->flags);
local_irq_restore(*flags);
}
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct page_cgroup;

1
include/linux/rmap.h
View File

@ -122,7 +122,6 @@ void unlink_anon_vmas(struct vm_area_struct *);
int anon_vma_clone(struct vm_area_struct *, struct vm_area_struct *);
void anon_vma_moveto_tail(struct vm_area_struct *);
int anon_vma_fork(struct vm_area_struct *, struct vm_area_struct *);
void __anon_vma_link(struct vm_area_struct *);
static inline void anon_vma_merge(struct vm_area_struct *vma,
struct vm_area_struct *next)

2
include/linux/sched.h
View File

@ -1514,7 +1514,7 @@ struct task_struct {
#endif
#ifdef CONFIG_CPUSETS
nodemask_t mems_allowed; /* Protected by alloc_lock */
int mems_allowed_change_disable;
seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
int cpuset_mem_spread_rotor;
int cpuset_slab_spread_rotor;
#endif

2
include/linux/swap.h
View File

@ -223,6 +223,7 @@ extern void lru_add_page_tail(struct zone* zone,
extern void activate_page(struct page *);
extern void mark_page_accessed(struct page *);
extern void lru_add_drain(void);
extern void lru_add_drain_cpu(int cpu);
extern int lru_add_drain_all(void);
extern void rotate_reclaimable_page(struct page *page);
extern void deactivate_page(struct page *page);
@ -329,7 +330,6 @@ extern long total_swap_pages;
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(void);
extern swp_entry_t get_swap_page_of_type(int);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
extern int add_swap_count_continuation(swp_entry_t, gfp_t);
extern void swap_shmem_alloc(swp_entry_t);
extern int swap_duplicate(swp_entry_t);

2
ipc/shm.c
View File

@ -482,7 +482,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
/* hugetlb_file_setup applies strict accounting */
if (shmflg & SHM_NORESERVE)
acctflag = VM_NORESERVE;
file = hugetlb_file_setup(name, size, acctflag,
file = hugetlb_file_setup(name, 0, size, acctflag,
&shp->mlock_user, HUGETLB_SHMFS_INODE);
} else {
/*

19
kernel/cgroup.c
View File

@ -4881,9 +4881,9 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
rcu_assign_pointer(id->css, NULL);
rcu_assign_pointer(css->id, NULL);
write_lock(&ss->id_lock);
spin_lock(&ss->id_lock);
idr_remove(&ss->idr, id->id);
write_unlock(&ss->id_lock);
spin_unlock(&ss->id_lock);
kfree_rcu(id, rcu_head);
}
EXPORT_SYMBOL_GPL(free_css_id);
@ -4909,10 +4909,10 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
error = -ENOMEM;
goto err_out;
}
write_lock(&ss->id_lock);
spin_lock(&ss->id_lock);
/* Don't use 0. allocates an ID of 1-65535 */
error = idr_get_new_above(&ss->idr, newid, 1, &myid);
write_unlock(&ss->id_lock);
spin_unlock(&ss->id_lock);
/* Returns error when there are no free spaces for new ID.*/
if (error) {
@ -4927,9 +4927,9 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
return newid;
remove_idr:
error = -ENOSPC;
write_lock(&ss->id_lock);
spin_lock(&ss->id_lock);
idr_remove(&ss->idr, myid);
write_unlock(&ss->id_lock);
spin_unlock(&ss->id_lock);
err_out:
kfree(newid);
return ERR_PTR(error);
@ -4941,7 +4941,7 @@ static int __init_or_module cgroup_init_idr(struct cgroup_subsys *ss,
{
struct css_id *newid;
rwlock_init(&ss->id_lock);
spin_lock_init(&ss->id_lock);
idr_init(&ss->idr);
newid = get_new_cssid(ss, 0);
@ -5029,6 +5029,8 @@ css_get_next(struct cgroup_subsys *ss, int id,
return NULL;
BUG_ON(!ss->use_id);
WARN_ON_ONCE(!rcu_read_lock_held());
/* fill start point for scan */
tmpid = id;
while (1) {
@ -5036,10 +5038,7 @@ css_get_next(struct cgroup_subsys *ss, int id,
* scan next entry from bitmap(tree), tmpid is updated after
* idr_get_next().
*/
read_lock(&ss->id_lock);
tmp = idr_get_next(&ss->idr, &tmpid);
read_unlock(&ss->id_lock);
if (!tmp)
break;
if (tmp->depth >= depth && tmp->stack[depth] == rootid) {

43
kernel/cpuset.c
View File

@ -964,7 +964,6 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
{
bool need_loop;
repeat:
/*
* Allow tasks that have access to memory reserves because they have
* been OOM killed to get memory anywhere.
@ -983,45 +982,19 @@ repeat:
*/
need_loop = task_has_mempolicy(tsk) ||
!nodes_intersects(*newmems, tsk->mems_allowed);
if (need_loop)
write_seqcount_begin(&tsk->mems_allowed_seq);
nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP1);
/*
* ensure checking ->mems_allowed_change_disable after setting all new
* allowed nodes.
*
* the read-side task can see an nodemask with new allowed nodes and
* old allowed nodes. and if it allocates page when cpuset clears newly
* disallowed ones continuous, it can see the new allowed bits.
*
* And if setting all new allowed nodes is after the checking, setting
* all new allowed nodes and clearing newly disallowed ones will be done
* continuous, and the read-side task may find no node to alloc page.
*/
smp_mb();
/*
* Allocation of memory is very fast, we needn't sleep when waiting
* for the read-side.
*/
while (need_loop && ACCESS_ONCE(tsk->mems_allowed_change_disable)) {
task_unlock(tsk);
if (!task_curr(tsk))
yield();
goto repeat;
}
/*
* ensure checking ->mems_allowed_change_disable before clearing all new
* disallowed nodes.
*
* if clearing newly disallowed bits before the checking, the read-side
* task may find no node to alloc page.
*/
smp_mb();
mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP2);
tsk->mems_allowed = *newmems;
if (need_loop)
write_seqcount_end(&tsk->mems_allowed_seq);
task_unlock(tsk);
}

2
kernel/exit.c
View File

@ -935,7 +935,7 @@ void do_exit(long code)
acct_update_integrals(tsk);
/* sync mm's RSS info before statistics gathering */
if (tsk->mm)
sync_mm_rss(tsk, tsk->mm);
sync_mm_rss(tsk->mm);
group_dead = atomic_dec_and_test(&tsk->signal->live);
if (group_dead) {
hrtimer_cancel(&tsk->signal->real_timer);

22
kernel/fork.c
View File

@ -512,6 +512,23 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
return NULL;
}
static void check_mm(struct mm_struct *mm)
{
int i;
for (i = 0; i < NR_MM_COUNTERS; i++) {
long x = atomic_long_read(&mm->rss_stat.count[i]);
if (unlikely(x))
printk(KERN_ALERT "BUG: Bad rss-counter state "
"mm:%p idx:%d val:%ld\n", mm, i, x);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
VM_BUG_ON(mm->pmd_huge_pte);
#endif
}
/*
* Allocate and initialize an mm_struct.
*/
@ -539,9 +556,7 @@ void __mmdrop(struct mm_struct *mm)
mm_free_pgd(mm);
destroy_context(mm);
mmu_notifier_mm_destroy(mm);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
VM_BUG_ON(mm->pmd_huge_pte);
#endif
check_mm(mm);
free_mm(mm);
}
EXPORT_SYMBOL_GPL(__mmdrop);
@ -1223,6 +1238,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
#ifdef CONFIG_CPUSETS
p->cpuset_mem_spread_rotor = NUMA_NO_NODE;
p->cpuset_slab_spread_rotor = NUMA_NO_NODE;
seqcount_init(&p->mems_allowed_seq);
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
p->irq_events = 0;

8
lib/idr.c
View File

@ -595,8 +595,10 @@ EXPORT_SYMBOL(idr_for_each);
* Returns pointer to registered object with id, which is next number to
* given id. After being looked up, *@nextidp will be updated for the next
* iteration.
*
* This function can be called under rcu_read_lock(), given that the leaf
* pointers lifetimes are correctly managed.
*/
void *idr_get_next(struct idr *idp, int *nextidp)
{
struct idr_layer *p, *pa[MAX_LEVEL];
@ -605,11 +607,11 @@ void *idr_get_next(struct idr *idp, int *nextidp)
int n, max;
/* find first ent */
n = idp->layers * IDR_BITS;
max = 1 << n;
p = rcu_dereference_raw(idp->top);
if (!p)
return NULL;
n = (p->layer + 1) * IDR_BITS;
max = 1 << n;
while (id < max) {
while (n > 0 && p) {

5
mm/bootmem.c
View File

@ -766,14 +766,13 @@ void * __init alloc_bootmem_section(unsigned long size,
unsigned long section_nr)
{
bootmem_data_t *bdata;
unsigned long pfn, goal, limit;
unsigned long pfn, goal;
pfn = section_nr_to_pfn(section_nr);
goal = pfn << PAGE_SHIFT;
limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];
return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, 0);
}
#endif

75
mm/compaction.c
View File

@ -35,7 +35,7 @@ struct compact_control {
unsigned long migrate_pfn; /* isolate_migratepages search base */
bool sync; /* Synchronous migration */
unsigned int order; /* order a direct compactor needs */
int order; /* order a direct compactor needs */
int migratetype; /* MOVABLE, RECLAIMABLE etc */
struct zone *zone;
};
@ -675,49 +675,71 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
/* Compact all zones within a node */
static int compact_node(int nid)
static int __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
{
int zoneid;
pg_data_t *pgdat;
struct zone *zone;
if (nid < 0 || nid >= nr_node_ids || !node_online(nid))
return -EINVAL;
pgdat = NODE_DATA(nid);
/* Flush pending updates to the LRU lists */
lru_add_drain_all();
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
struct compact_control cc = {
.nr_freepages = 0,
.nr_migratepages = 0,
.order = -1,
.sync = true,
};
zone = &pgdat->node_zones[zoneid];
if (!populated_zone(zone))
continue;
cc.zone = zone;
INIT_LIST_HEAD(&cc.freepages);
INIT_LIST_HEAD(&cc.migratepages);
cc->nr_freepages = 0;
cc->nr_migratepages = 0;
cc->zone = zone;
INIT_LIST_HEAD(&cc->freepages);
INIT_LIST_HEAD(&cc->migratepages);
compact_zone(zone, &cc);
if (cc->order == -1 || !compaction_deferred(zone, cc->order))
compact_zone(zone, cc);
VM_BUG_ON(!list_empty(&cc.freepages));
VM_BUG_ON(!list_empty(&cc.migratepages));
if (cc->order > 0) {
int ok = zone_watermark_ok(zone, cc->order,
low_wmark_pages(zone), 0, 0);
if (ok && cc->order > zone->compact_order_failed)
zone->compact_order_failed = cc->order + 1;
/* Currently async compaction is never deferred. */
else if (!ok && cc->sync)
defer_compaction(zone, cc->order);
}
VM_BUG_ON(!list_empty(&cc->freepages));
VM_BUG_ON(!list_empty(&cc->migratepages));
}
return 0;
}
int compact_pgdat(pg_data_t *pgdat, int order)
{
struct compact_control cc = {
.order = order,
.sync = false,
};
return __compact_pgdat(pgdat, &cc);
}
static int compact_node(int nid)
{
struct compact_control cc = {
.order = -1,
.sync = true,
};
return __compact_pgdat(NODE_DATA(nid), &cc);
}
/* Compact all nodes in the system */
static int compact_nodes(void)
{
int nid;
/* Flush pending updates to the LRU lists */
lru_add_drain_all();
for_each_online_node(nid)
compact_node(nid);
@ -750,7 +772,14 @@ ssize_t sysfs_compact_node(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
compact_node(dev->id);
int nid = dev->id;
if (nid >= 0 && nid < nr_node_ids && node_online(nid)) {
/* Flush pending updates to the LRU lists */
lru_add_drain_all();
compact_node(nid);
}
return count;
}

20
mm/filemap.c
View File

@ -101,9 +101,8 @@
* ->inode->i_lock (zap_pte_range->set_page_dirty)
* ->private_lock (zap_pte_range->__set_page_dirty_buffers)
*
* (code doesn't rely on that order, so you could switch it around)
* ->tasklist_lock (memory_failure, collect_procs_ao)
* ->i_mmap_mutex
* ->i_mmap_mutex
* ->tasklist_lock (memory_failure, collect_procs_ao)
*/
/*
@ -500,10 +499,13 @@ struct page *__page_cache_alloc(gfp_t gfp)
struct page *page;
if (cpuset_do_page_mem_spread()) {
get_mems_allowed();
n = cpuset_mem_spread_node();
page = alloc_pages_exact_node(n, gfp, 0);
put_mems_allowed();
unsigned int cpuset_mems_cookie;
do {
cpuset_mems_cookie = get_mems_allowed();
n = cpuset_mem_spread_node();
page = alloc_pages_exact_node(n, gfp, 0);
} while (!put_mems_allowed(cpuset_mems_cookie) && !page);
return page;
}
return alloc_pages(gfp, 0);
@ -2341,7 +2343,9 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
struct page *page;
gfp_t gfp_notmask = 0;
gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
gfp_mask = mapping_gfp_mask(mapping);
if (mapping_cap_account_dirty(mapping))
gfp_mask |= __GFP_WRITE;
if (flags & AOP_FLAG_NOFS)
gfp_notmask = __GFP_FS;
repeat:

129
mm/huge_memory.c
View File

@ -1031,32 +1031,23 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
{
int ret = 0;
spin_lock(&tlb->mm->page_table_lock);
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
spin_unlock(&tlb->mm->page_table_lock);
wait_split_huge_page(vma->anon_vma,
pmd);
} else {
struct page *page;
pgtable_t pgtable;
pgtable = get_pmd_huge_pte(tlb->mm);
page = pmd_page(*pmd);
pmd_clear(pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
page_remove_rmap(page);
VM_BUG_ON(page_mapcount(page) < 0);
add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
VM_BUG_ON(!PageHead(page));
tlb->mm->nr_ptes--;
spin_unlock(&tlb->mm->page_table_lock);
tlb_remove_page(tlb, page);
pte_free(tlb->mm, pgtable);
ret = 1;
}
} else
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
struct page *page;
pgtable_t pgtable;
pgtable = get_pmd_huge_pte(tlb->mm);
page = pmd_page(*pmd);
pmd_clear(pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
page_remove_rmap(page);
VM_BUG_ON(page_mapcount(page) < 0);
add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
VM_BUG_ON(!PageHead(page));
tlb->mm->nr_ptes--;
spin_unlock(&tlb->mm->page_table_lock);
tlb_remove_page(tlb, page);
pte_free(tlb->mm, pgtable);
ret = 1;
}
return ret;
}
@ -1066,21 +1057,15 @@ int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
{
int ret = 0;
spin_lock(&vma->vm_mm->page_table_lock);
if (likely(pmd_trans_huge(*pmd))) {
ret = !pmd_trans_splitting(*pmd);
spin_unlock(&vma->vm_mm->page_table_lock);
if (unlikely(!ret))
wait_split_huge_page(vma->anon_vma, pmd);
else {
/*
* All logical pages in the range are present
* if backed by a huge page.
*/
memset(vec, 1, (end - addr) >> PAGE_SHIFT);
}
} else
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
/*
* All logical pages in the range are present
* if backed by a huge page.
*/
spin_unlock(&vma->vm_mm->page_table_lock);
memset(vec, 1, (end - addr) >> PAGE_SHIFT);
ret = 1;
}
return ret;
}
@ -1110,20 +1095,11 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
goto out;
}
spin_lock(&mm->page_table_lock);
if (likely(pmd_trans_huge(*old_pmd))) {
if (pmd_trans_splitting(*old_pmd)) {
spin_unlock(&mm->page_table_lock);
wait_split_huge_page(vma->anon_vma, old_pmd);
ret = -1;
} else {
pmd = pmdp_get_and_clear(mm, old_addr, old_pmd);
VM_BUG_ON(!pmd_none(*new_pmd));
set_pmd_at(mm, new_addr, new_pmd, pmd);
spin_unlock(&mm->page_table_lock);
ret = 1;
}
} else {
ret = __pmd_trans_huge_lock(old_pmd, vma);
if (ret == 1) {
pmd = pmdp_get_and_clear(mm, old_addr, old_pmd);
VM_BUG_ON(!pmd_none(*new_pmd));
set_pmd_at(mm, new_addr, new_pmd, pmd);
spin_unlock(&mm->page_table_lock);
}
out:
@ -1136,26 +1112,43 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
struct mm_struct *mm = vma->vm_mm;
int ret = 0;
spin_lock(&mm->page_table_lock);
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
spin_unlock(&mm->page_table_lock);
wait_split_huge_page(vma->anon_vma, pmd);
} else {
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
entry = pmd_modify(entry, newprot);
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;
}
} else
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
entry = pmd_modify(entry, newprot);
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;
}
return ret;
}
/*
* Returns 1 if a given pmd maps a stable (not under splitting) thp.
* Returns -1 if it maps a thp under splitting. Returns 0 otherwise.
*
* Note that if it returns 1, this routine returns without unlocking page
* table locks. So callers must unlock them.
*/
int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
{
spin_lock(&vma->vm_mm->page_table_lock);
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
spin_unlock(&vma->vm_mm->page_table_lock);
wait_split_huge_page(vma->anon_vma, pmd);
return -1;
} else {
/* Thp mapped by 'pmd' is stable, so we can
* handle it as it is. */
return 1;
}
}
spin_unlock(&vma->vm_mm->page_table_lock);
return 0;
}
pmd_t *page_check_address_pmd(struct page *page,
struct mm_struct *mm,
unsigned long address,

184
mm/hugetlb.c
View File

@ -53,6 +53,84 @@ static unsigned long __initdata default_hstate_size;
*/
static DEFINE_SPINLOCK(hugetlb_lock);
static inline void unlock_or_release_subpool(struct hugepage_subpool *spool)
{
bool free = (spool->count == 0) && (spool->used_hpages == 0);
spin_unlock(&spool->lock);
/* If no pages are used, and no other handles to the subpool
* remain, free the subpool the subpool remain */
if (free)
kfree(spool);
}
struct hugepage_subpool *hugepage_new_subpool(long nr_blocks)
{
struct hugepage_subpool *spool;
spool = kmalloc(sizeof(*spool), GFP_KERNEL);
if (!spool)
return NULL;
spin_lock_init(&spool->lock);
spool->count = 1;
spool->max_hpages = nr_blocks;
spool->used_hpages = 0;
return spool;
}
void hugepage_put_subpool(struct hugepage_subpool *spool)
{
spin_lock(&spool->lock);
BUG_ON(!spool->count);
spool->count--;
unlock_or_release_subpool(spool);
}
static int hugepage_subpool_get_pages(struct hugepage_subpool *spool,
long delta)
{
int ret = 0;
if (!spool)
return 0;
spin_lock(&spool->lock);
if ((spool->used_hpages + delta) <= spool->max_hpages) {
spool->used_hpages += delta;
} else {
ret = -ENOMEM;
}
spin_unlock(&spool->lock);
return ret;
}
static void hugepage_subpool_put_pages(struct hugepage_subpool *spool,
long delta)
{
if (!spool)
return;
spin_lock(&spool->lock);
spool->used_hpages -= delta;
/* If hugetlbfs_put_super couldn't free spool due to
* an outstanding quota reference, free it now. */
unlock_or_release_subpool(spool);
}
static inline struct hugepage_subpool *subpool_inode(struct inode *inode)
{
return HUGETLBFS_SB(inode->i_sb)->spool;
}
static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma)
{
return subpool_inode(vma->vm_file->f_dentry->d_inode);
}
/*
* Region tracking -- allows tracking of reservations and instantiated pages
* across the pages in a mapping.
@ -454,14 +532,16 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
struct vm_area_struct *vma,
unsigned long address, int avoid_reserve)
{
struct page *page = NULL;
struct page *page;
struct mempolicy *mpol;
nodemask_t *nodemask;
struct zonelist *zonelist;
struct zone *zone;
struct zoneref *z;
unsigned int cpuset_mems_cookie;
get_mems_allowed();
retry_cpuset:
cpuset_mems_cookie = get_mems_allowed();
zonelist = huge_zonelist(vma, address,
htlb_alloc_mask, &mpol, &nodemask);
/*
@ -488,10 +568,15 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
}
}
}
mpol_cond_put(mpol);
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
err:
mpol_cond_put(mpol);
put_mems_allowed();
return page;
return NULL;
}
static void update_and_free_page(struct hstate *h, struct page *page)
@ -533,9 +618,9 @@ static void free_huge_page(struct page *page)
*/
struct hstate *h = page_hstate(page);
int nid = page_to_nid(page);
struct address_space *mapping;
struct hugepage_subpool *spool =
(struct hugepage_subpool *)page_private(page);
mapping = (struct address_space *) page_private(page);
set_page_private(page, 0);
page->mapping = NULL;
BUG_ON(page_count(page));
@ -551,8 +636,7 @@ static void free_huge_page(struct page *page)
enqueue_huge_page(h, page);
}
spin_unlock(&hugetlb_lock);
if (mapping)
hugetlb_put_quota(mapping, 1);
hugepage_subpool_put_pages(spool, 1);
}
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
@ -852,6 +936,7 @@ static int gather_surplus_pages(struct hstate *h, int delta)
struct page *page, *tmp;
int ret, i;
int needed, allocated;
bool alloc_ok = true;
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
if (needed <= 0) {
@ -867,17 +952,13 @@ retry:
spin_unlock(&hugetlb_lock);
for (i = 0; i < needed; i++) {
page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page)
/*
* We were not able to allocate enough pages to
* satisfy the entire reservation so we free what
* we've allocated so far.
*/
goto free;
if (!page) {
alloc_ok = false;
break;
}
list_add(&page->lru, &surplus_list);
}
allocated += needed;
allocated += i;
/*
* After retaking hugetlb_lock, we need to recalculate 'needed'
@ -886,9 +967,16 @@ retry:
spin_lock(&hugetlb_lock);
needed = (h->resv_huge_pages + delta) -
(h->free_huge_pages + allocated);
if (needed > 0)
goto retry;
if (needed > 0) {
if (alloc_ok)
goto retry;
/*
* We were not able to allocate enough pages to
* satisfy the entire reservation so we free what
* we've allocated so far.
*/
goto free;
}
/*
* The surplus_list now contains _at_least_ the number of extra pages
* needed to accommodate the reservation. Add the appropriate number
@ -914,10 +1002,10 @@ retry:
VM_BUG_ON(page_count(page));
enqueue_huge_page(h, page);
}
free:
spin_unlock(&hugetlb_lock);
/* Free unnecessary surplus pages to the buddy allocator */
free:
if (!list_empty(&surplus_list)) {
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
list_del(&page->lru);
@ -966,11 +1054,12 @@ static void return_unused_surplus_pages(struct hstate *h,
/*
* Determine if the huge page at addr within the vma has an associated
* reservation. Where it does not we will need to logically increase
* reservation and actually increase quota before an allocation can occur.
* Where any new reservation would be required the reservation change is
* prepared, but not committed. Once the page has been quota'd allocated
* an instantiated the change should be committed via vma_commit_reservation.
* No action is required on failure.
* reservation and actually increase subpool usage before an allocation
* can occur. Where any new reservation would be required the
* reservation change is prepared, but not committed. Once the page
* has been allocated from the subpool and instantiated the change should
* be committed via vma_commit_reservation. No action is required on
* failure.
*/
static long vma_needs_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
@ -1019,24 +1108,24 @@ static void vma_commit_reservation(struct hstate *h,
static struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve)
{
struct hugepage_subpool *spool = subpool_vma(vma);
struct hstate *h = hstate_vma(vma);
struct page *page;
struct address_space *mapping = vma->vm_file->f_mapping;
struct inode *inode = mapping->host;
long chg;
/*
* Processes that did not create the mapping will have no reserves and
* will not have accounted against quota. Check that the quota can be
* made before satisfying the allocation
* MAP_NORESERVE mappings may also need pages and quota allocated
* if no reserve mapping overlaps.
* Processes that did not create the mapping will have no
* reserves and will not have accounted against subpool
* limit. Check that the subpool limit can be made before
* satisfying the allocation MAP_NORESERVE mappings may also
* need pages and subpool limit allocated allocated if no reserve
* mapping overlaps.
*/
chg = vma_needs_reservation(h, vma, addr);
if (chg < 0)
return ERR_PTR(-VM_FAULT_OOM);
if (chg)
if (hugetlb_get_quota(inode->i_mapping, chg))
if (hugepage_subpool_get_pages(spool, chg))
return ERR_PTR(-VM_FAULT_SIGBUS);
spin_lock(&hugetlb_lock);
@ -1046,12 +1135,12 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
if (!page) {
page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
hugetlb_put_quota(inode->i_mapping, chg);
hugepage_subpool_put_pages(spool, chg);
return ERR_PTR(-VM_FAULT_SIGBUS);
}
}
set_page_private(page, (unsigned long) mapping);
set_page_private(page, (unsigned long)spool);
vma_commit_reservation(h, vma, addr);
@ -2072,6 +2161,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
{
struct hstate *h = hstate_vma(vma);
struct resv_map *reservations = vma_resv_map(vma);
struct hugepage_subpool *spool = subpool_vma(vma);
unsigned long reserve;
unsigned long start;
unsigned long end;
@ -2087,7 +2177,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
if (reserve) {
hugetlb_acct_memory(h, -reserve);
hugetlb_put_quota(vma->vm_file->f_mapping, reserve);
hugepage_subpool_put_pages(spool, reserve);
}
}
}
@ -2276,6 +2366,10 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
if (pte_dirty(pte))
set_page_dirty(page);
list_add(&page->lru, &page_list);
/* Bail out after unmapping reference page if supplied */
if (ref_page)
break;
}
flush_tlb_range(vma, start, end);
spin_unlock(&mm->page_table_lock);
@ -2316,7 +2410,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
*/
address = address & huge_page_mask(h);
pgoff = vma_hugecache_offset(h, vma, address);
mapping = (struct address_space *)page_private(page);
mapping = vma->vm_file->f_dentry->d_inode->i_mapping;
/*
* Take the mapping lock for the duration of the table walk. As
@ -2869,11 +2963,12 @@ int hugetlb_reserve_pages(struct inode *inode,
{
long ret, chg;
struct hstate *h = hstate_inode(inode);
struct hugepage_subpool *spool = subpool_inode(inode);
/*
* Only apply hugepage reservation if asked. At fault time, an
* attempt will be made for VM_NORESERVE to allocate a page
* and filesystem quota without using reserves
* without using reserves
*/
if (vm_flags & VM_NORESERVE)
return 0;
@ -2900,17 +2995,17 @@ int hugetlb_reserve_pages(struct inode *inode,
if (chg < 0)
return chg;
/* There must be enough filesystem quota for the mapping */
if (hugetlb_get_quota(inode->i_mapping, chg))
/* There must be enough pages in the subpool for the mapping */
if (hugepage_subpool_get_pages(spool, chg))
return -ENOSPC;
/*
* Check enough hugepages are available for the reservation.
* Hand back the quota if there are not
* Hand the pages back to the subpool if there are not
*/
ret = hugetlb_acct_memory(h, chg);
if (ret < 0) {
hugetlb_put_quota(inode->i_mapping, chg);
hugepage_subpool_put_pages(spool, chg);
return ret;
}
@ -2934,12 +3029,13 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
{
struct hstate *h = hstate_inode(inode);
long chg = region_truncate(&inode->i_mapping->private_list, offset);
struct hugepage_subpool *spool = subpool_inode(inode);
spin_lock(&inode->i_lock);
inode->i_blocks -= (blocks_per_huge_page(h) * freed);
spin_unlock(&inode->i_lock);
hugetlb_put_quota(inode->i_mapping, (chg - freed));
hugepage_subpool_put_pages(spool, (chg - freed));
hugetlb_acct_memory(h, -(chg - freed));
}

34
mm/ksm.c
View File

@ -374,6 +374,20 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
return (ret & VM_FAULT_OOM) ? -ENOMEM : 0;
}
static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
unsigned long addr)
{
struct vm_area_struct *vma;
if (ksm_test_exit(mm))
return NULL;
vma = find_vma(mm, addr);
if (!vma || vma->vm_start > addr)
return NULL;
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
return NULL;
return vma;
}
static void break_cow(struct rmap_item *rmap_item)
{
struct mm_struct *mm = rmap_item->mm;
@ -387,15 +401,9 @@ static void break_cow(struct rmap_item *rmap_item)
put_anon_vma(rmap_item->anon_vma);
down_read(&mm->mmap_sem);
if (ksm_test_exit(mm))
goto out;
vma = find_vma(mm, addr);
if (!vma || vma->vm_start > addr)
goto out;
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
goto out;
break_ksm(vma, addr);
out:
vma = find_mergeable_vma(mm, addr);
if (vma)
break_ksm(vma, addr);
up_read(&mm->mmap_sem);
}
@ -421,12 +429,8 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
struct page *page;
down_read(&mm->mmap_sem);
if (ksm_test_exit(mm))
goto out;
vma = find_vma(mm, addr);
if (!vma || vma->vm_start > addr)
goto out;
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
vma = find_mergeable_vma(mm, addr);
if (!vma)
goto out;
page = follow_page(vma, addr, FOLL_GET);

473
mm/memcontrol.c
View File

@ -89,7 +89,6 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
MEM_CGROUP_ON_MOVE, /* someone is moving account between groups */
MEM_CGROUP_STAT_NSTATS,
};
@ -135,7 +134,7 @@ struct mem_cgroup_reclaim_iter {
*/
struct mem_cgroup_per_zone {
struct lruvec lruvec;
unsigned long count[NR_LRU_LISTS];
unsigned long lru_size[NR_LRU_LISTS];
struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];
@ -144,11 +143,9 @@ struct mem_cgroup_per_zone {
unsigned long long usage_in_excess;/* Set to the value by which */
/* the soft limit is exceeded*/
bool on_tree;
struct mem_cgroup *mem; /* Back pointer, we cannot */
struct mem_cgroup *memcg; /* Back pointer, we cannot */
/* use container_of */
};
/* Macro for accessing counter */
#define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
struct mem_cgroup_per_node {
struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
@ -299,6 +296,12 @@ struct mem_cgroup {
* mem_cgroup ? And what type of charges should we move ?
*/
unsigned long move_charge_at_immigrate;
/*
* set > 0 if pages under this cgroup are moving to other cgroup.
*/
atomic_t moving_account;
/* taken only while moving_account > 0 */
spinlock_t move_lock;
/*
* percpu counter.
*/
@ -612,9 +615,9 @@ retry:
* we will to add it back at the end of reclaim to its correct
* position in the tree.
*/
__mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
if (!res_counter_soft_limit_excess(&mz->mem->res) ||
!css_tryget(&mz->mem->css))
__mem_cgroup_remove_exceeded(mz->memcg, mz, mctz);
if (!res_counter_soft_limit_excess(&mz->memcg->res) ||
!css_tryget(&mz->memcg->css))
goto retry;
done:
return mz;
@ -692,15 +695,19 @@ static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
}
static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
bool file, int nr_pages)
bool anon, int nr_pages)
{
preempt_disable();
if (file)
__this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_CACHE],
/*
* Here, RSS means 'mapped anon' and anon's SwapCache. Shmem/tmpfs is
* counted as CACHE even if it's on ANON LRU.
*/
if (anon)
__this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_RSS],
nr_pages);
else
__this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_RSS],
__this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_CACHE],
nr_pages);
/* pagein of a big page is an event. So, ignore page size */
@ -721,14 +728,14 @@ mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
unsigned int lru_mask)
{
struct mem_cgroup_per_zone *mz;
enum lru_list l;
enum lru_list lru;
unsigned long ret = 0;
mz = mem_cgroup_zoneinfo(memcg, nid, zid);
for_each_lru(l) {
if (BIT(l) & lru_mask)
ret += MEM_CGROUP_ZSTAT(mz, l);
for_each_lru(lru) {
if (BIT(lru) & lru_mask)
ret += mz->lru_size[lru];
}
return ret;
}
@ -1077,7 +1084,7 @@ struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page,
mz = page_cgroup_zoneinfo(memcg, page);
/* compound_order() is stabilized through lru_lock */
MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
mz->lru_size[lru] += 1 << compound_order(page);
return &mz->lruvec;
}
@ -1105,8 +1112,8 @@ void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
VM_BUG_ON(!memcg);
mz = page_cgroup_zoneinfo(memcg, page);
/* huge page split is done under lru_lock. so, we have no races. */
VM_BUG_ON(MEM_CGROUP_ZSTAT(mz, lru) < (1 << compound_order(page)));
MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
VM_BUG_ON(mz->lru_size[lru] < (1 << compound_order(page)));
mz->lru_size[lru] -= 1 << compound_order(page);
}
void mem_cgroup_lru_del(struct page *page)
@ -1285,40 +1292,48 @@ int mem_cgroup_swappiness(struct mem_cgroup *memcg)
return memcg->swappiness;
}
/*
* memcg->moving_account is used for checking possibility that some thread is
* calling move_account(). When a thread on CPU-A starts moving pages under
* a memcg, other threads should check memcg->moving_account under
* rcu_read_lock(), like this:
*
* CPU-A CPU-B
* rcu_read_lock()
* memcg->moving_account+1 if (memcg->mocing_account)
* take heavy locks.
* synchronize_rcu() update something.
* rcu_read_unlock()
* start move here.
*/
/* for quick checking without looking up memcg */
atomic_t memcg_moving __read_mostly;
static void mem_cgroup_start_move(struct mem_cgroup *memcg)
{
int cpu;
get_online_cpus();
spin_lock(&memcg->pcp_counter_lock);
for_each_online_cpu(cpu)
per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) += 1;
memcg->nocpu_base.count[MEM_CGROUP_ON_MOVE] += 1;
spin_unlock(&memcg->pcp_counter_lock);
put_online_cpus();
atomic_inc(&memcg_moving);
atomic_inc(&memcg->moving_account);
synchronize_rcu();
}
static void mem_cgroup_end_move(struct mem_cgroup *memcg)
{
int cpu;
if (!memcg)
return;
get_online_cpus();
spin_lock(&memcg->pcp_counter_lock);
for_each_online_cpu(cpu)
per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) -= 1;
memcg->nocpu_base.count[MEM_CGROUP_ON_MOVE] -= 1;
spin_unlock(&memcg->pcp_counter_lock);
put_online_cpus();
/*
* Now, mem_cgroup_clear_mc() may call this function with NULL.
* We check NULL in callee rather than caller.
*/
if (memcg) {
atomic_dec(&memcg_moving);
atomic_dec(&memcg->moving_account);
}
}
/*
* 2 routines for checking "mem" is under move_account() or not.
*
* mem_cgroup_stealed() - checking a cgroup is mc.from or not. This is used
* for avoiding race in accounting. If true,
* mem_cgroup_stolen() - checking whether a cgroup is mc.from or not. This
* is used for avoiding races in accounting. If true,
* pc->mem_cgroup may be overwritten.
*
* mem_cgroup_under_move() - checking a cgroup is mc.from or mc.to or
@ -1326,10 +1341,10 @@ static void mem_cgroup_end_move(struct mem_cgroup *memcg)
* waiting at hith-memory prressure caused by "move".
*/
static bool mem_cgroup_stealed(struct mem_cgroup *memcg)
static bool mem_cgroup_stolen(struct mem_cgroup *memcg)
{
VM_BUG_ON(!rcu_read_lock_held());
return this_cpu_read(memcg->stat->count[MEM_CGROUP_ON_MOVE]) > 0;
return atomic_read(&memcg->moving_account) > 0;
}
static bool mem_cgroup_under_move(struct mem_cgroup *memcg)
@ -1370,6 +1385,24 @@ static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
return false;
}
/*
* Take this lock when
* - a code tries to modify page's memcg while it's USED.
* - a code tries to modify page state accounting in a memcg.
* see mem_cgroup_stolen(), too.
*/
static void move_lock_mem_cgroup(struct mem_cgroup *memcg,
unsigned long *flags)
{
spin_lock_irqsave(&memcg->move_lock, *flags);
}
static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
unsigned long *flags)
{
spin_unlock_irqrestore(&memcg->move_lock, *flags);
}
/**
* mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode.
* @memcg: The memory cgroup that went over limit
@ -1393,7 +1426,6 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
if (!memcg || !p)
return;
rcu_read_lock();
mem_cgrp = memcg->css.cgroup;
@ -1772,22 +1804,22 @@ static DEFINE_SPINLOCK(memcg_oom_lock);
static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);
struct oom_wait_info {
struct mem_cgroup *mem;
struct mem_cgroup *memcg;
wait_queue_t wait;
};
static int memcg_oom_wake_function(wait_queue_t *wait,
unsigned mode, int sync, void *arg)
{
struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg,
*oom_wait_memcg;
struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg;
struct mem_cgroup *oom_wait_memcg;
struct oom_wait_info *oom_wait_info;
oom_wait_info = container_of(wait, struct oom_wait_info, wait);
oom_wait_memcg = oom_wait_info->mem;
oom_wait_memcg = oom_wait_info->memcg;
/*
* Both of oom_wait_info->mem and wake_mem are stable under us.
* Both of oom_wait_info->memcg and wake_memcg are stable under us.
* Then we can use css_is_ancestor without taking care of RCU.
*/
if (!mem_cgroup_same_or_subtree(oom_wait_memcg, wake_memcg)
@ -1811,12 +1843,12 @@ static void memcg_oom_recover(struct mem_cgroup *memcg)
/*
* try to call OOM killer. returns false if we should exit memory-reclaim loop.
*/
bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
{
struct oom_wait_info owait;
bool locked, need_to_kill;
owait.mem = memcg;
owait.memcg = memcg;
owait.wait.flags = 0;
owait.wait.func = memcg_oom_wake_function;
owait.wait.private = current;
@ -1841,7 +1873,7 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
if (need_to_kill) {
finish_wait(&memcg_oom_waitq, &owait.wait);
mem_cgroup_out_of_memory(memcg, mask);
mem_cgroup_out_of_memory(memcg, mask, order);
} else {
schedule();
finish_wait(&memcg_oom_waitq, &owait.wait);
@ -1881,41 +1913,66 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
* by flags.
*
* Considering "move", this is an only case we see a race. To make the race
* small, we check MEM_CGROUP_ON_MOVE percpu value and detect there are
* possibility of race condition. If there is, we take a lock.
* small, we check mm->moving_account and detect there are possibility of race
* If there is, we take a lock.
*/
void __mem_cgroup_begin_update_page_stat(struct page *page,
bool *locked, unsigned long *flags)
{
struct mem_cgroup *memcg;
struct page_cgroup *pc;
pc = lookup_page_cgroup(page);
again:
memcg = pc->mem_cgroup;
if (unlikely(!memcg || !PageCgroupUsed(pc)))
return;
/*
* If this memory cgroup is not under account moving, we don't
* need to take move_lock_page_cgroup(). Because we already hold
* rcu_read_lock(), any calls to move_account will be delayed until
* rcu_read_unlock() if mem_cgroup_stolen() == true.
*/
if (!mem_cgroup_stolen(memcg))
return;
move_lock_mem_cgroup(memcg, flags);
if (memcg != pc->mem_cgroup || !PageCgroupUsed(pc)) {
move_unlock_mem_cgroup(memcg, flags);
goto again;
}
*locked = true;
}
void __mem_cgroup_end_update_page_stat(struct page *page, unsigned long *flags)
{
struct page_cgroup *pc = lookup_page_cgroup(page);
/*
* It's guaranteed that pc->mem_cgroup never changes while
* lock is held because a routine modifies pc->mem_cgroup
* should take move_lock_page_cgroup().
*/
move_unlock_mem_cgroup(pc->mem_cgroup, flags);
}
void mem_cgroup_update_page_stat(struct page *page,
enum mem_cgroup_page_stat_item idx, int val)
{
struct mem_cgroup *memcg;
struct page_cgroup *pc = lookup_page_cgroup(page);
bool need_unlock = false;
unsigned long uninitialized_var(flags);
if (mem_cgroup_disabled())
return;
rcu_read_lock();
memcg = pc->mem_cgroup;
if (unlikely(!memcg || !PageCgroupUsed(pc)))
goto out;
/* pc->mem_cgroup is unstable ? */
if (unlikely(mem_cgroup_stealed(memcg)) || PageTransHuge(page)) {
/* take a lock against to access pc->mem_cgroup */
move_lock_page_cgroup(pc, &flags);
need_unlock = true;
memcg = pc->mem_cgroup;
if (!memcg || !PageCgroupUsed(pc))
goto out;
}
return;
switch (idx) {
case MEMCG_NR_FILE_MAPPED:
if (val > 0)
SetPageCgroupFileMapped(pc);
else if (!page_mapped(page))
ClearPageCgroupFileMapped(pc);
idx = MEM_CGROUP_STAT_FILE_MAPPED;
break;
default:
@ -1923,14 +1980,7 @@ void mem_cgroup_update_page_stat(struct page *page,
}
this_cpu_add(memcg->stat->count[idx], val);
out:
if (unlikely(need_unlock))
move_unlock_page_cgroup(pc, &flags);
rcu_read_unlock();
return;
}
EXPORT_SYMBOL(mem_cgroup_update_page_stat);
/*
* size of first charge trial. "32" comes from vmscan.c's magic value.
@ -2101,17 +2151,6 @@ static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *memcg, int cpu)
per_cpu(memcg->stat->events[i], cpu) = 0;
memcg->nocpu_base.events[i] += x;
}
/* need to clear ON_MOVE value, works as a kind of lock. */
per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) = 0;
spin_unlock(&memcg->pcp_counter_lock);
}
static void synchronize_mem_cgroup_on_move(struct mem_cgroup *memcg, int cpu)
{
int idx = MEM_CGROUP_ON_MOVE;
spin_lock(&memcg->pcp_counter_lock);
per_cpu(memcg->stat->count[idx], cpu) = memcg->nocpu_base.count[idx];
spin_unlock(&memcg->pcp_counter_lock);
}
@ -2123,11 +2162,8 @@ static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
struct memcg_stock_pcp *stock;
struct mem_cgroup *iter;
if ((action == CPU_ONLINE)) {
for_each_mem_cgroup(iter)
synchronize_mem_cgroup_on_move(iter, cpu);
if (action == CPU_ONLINE)
return NOTIFY_OK;
}
if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
return NOTIFY_OK;
@ -2212,7 +2248,7 @@ static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
if (!oom_check)
return CHARGE_NOMEM;
/* check OOM */
if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask))
if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask, get_order(csize)))
return CHARGE_OOM_DIE;
return CHARGE_RETRY;
@ -2446,6 +2482,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
{
struct zone *uninitialized_var(zone);
bool was_on_lru = false;
bool anon;
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
@ -2481,19 +2518,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
* See mem_cgroup_add_lru_list(), etc.
*/
smp_wmb();
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_CACHE:
case MEM_CGROUP_CHARGE_TYPE_SHMEM:
SetPageCgroupCache(pc);
SetPageCgroupUsed(pc);
break;
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
ClearPageCgroupCache(pc);
SetPageCgroupUsed(pc);
break;
default:
break;
}
SetPageCgroupUsed(pc);
if (lrucare) {
if (was_on_lru) {
@ -2504,7 +2529,12 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
spin_unlock_irq(&zone->lru_lock);
}
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), nr_pages);
if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
anon = true;
else
anon = false;
mem_cgroup_charge_statistics(memcg, anon, nr_pages);
unlock_page_cgroup(pc);
/*
@ -2517,8 +2547,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MOVE_LOCK) |\
(1 << PCG_MIGRATION))
#define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MIGRATION))
/*
* Because tail pages are not marked as "used", set it. We're under
* zone->lru_lock, 'splitting on pmd' and compound_lock.
@ -2569,6 +2598,7 @@ static int mem_cgroup_move_account(struct page *page,
{
unsigned long flags;
int ret;
bool anon = PageAnon(page);
VM_BUG_ON(from == to);
VM_BUG_ON(PageLRU(page));
@ -2588,23 +2618,23 @@ static int mem_cgroup_move_account(struct page *page,
if (!PageCgroupUsed(pc) || pc->mem_cgroup != from)
goto unlock;
move_lock_page_cgroup(pc, &flags);
move_lock_mem_cgroup(from, &flags);
if (PageCgroupFileMapped(pc)) {
if (!anon && page_mapped(page)) {
/* Update mapped_file data for mem_cgroup */
preempt_disable();
__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
__this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
preempt_enable();
}
mem_cgroup_charge_statistics(from, PageCgroupCache(pc), -nr_pages);
mem_cgroup_charge_statistics(from, anon, -nr_pages);
if (uncharge)
/* This is not "cancel", but cancel_charge does all we need. */
__mem_cgroup_cancel_charge(from, nr_pages);
/* caller should have done css_get */
pc->mem_cgroup = to;
mem_cgroup_charge_statistics(to, PageCgroupCache(pc), nr_pages);
mem_cgroup_charge_statistics(to, anon, nr_pages);
/*
* We charges against "to" which may not have any tasks. Then, "to"
* can be under rmdir(). But in current implementation, caller of
@ -2612,7 +2642,7 @@ static int mem_cgroup_move_account(struct page *page,
* guaranteed that "to" is never removed. So, we don't check rmdir
* status here.
*/
move_unlock_page_cgroup(pc, &flags);
move_unlock_mem_cgroup(from, &flags);
ret = 0;
unlock:
unlock_page_cgroup(pc);
@ -2914,7 +2944,6 @@ direct_uncharge:
res_counter_uncharge(&memcg->memsw, nr_pages * PAGE_SIZE);
if (unlikely(batch->memcg != memcg))
memcg_oom_recover(memcg);
return;
}
/*
@ -2926,6 +2955,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
struct mem_cgroup *memcg = NULL;
unsigned int nr_pages = 1;
struct page_cgroup *pc;
bool anon;
if (mem_cgroup_disabled())
return NULL;
@ -2951,8 +2981,17 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
if (!PageCgroupUsed(pc))
goto unlock_out;
anon = PageAnon(page);
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
/*
* Generally PageAnon tells if it's the anon statistics to be
* updated; but sometimes e.g. mem_cgroup_uncharge_page() is
* used before page reached the stage of being marked PageAnon.
*/
anon = true;
/* fallthrough */
case MEM_CGROUP_CHARGE_TYPE_DROP:
/* See mem_cgroup_prepare_migration() */
if (page_mapped(page) || PageCgroupMigration(pc))
@ -2969,7 +3008,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
break;
}
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), -nr_pages);
mem_cgroup_charge_statistics(memcg, anon, -nr_pages);
ClearPageCgroupUsed(pc);
/*
@ -3276,6 +3315,7 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
{
struct page *used, *unused;
struct page_cgroup *pc;
bool anon;
if (!memcg)
return;
@ -3297,8 +3337,10 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
lock_page_cgroup(pc);
ClearPageCgroupMigration(pc);
unlock_page_cgroup(pc);
__mem_cgroup_uncharge_common(unused, MEM_CGROUP_CHARGE_TYPE_FORCE);
anon = PageAnon(used);
__mem_cgroup_uncharge_common(unused,
anon ? MEM_CGROUP_CHARGE_TYPE_MAPPED
: MEM_CGROUP_CHARGE_TYPE_CACHE);
/*
* If a page is a file cache, radix-tree replacement is very atomic
@ -3308,7 +3350,7 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
* and USED bit check in mem_cgroup_uncharge_page() will do enough
* check. (see prepare_charge() also)
*/
if (PageAnon(used))
if (anon)
mem_cgroup_uncharge_page(used);
/*
* At migration, we may charge account against cgroup which has no
@ -3338,7 +3380,7 @@ void mem_cgroup_replace_page_cache(struct page *oldpage,
/* fix accounting on old pages */
lock_page_cgroup(pc);
memcg = pc->mem_cgroup;
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), -1);
mem_cgroup_charge_statistics(memcg, false, -1);
ClearPageCgroupUsed(pc);
unlock_page_cgroup(pc);
@ -3549,7 +3591,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
break;
nr_scanned = 0;
reclaimed = mem_cgroup_soft_reclaim(mz->mem, zone,
reclaimed = mem_cgroup_soft_reclaim(mz->memcg, zone,
gfp_mask, &nr_scanned);
nr_reclaimed += reclaimed;
*total_scanned += nr_scanned;
@ -3576,13 +3618,13 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
next_mz =
__mem_cgroup_largest_soft_limit_node(mctz);
if (next_mz == mz)
css_put(&next_mz->mem->css);
css_put(&next_mz->memcg->css);
else /* next_mz == NULL or other memcg */
break;
} while (1);
}
__mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
excess = res_counter_soft_limit_excess(&mz->mem->res);
__mem_cgroup_remove_exceeded(mz->memcg, mz, mctz);
excess = res_counter_soft_limit_excess(&mz->memcg->res);
/*
* One school of thought says that we should not add
* back the node to the tree if reclaim returns 0.
@ -3592,9 +3634,9 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
* term TODO.
*/
/* If excess == 0, no tree ops */
__mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess);
__mem_cgroup_insert_exceeded(mz->memcg, mz, mctz, excess);
spin_unlock(&mctz->lock);
css_put(&mz->mem->css);
css_put(&mz->memcg->css);
loop++;
/*
* Could not reclaim anything and there are no more
@ -3607,7 +3649,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
break;
} while (!nr_reclaimed);
if (next_mz)
css_put(&next_mz->mem->css);
css_put(&next_mz->memcg->css);
return nr_reclaimed;
}
@ -3629,7 +3671,7 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
mz = mem_cgroup_zoneinfo(memcg, node, zid);
list = &mz->lruvec.lists[lru];
loop = MEM_CGROUP_ZSTAT(mz, lru);
loop = mz->lru_size[lru];
/* give some margin against EBUSY etc...*/
loop += 256;
busy = NULL;
@ -3703,10 +3745,10 @@ move_account:
mem_cgroup_start_move(memcg);
for_each_node_state(node, N_HIGH_MEMORY) {
for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
enum lru_list l;
for_each_lru(l) {
enum lru_list lru;
for_each_lru(lru) {
ret = mem_cgroup_force_empty_list(memcg,
node, zid, l);
node, zid, lru);
if (ret)
break;
}
@ -3860,7 +3902,6 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
break;
default:
BUG();
break;
}
return val;
}
@ -3939,7 +3980,6 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
out:
*mem_limit = min_limit;
*memsw_limit = min_memsw_limit;
return;
}
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
@ -4098,38 +4138,38 @@ static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
unsigned long total_nr, file_nr, anon_nr, unevictable_nr;
unsigned long node_nr;
struct cgroup *cont = m->private;
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
total_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL);
total_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL);
seq_printf(m, "total=%lu", total_nr);
for_each_node_state(nid, N_HIGH_MEMORY) {
node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid, LRU_ALL);
node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL);
seq_printf(m, " N%d=%lu", nid, node_nr);
}
seq_putc(m, '\n');
file_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL_FILE);
file_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_FILE);
seq_printf(m, "file=%lu", file_nr);
for_each_node_state(nid, N_HIGH_MEMORY) {
node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
LRU_ALL_FILE);
seq_printf(m, " N%d=%lu", nid, node_nr);
}
seq_putc(m, '\n');
anon_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL_ANON);
anon_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_ANON);
seq_printf(m, "anon=%lu", anon_nr);
for_each_node_state(nid, N_HIGH_MEMORY) {
node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
LRU_ALL_ANON);
seq_printf(m, " N%d=%lu", nid, node_nr);
}
seq_putc(m, '\n');
unevictable_nr = mem_cgroup_nr_lru_pages(mem_cont, BIT(LRU_UNEVICTABLE));
unevictable_nr = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_UNEVICTABLE));
seq_printf(m, "unevictable=%lu", unevictable_nr);
for_each_node_state(nid, N_HIGH_MEMORY) {
node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
BIT(LRU_UNEVICTABLE));
seq_printf(m, " N%d=%lu", nid, node_nr);
}
@ -4141,12 +4181,12 @@ static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
struct mcs_total_stat mystat;
int i;
memset(&mystat, 0, sizeof(mystat));
mem_cgroup_get_local_stat(mem_cont, &mystat);
mem_cgroup_get_local_stat(memcg, &mystat);
for (i = 0; i < NR_MCS_STAT; i++) {
@ -4158,14 +4198,14 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
/* Hierarchical information */
{
unsigned long long limit, memsw_limit;
memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
memcg_get_hierarchical_limit(memcg, &limit, &memsw_limit);
cb->fill(cb, "hierarchical_memory_limit", limit);
if (do_swap_account)
cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
}
memset(&mystat, 0, sizeof(mystat));
mem_cgroup_get_total_stat(mem_cont, &mystat);
mem_cgroup_get_total_stat(memcg, &mystat);
for (i = 0; i < NR_MCS_STAT; i++) {
if (i == MCS_SWAP && !do_swap_account)
continue;
@ -4181,7 +4221,7 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
for_each_online_node(nid)
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
mz = mem_cgroup_zoneinfo(memcg, nid, zid);
recent_rotated[0] +=
mz->reclaim_stat.recent_rotated[0];
@ -4426,12 +4466,6 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
else
BUG();
/*
* Something went wrong if we trying to unregister a threshold
* if we don't have thresholds
*/
BUG_ON(!thresholds);
if (!thresholds->primary)
goto unlock;
@ -4736,7 +4770,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
struct mem_cgroup_per_node *pn;
struct mem_cgroup_per_zone *mz;
enum lru_list l;
enum lru_list lru;
int zone, tmp = node;
/*
* This routine is called against possible nodes.
@ -4754,11 +4788,11 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
mz = &pn->zoneinfo[zone];
for_each_lru(l)
INIT_LIST_HEAD(&mz->lruvec.lists[l]);
for_each_lru(lru)
INIT_LIST_HEAD(&mz->lruvec.lists[lru]);
mz->usage_in_excess = 0;
mz->on_tree = false;
mz->mem = memcg;
mz->memcg = memcg;
}
memcg->info.nodeinfo[node] = pn;
return 0;
@ -4771,29 +4805,29 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
static struct mem_cgroup *mem_cgroup_alloc(void)
{
struct mem_cgroup *mem;
struct mem_cgroup *memcg;
int size = sizeof(struct mem_cgroup);
/* Can be very big if MAX_NUMNODES is very big */
if (size < PAGE_SIZE)
mem = kzalloc(size, GFP_KERNEL);
memcg = kzalloc(size, GFP_KERNEL);
else
mem = vzalloc(size);
memcg = vzalloc(size);
if (!mem)
if (!memcg)
return NULL;
mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
if (!mem->stat)
memcg->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
if (!memcg->stat)
goto out_free;
spin_lock_init(&mem->pcp_counter_lock);
return mem;
spin_lock_init(&memcg->pcp_counter_lock);
return memcg;
out_free:
if (size < PAGE_SIZE)
kfree(mem);
kfree(memcg);
else
vfree(mem);
vfree(memcg);
return NULL;
}
@ -4981,6 +5015,7 @@ mem_cgroup_create(struct cgroup *cont)
atomic_set(&memcg->refcnt, 1);
memcg->move_charge_at_immigrate = 0;
mutex_init(&memcg->thresholds_lock);
spin_lock_init(&memcg->move_lock);
return &memcg->css;
free_out:
__mem_cgroup_free(memcg);
@ -5075,7 +5110,7 @@ one_by_one:
}
/**
* is_target_pte_for_mc - check a pte whether it is valid for move charge
* get_mctgt_type - get target type of moving charge
* @vma: the vma the pte to be checked belongs
* @addr: the address corresponding to the pte to be checked
* @ptent: the pte to be checked
@ -5098,7 +5133,7 @@ union mc_target {
};
enum mc_target_type {
MC_TARGET_NONE, /* not used */
MC_TARGET_NONE = 0,
MC_TARGET_PAGE,
MC_TARGET_SWAP,
};
@ -5179,12 +5214,12 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
return page;
}
static int is_target_pte_for_mc(struct vm_area_struct *vma,
static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, union mc_target *target)
{
struct page *page = NULL;
struct page_cgroup *pc;
int ret = 0;
enum mc_target_type ret = MC_TARGET_NONE;
swp_entry_t ent = { .val = 0 };
if (pte_present(ptent))
@ -5195,7 +5230,7 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
page = mc_handle_file_pte(vma, addr, ptent, &ent);
if (!page && !ent.val)
return 0;
return ret;
if (page) {
pc = lookup_page_cgroup(page);
/*
@ -5221,6 +5256,41 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
return ret;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* We don't consider swapping or file mapped pages because THP does not
* support them for now.
* Caller should make sure that pmd_trans_huge(pmd) is true.
*/
static enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma,
unsigned long addr, pmd_t pmd, union mc_target *target)
{
struct page *page = NULL;
struct page_cgroup *pc;
enum mc_target_type ret = MC_TARGET_NONE;
page = pmd_page(pmd);
VM_BUG_ON(!page || !PageHead(page));
if (!move_anon())
return ret;
pc = lookup_page_cgroup(page);
if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) {
ret = MC_TARGET_PAGE;
if (target) {
get_page(page);
target->page = page;
}
}
return ret;
}
#else
static inline enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma,
unsigned long addr, pmd_t pmd, union mc_target *target)
{
return MC_TARGET_NONE;
}
#endif
static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
unsigned long addr, unsigned long end,
struct mm_walk *walk)
@ -5229,11 +5299,16 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
pte_t *pte;
spinlock_t *ptl;
split_huge_page_pmd(walk->mm, pmd);
if (pmd_trans_huge_lock(pmd, vma) == 1) {
if (get_mctgt_type_thp(vma, addr, *pmd, NULL) == MC_TARGET_PAGE)
mc.precharge += HPAGE_PMD_NR;
spin_unlock(&vma->vm_mm->page_table_lock);
return 0;
}
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE)
if (is_target_pte_for_mc(vma, addr, *pte, NULL))
if (get_mctgt_type(vma, addr, *pte, NULL))
mc.precharge++; /* increment precharge temporarily */
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
@ -5388,23 +5463,55 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
struct vm_area_struct *vma = walk->private;
pte_t *pte;
spinlock_t *ptl;
enum mc_target_type target_type;
union mc_target target;
struct page *page;
struct page_cgroup *pc;
/*
* We don't take compound_lock() here but no race with splitting thp
* happens because:
* - if pmd_trans_huge_lock() returns 1, the relevant thp is not
* under splitting, which means there's no concurrent thp split,
* - if another thread runs into split_huge_page() just after we
* entered this if-block, the thread must wait for page table lock
* to be unlocked in __split_huge_page_splitting(), where the main
* part of thp split is not executed yet.
*/
if (pmd_trans_huge_lock(pmd, vma) == 1) {
if (!mc.precharge) {
spin_unlock(&vma->vm_mm->page_table_lock);
return 0;
}
target_type = get_mctgt_type_thp(vma, addr, *pmd, &target);
if (target_type == MC_TARGET_PAGE) {
page = target.page;
if (!isolate_lru_page(page)) {
pc = lookup_page_cgroup(page);
if (!mem_cgroup_move_account(page, HPAGE_PMD_NR,
pc, mc.from, mc.to,
false)) {
mc.precharge -= HPAGE_PMD_NR;
mc.moved_charge += HPAGE_PMD_NR;
}
putback_lru_page(page);
}
put_page(page);
}
spin_unlock(&vma->vm_mm->page_table_lock);
return 0;
}
split_huge_page_pmd(walk->mm, pmd);
retry:
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; addr += PAGE_SIZE) {
pte_t ptent = *(pte++);
union mc_target target;
int type;
struct page *page;
struct page_cgroup *pc;
swp_entry_t ent;
if (!mc.precharge)
break;
type = is_target_pte_for_mc(vma, addr, ptent, &target);
switch (type) {
switch (get_mctgt_type(vma, addr, ptent, &target)) {
case MC_TARGET_PAGE:
page = target.page;
if (isolate_lru_page(page))
@ -5417,7 +5524,7 @@ retry:
mc.moved_charge++;
}
putback_lru_page(page);
put: /* is_target_pte_for_mc() gets the page */
put: /* get_mctgt_type() gets the page */
put_page(page);
break;
case MC_TARGET_SWAP:

2
mm/memory-failure.c
View File

@ -1063,7 +1063,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
* The check (unnecessarily) ignores LRU pages being isolated and
* walked by the page reclaim code, however that's not a big loss.
*/
if (!PageHuge(p) && !PageTransCompound(p)) {
if (!PageHuge(p) && !PageTransTail(p)) {
if (!PageLRU(p))
shake_page(p, 0);
if (!PageLRU(p)) {

53
mm/memory.c
View File

@ -125,17 +125,17 @@ core_initcall(init_zero_pfn);
#if defined(SPLIT_RSS_COUNTING)
static void __sync_task_rss_stat(struct task_struct *task, struct mm_struct *mm)
void sync_mm_rss(struct mm_struct *mm)
{
int i;
for (i = 0; i < NR_MM_COUNTERS; i++) {
if (task->rss_stat.count[i]) {
add_mm_counter(mm, i, task->rss_stat.count[i]);
task->rss_stat.count[i] = 0;
if (current->rss_stat.count[i]) {
add_mm_counter(mm, i, current->rss_stat.count[i]);
current->rss_stat.count[i] = 0;
}
}
task->rss_stat.events = 0;
current->rss_stat.events = 0;
}
static void add_mm_counter_fast(struct mm_struct *mm, int member, int val)
@ -157,30 +157,7 @@ static void check_sync_rss_stat(struct task_struct *task)
if (unlikely(task != current))
return;
if (unlikely(task->rss_stat.events++ > TASK_RSS_EVENTS_THRESH))
__sync_task_rss_stat(task, task->mm);
}
unsigned long get_mm_counter(struct mm_struct *mm, int member)
{
long val = 0;
/*
* Don't use task->mm here...for avoiding to use task_get_mm()..
* The caller must guarantee task->mm is not invalid.
*/
val = atomic_long_read(&mm->rss_stat.count[member]);
/*
* counter is updated in asynchronous manner and may go to minus.
* But it's never be expected number for users.
*/
if (val < 0)
return 0;
return (unsigned long)val;
}
void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
{
__sync_task_rss_stat(task, mm);
sync_mm_rss(task->mm);
}
#else /* SPLIT_RSS_COUNTING */
@ -661,7 +638,7 @@ static inline void add_mm_rss_vec(struct mm_struct *mm, int *rss)
int i;
if (current->mm == mm)
sync_mm_rss(current, mm);
sync_mm_rss(mm);
for (i = 0; i < NR_MM_COUNTERS; i++)
if (rss[i])
add_mm_counter(mm, i, rss[i]);
@ -1247,16 +1224,24 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
do {
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) {
if (next-addr != HPAGE_PMD_SIZE) {
if (next - addr != HPAGE_PMD_SIZE) {
VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
split_huge_page_pmd(vma->vm_mm, pmd);
} else if (zap_huge_pmd(tlb, vma, pmd, addr))
continue;
goto next;
/* fall through */
}
if (pmd_none_or_clear_bad(pmd))
continue;
/*
* Here there can be other concurrent MADV_DONTNEED or
* trans huge page faults running, and if the pmd is
* none or trans huge it can change under us. This is
* because MADV_DONTNEED holds the mmap_sem in read
* mode.
*/
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
goto next;
next = zap_pte_range(tlb, vma, pmd, addr, next, details);
next:
cond_resched();
} while (pmd++, addr = next, addr != end);

62
mm/mempolicy.c
View File

@ -512,7 +512,7 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
do {
next = pmd_addr_end(addr, end);
split_huge_page_pmd(vma->vm_mm, pmd);
if (pmd_none_or_clear_bad(pmd))
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
if (check_pte_range(vma, pmd, addr, next, nodes,
flags, private))
@ -1323,12 +1323,9 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
err = -ESRCH;
goto out;
}
mm = get_task_mm(task);
rcu_read_unlock();
get_task_struct(task);
err = -EINVAL;
if (!mm)
goto out;
/*
* Check if this process has the right to modify the specified
@ -1336,14 +1333,13 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
* capabilities, superuser privileges or the same
* userid as the target process.
*/
rcu_read_lock();
tcred = __task_cred(task);
if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
goto out;
goto out_put;
}
rcu_read_unlock();
@ -1351,26 +1347,36 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
/* Is the user allowed to access the target nodes? */
if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) {
err = -EPERM;
goto out;
goto out_put;
}
if (!nodes_subset(*new, node_states[N_HIGH_MEMORY])) {
err = -EINVAL;
goto out;
goto out_put;
}
err = security_task_movememory(task);
if (err)
goto out;
goto out_put;
err = do_migrate_pages(mm, old, new,
capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
out:
mm = get_task_mm(task);
put_task_struct(task);
if (mm)
mmput(mm);
err = do_migrate_pages(mm, old, new,
capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
else
err = -EINVAL;
mmput(mm);
out:
NODEMASK_SCRATCH_FREE(scratch);
return err;
out_put:
put_task_struct(task);
goto out;
}
@ -1844,18 +1850,24 @@ struct page *
alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
unsigned long addr, int node)
{
struct mempolicy *pol = get_vma_policy(current, vma, addr);
struct mempolicy *pol;
struct zonelist *zl;
struct page *page;
unsigned int cpuset_mems_cookie;
retry_cpuset:
pol = get_vma_policy(current, vma, addr);
cpuset_mems_cookie = get_mems_allowed();
get_mems_allowed();
if (unlikely(pol->mode == MPOL_INTERLEAVE)) {
unsigned nid;
nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order);
mpol_cond_put(pol);
page = alloc_page_interleave(gfp, order, nid);
put_mems_allowed();
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
}
zl = policy_zonelist(gfp, pol, node);
@ -1866,7 +1878,8 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
struct page *page = __alloc_pages_nodemask(gfp, order,
zl, policy_nodemask(gfp, pol));
__mpol_put(pol);
put_mems_allowed();
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
}
/*
@ -1874,7 +1887,8 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
*/
page = __alloc_pages_nodemask(gfp, order, zl,
policy_nodemask(gfp, pol));
put_mems_allowed();
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
}
@ -1901,11 +1915,14 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
{
struct mempolicy *pol = current->mempolicy;
struct page *page;
unsigned int cpuset_mems_cookie;
if (!pol || in_interrupt() || (gfp & __GFP_THISNODE))
pol = &default_policy;
get_mems_allowed();
retry_cpuset:
cpuset_mems_cookie = get_mems_allowed();
/*
* No reference counting needed for current->mempolicy
* nor system default_policy
@ -1916,7 +1933,10 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
page = __alloc_pages_nodemask(gfp, order,
policy_zonelist(gfp, pol, numa_node_id()),
policy_nodemask(gfp, pol));
put_mems_allowed();
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
}
EXPORT_SYMBOL(alloc_pages_current);

36
mm/migrate.c
View File

@ -1174,20 +1174,17 @@ set_status:
* Migrate an array of page address onto an array of nodes and fill
* the corresponding array of status.
*/
static int do_pages_move(struct mm_struct *mm, struct task_struct *task,
static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
unsigned long nr_pages,
const void __user * __user *pages,
const int __user *nodes,
int __user *status, int flags)
{
struct page_to_node *pm;
nodemask_t task_nodes;
unsigned long chunk_nr_pages;
unsigned long chunk_start;
int err;
task_nodes = cpuset_mems_allowed(task);
err = -ENOMEM;
pm = (struct page_to_node *)__get_free_page(GFP_KERNEL);
if (!pm)
@ -1349,6 +1346,7 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
struct task_struct *task;
struct mm_struct *mm;
int err;
nodemask_t task_nodes;
/* Check flags */
if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL))
@ -1364,11 +1362,7 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
rcu_read_unlock();
return -ESRCH;
}
mm = get_task_mm(task);
rcu_read_unlock();
if (!mm)
return -EINVAL;
get_task_struct(task);
/*
* Check if this process has the right to modify the specified
@ -1376,7 +1370,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
* capabilities, superuser privileges or the same
* userid as the target process.
*/
rcu_read_lock();
tcred = __task_cred(task);
if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
cred->uid != tcred->suid && cred->uid != tcred->uid &&
@ -1391,15 +1384,24 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
if (err)
goto out;
if (nodes) {
err = do_pages_move(mm, task, nr_pages, pages, nodes, status,
flags);
} else {
err = do_pages_stat(mm, nr_pages, pages, status);
}
task_nodes = cpuset_mems_allowed(task);
mm = get_task_mm(task);
put_task_struct(task);
if (mm) {
if (nodes)
err = do_pages_move(mm, task_nodes, nr_pages, pages,
nodes, status, flags);
else
err = do_pages_stat(mm, nr_pages, pages, status);
} else
err = -EINVAL;
mmput(mm);
return err;
out:
mmput(mm);
put_task_struct(task);
return err;
}

2
mm/mincore.c
View File

@ -164,7 +164,7 @@ static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
}
/* fall through */
}
if (pmd_none_or_clear_bad(pmd))
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
mincore_unmapped_range(vma, addr, next, vec);
else
mincore_pte_range(vma, pmd, addr, next, vec);

51
mm/mmap.c
View File

@ -451,9 +451,8 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
}
/*
* Helper for vma_adjust in the split_vma insert case:
* insert vm structure into list and rbtree and anon_vma,
* but it has already been inserted into prio_tree earlier.
* Helper for vma_adjust() in the split_vma insert case: insert a vma into the
* mm's list and rbtree. It has already been inserted into the prio_tree.
*/
static void __insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
{
@ -1112,9 +1111,9 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
* A dummy user value is used because we are not locking
* memory so no accounting is necessary
*/
len = ALIGN(len, huge_page_size(&default_hstate));
file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE,
&user, HUGETLB_ANONHUGE_INODE);
file = hugetlb_file_setup(HUGETLB_ANON_FILE, addr, len,
VM_NORESERVE, &user,
HUGETLB_ANONHUGE_INODE);
if (IS_ERR(file))
return PTR_ERR(file);
}
@ -1439,10 +1438,8 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
/*
* Is this a new hole at the lowest possible address?
*/
if (addr >= TASK_UNMAPPED_BASE && addr < mm->free_area_cache) {
if (addr >= TASK_UNMAPPED_BASE && addr < mm->free_area_cache)
mm->free_area_cache = addr;
mm->cached_hole_size = ~0UL;
}
}
/*
@ -1457,7 +1454,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
unsigned long addr = addr0;
unsigned long addr = addr0, start_addr;
/* requested length too big for entire address space */
if (len > TASK_SIZE)
@ -1481,22 +1478,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
mm->free_area_cache = mm->mmap_base;
}
try_again:
/* either no address requested or can't fit in requested address hole */
addr = mm->free_area_cache;
start_addr = addr = mm->free_area_cache;
/* make sure it can fit in the remaining address space */
if (addr > len) {
vma = find_vma(mm, addr-len);
if (!vma || addr <= vma->vm_start)
/* remember the address as a hint for next time */
return (mm->free_area_cache = addr-len);
}
if (mm->mmap_base < len)
goto bottomup;
addr = mm->mmap_base-len;
if (addr < len)
goto fail;
addr -= len;
do {
/*
* Lookup failure means no vma is above this address,
@ -1516,7 +1505,21 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
addr = vma->vm_start-len;
} while (len < vma->vm_start);
bottomup:
fail:
/*
* if hint left us with no space for the requested
* mapping then try again:
*
* Note: this is different with the case of bottomup
* which does the fully line-search, but we use find_vma
* here that causes some holes skipped.
*/
if (start_addr != mm->mmap_base) {
mm->free_area_cache = mm->mmap_base;
mm->cached_hole_size = 0;
goto try_again;
}
/*
* A failed mmap() very likely causes application failure,
* so fall back to the bottom-up function here. This scenario

2
mm/mmu_context.c
View File

@ -53,7 +53,7 @@ void unuse_mm(struct mm_struct *mm)
struct task_struct *tsk = current;
task_lock(tsk);
sync_mm_rss(tsk, mm);
sync_mm_rss(mm);
tsk->mm = NULL;
/* active_mm is still 'mm' */
enter_lazy_tlb(mm, tsk);

2
mm/mprotect.c
View File

@ -60,7 +60,7 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
ptent = pte_mkwrite(ptent);
ptep_modify_prot_commit(mm, addr, pte, ptent);
} else if (PAGE_MIGRATION && !pte_file(oldpte)) {
} else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);
if (is_write_migration_entry(entry)) {

166
mm/oom_kill.c
View File

@ -34,6 +34,7 @@
#include <linux/ptrace.h>
#include <linux/freezer.h>
#include <linux/ftrace.h>
#include <linux/ratelimit.h>
#define CREATE_TRACE_POINTS
#include <trace/events/oom.h>
@ -309,7 +310,7 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
*/
static struct task_struct *select_bad_process(unsigned int *ppoints,
unsigned long totalpages, struct mem_cgroup *memcg,
const nodemask_t *nodemask)
const nodemask_t *nodemask, bool force_kill)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
@ -335,7 +336,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
if (unlikely(frozen(p)))
__thaw_task(p);
return ERR_PTR(-1UL);
if (!force_kill)
return ERR_PTR(-1UL);
}
if (!p->mm)
continue;
@ -353,7 +355,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
if (p == current) {
chosen = p;
*ppoints = 1000;
} else {
} else if (!force_kill) {
/*
* If this task is not being ptraced on exit,
* then wait for it to finish before killing
@ -434,66 +436,18 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
}
#define K(x) ((x) << (PAGE_SHIFT-10))
static int oom_kill_task(struct task_struct *p)
{
struct task_struct *q;
struct mm_struct *mm;
p = find_lock_task_mm(p);
if (!p)
return 1;
/* mm cannot be safely dereferenced after task_unlock(p) */
mm = p->mm;
pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
task_pid_nr(p), p->comm, K(p->mm->total_vm),
K(get_mm_counter(p->mm, MM_ANONPAGES)),
K(get_mm_counter(p->mm, MM_FILEPAGES)));
task_unlock(p);
/*
* Kill all user processes sharing p->mm in other thread groups, if any.
* They don't get access to memory reserves or a higher scheduler
* priority, though, to avoid depletion of all memory or task
* starvation. This prevents mm->mmap_sem livelock when an oom killed
* task cannot exit because it requires the semaphore and its contended
* by another thread trying to allocate memory itself. That thread will
* now get access to memory reserves since it has a pending fatal
* signal.
*/
for_each_process(q)
if (q->mm == mm && !same_thread_group(q, p) &&
!(q->flags & PF_KTHREAD)) {
if (q->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
continue;
task_lock(q); /* Protect ->comm from prctl() */
pr_err("Kill process %d (%s) sharing same memory\n",
task_pid_nr(q), q->comm);
task_unlock(q);
force_sig(SIGKILL, q);
}
set_tsk_thread_flag(p, TIF_MEMDIE);
force_sig(SIGKILL, p);
return 0;
}
#undef K
static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
unsigned int points, unsigned long totalpages,
struct mem_cgroup *memcg, nodemask_t *nodemask,
const char *message)
static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
unsigned int points, unsigned long totalpages,
struct mem_cgroup *memcg, nodemask_t *nodemask,
const char *message)
{
struct task_struct *victim = p;
struct task_struct *child;
struct task_struct *t = p;
struct mm_struct *mm;
unsigned int victim_points = 0;
if (printk_ratelimit())
dump_header(p, gfp_mask, order, memcg, nodemask);
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
/*
* If the task is already exiting, don't alarm the sysadmin or kill
@ -501,9 +455,12 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
*/
if (p->flags & PF_EXITING) {
set_tsk_thread_flag(p, TIF_MEMDIE);
return 0;
return;
}
if (__ratelimit(&oom_rs))
dump_header(p, gfp_mask, order, memcg, nodemask);
task_lock(p);
pr_err("%s: Kill process %d (%s) score %d or sacrifice child\n",
message, task_pid_nr(p), p->comm, points);
@ -533,8 +490,44 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
}
} while_each_thread(p, t);
return oom_kill_task(victim);
victim = find_lock_task_mm(victim);
if (!victim)
return;
/* mm cannot safely be dereferenced after task_unlock(victim) */
mm = victim->mm;
pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
K(get_mm_counter(victim->mm, MM_ANONPAGES)),
K(get_mm_counter(victim->mm, MM_FILEPAGES)));
task_unlock(victim);
/*
* Kill all user processes sharing victim->mm in other thread groups, if
* any. They don't get access to memory reserves, though, to avoid
* depletion of all memory. This prevents mm->mmap_sem livelock when an
* oom killed thread cannot exit because it requires the semaphore and
* its contended by another thread trying to allocate memory itself.
* That thread will now get access to memory reserves since it has a
* pending fatal signal.
*/
for_each_process(p)
if (p->mm == mm && !same_thread_group(p, victim) &&
!(p->flags & PF_KTHREAD)) {
if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
continue;
task_lock(p); /* Protect ->comm from prctl() */
pr_err("Kill process %d (%s) sharing same memory\n",
task_pid_nr(p), p->comm);
task_unlock(p);
force_sig(SIGKILL, p);
}
set_tsk_thread_flag(victim, TIF_MEMDIE);
force_sig(SIGKILL, victim);
}
#undef K
/*
* Determines whether the kernel must panic because of the panic_on_oom sysctl.
@ -561,7 +554,8 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
int order)
{
unsigned long limit;
unsigned int points = 0;
@ -577,18 +571,13 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
return;
}
check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL);
check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT;
read_lock(&tasklist_lock);
retry:
p = select_bad_process(&points, limit, memcg, NULL);
if (!p || PTR_ERR(p) == -1UL)
goto out;
if (oom_kill_process(p, gfp_mask, 0, points, limit, memcg, NULL,
"Memory cgroup out of memory"))
goto retry;
out:
p = select_bad_process(&points, limit, memcg, NULL, false);
if (p && PTR_ERR(p) != -1UL)
oom_kill_process(p, gfp_mask, order, points, limit, memcg, NULL,
"Memory cgroup out of memory");
read_unlock(&tasklist_lock);
}
#endif
@ -700,6 +689,7 @@ static void clear_system_oom(void)
* @gfp_mask: memory allocation flags
* @order: amount of memory being requested as a power of 2
* @nodemask: nodemask passed to page allocator
* @force_kill: true if a task must be killed, even if others are exiting
*
* If we run out of memory, we have the choice between either
* killing a random task (bad), letting the system crash (worse)
@ -707,7 +697,7 @@ static void clear_system_oom(void)
* don't have to be perfect here, we just have to be good.
*/
void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *nodemask)
int order, nodemask_t *nodemask, bool force_kill)
{
const nodemask_t *mpol_mask;
struct task_struct *p;
@ -745,33 +735,25 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
if (sysctl_oom_kill_allocating_task &&
!oom_unkillable_task(current, NULL, nodemask) &&
current->mm) {
/*
* oom_kill_process() needs tasklist_lock held. If it returns
* non-zero, current could not be killed so we must fallback to
* the tasklist scan.
*/
if (!oom_kill_process(current, gfp_mask, order, 0, totalpages,
NULL, nodemask,
"Out of memory (oom_kill_allocating_task)"))
goto out;
oom_kill_process(current, gfp_mask, order, 0, totalpages, NULL,
nodemask,
"Out of memory (oom_kill_allocating_task)");
goto out;
}
retry:
p = select_bad_process(&points, totalpages, NULL, mpol_mask);
if (PTR_ERR(p) == -1UL)
goto out;
p = select_bad_process(&points, totalpages, NULL, mpol_mask,
force_kill);
/* Found nothing?!?! Either we hang forever, or we panic. */
if (!p) {
dump_header(NULL, gfp_mask, order, NULL, mpol_mask);
read_unlock(&tasklist_lock);
panic("Out of memory and no killable processes...\n");
}
if (oom_kill_process(p, gfp_mask, order, points, totalpages, NULL,
nodemask, "Out of memory"))
goto retry;
killed = 1;
if (PTR_ERR(p) != -1UL) {
oom_kill_process(p, gfp_mask, order, points, totalpages, NULL,
nodemask, "Out of memory");
killed = 1;
}
out:
read_unlock(&tasklist_lock);
@ -792,7 +774,7 @@ out:
void pagefault_out_of_memory(void)
{
if (try_set_system_oom()) {
out_of_memory(NULL, 0, 0, NULL);
out_of_memory(NULL, 0, 0, NULL, false);
clear_system_oom();
}
if (!test_thread_flag(TIF_MEMDIE))

1
mm/page-writeback.c
View File

@ -1472,6 +1472,7 @@ void throttle_vm_writeout(gfp_t gfp_mask)
for ( ; ; ) {
global_dirty_limits(&background_thresh, &dirty_thresh);
dirty_thresh = hard_dirty_limit(dirty_thresh);
/*
* Boost the allowable dirty threshold a bit for page

58
mm/page_alloc.c
View File

@ -1968,7 +1968,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
goto out;
}
/* Exhausted what can be done so it's blamo time */
out_of_memory(zonelist, gfp_mask, order, nodemask);
out_of_memory(zonelist, gfp_mask, order, nodemask, false);
out:
clear_zonelist_oom(zonelist, gfp_mask);
@ -1990,7 +1990,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
if (!order)
return NULL;
if (compaction_deferred(preferred_zone)) {
if (compaction_deferred(preferred_zone, order)) {
*deferred_compaction = true;
return NULL;
}
@ -2012,6 +2012,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
if (page) {
preferred_zone->compact_considered = 0;
preferred_zone->compact_defer_shift = 0;
if (order >= preferred_zone->compact_order_failed)
preferred_zone->compact_order_failed = order + 1;
count_vm_event(COMPACTSUCCESS);
return page;
}
@ -2028,7 +2030,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
* defer if the failure was a sync compaction failure.
*/
if (sync_migration)
defer_compaction(preferred_zone);
defer_compaction(preferred_zone, order);
cond_resched();
}
@ -2378,8 +2380,9 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
{
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
struct zone *preferred_zone;
struct page *page;
struct page *page = NULL;
int migratetype = allocflags_to_migratetype(gfp_mask);
unsigned int cpuset_mems_cookie;
gfp_mask &= gfp_allowed_mask;
@ -2398,15 +2401,15 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
if (unlikely(!zonelist->_zonerefs->zone))
return NULL;
get_mems_allowed();
retry_cpuset:
cpuset_mems_cookie = get_mems_allowed();
/* The preferred zone is used for statistics later */
first_zones_zonelist(zonelist, high_zoneidx,
nodemask ? : &cpuset_current_mems_allowed,
&preferred_zone);
if (!preferred_zone) {
put_mems_allowed();
return NULL;
}
if (!preferred_zone)
goto out;
/* First allocation attempt */
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
@ -2416,9 +2419,19 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
page = __alloc_pages_slowpath(gfp_mask, order,
zonelist, high_zoneidx, nodemask,
preferred_zone, migratetype);
put_mems_allowed();
trace_mm_page_alloc(page, order, gfp_mask, migratetype);
out:
/*
* When updating a task's mems_allowed, it is possible to race with
* parallel threads in such a way that an allocation can fail while
* the mask is being updated. If a page allocation is about to fail,
* check if the cpuset changed during allocation and if so, retry.
*/
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
goto retry_cpuset;
return page;
}
EXPORT_SYMBOL(__alloc_pages_nodemask);
@ -2632,13 +2645,15 @@ void si_meminfo_node(struct sysinfo *val, int nid)
bool skip_free_areas_node(unsigned int flags, int nid)
{
bool ret = false;
unsigned int cpuset_mems_cookie;
if (!(flags & SHOW_MEM_FILTER_NODES))
goto out;
get_mems_allowed();
ret = !node_isset(nid, cpuset_current_mems_allowed);
put_mems_allowed();
do {
cpuset_mems_cookie = get_mems_allowed();
ret = !node_isset(nid, cpuset_current_mems_allowed);
} while (!put_mems_allowed(cpuset_mems_cookie));
out:
return ret;
}
@ -3925,18 +3940,6 @@ void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn)
}
}
int __init add_from_early_node_map(struct range *range, int az,
int nr_range, int nid)
{
unsigned long start_pfn, end_pfn;
int i;
/* need to go over early_node_map to find out good range for node */
for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL)
nr_range = add_range(range, az, nr_range, start_pfn, end_pfn);
return nr_range;
}
/**
* sparse_memory_present_with_active_regions - Call memory_present for each active range
* @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used.
@ -4521,7 +4524,7 @@ static unsigned long __init early_calculate_totalpages(void)
* memory. When they don't, some nodes will have more kernelcore than
* others
*/
static void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn)
static void __init find_zone_movable_pfns_for_nodes(void)
{
int i, nid;
unsigned long usable_startpfn;
@ -4713,7 +4716,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
/* Find the PFNs that ZONE_MOVABLE begins at in each node */
memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn));
find_zone_movable_pfns_for_nodes(zone_movable_pfn);
find_zone_movable_pfns_for_nodes();
/* Print out the zone ranges */
printk("Zone PFN ranges:\n");
@ -4823,6 +4826,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
int cpu = (unsigned long)hcpu;
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
lru_add_drain_cpu(cpu);
drain_pages(cpu);
/*

2
mm/pagewalk.c
View File

@ -59,7 +59,7 @@ again:
continue;
split_huge_page_pmd(walk->mm, pmd);
if (pmd_none_or_clear_bad(pmd))
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
goto again;
err = walk_pte_range(pmd, addr, next, walk);
if (err)

5
mm/pgtable-generic.c
View File

@ -70,10 +70,11 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
int young;
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
#else
BUG();
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
young = pmdp_test_and_clear_young(vma, address, pmdp);
if (young)
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);

70
mm/rmap.c
View File

@ -120,6 +120,21 @@ static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain)
kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain);
}
static void anon_vma_chain_link(struct vm_area_struct *vma,
struct anon_vma_chain *avc,
struct anon_vma *anon_vma)
{
avc->vma = vma;
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
/*
* It's critical to add new vmas to the tail of the anon_vma,
* see comment in huge_memory.c:__split_huge_page().
*/
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
}
/**
* anon_vma_prepare - attach an anon_vma to a memory region
* @vma: the memory region in question
@ -175,10 +190,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) {
vma->anon_vma = anon_vma;
avc->anon_vma = anon_vma;
avc->vma = vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
anon_vma_chain_link(vma, avc, anon_vma);
allocated = NULL;
avc = NULL;
}
@ -224,21 +236,6 @@ static inline void unlock_anon_vma_root(struct anon_vma *root)
mutex_unlock(&root->mutex);
}
static void anon_vma_chain_link(struct vm_area_struct *vma,
struct anon_vma_chain *avc,
struct anon_vma *anon_vma)
{
avc->vma = vma;
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
/*
* It's critical to add new vmas to the tail of the anon_vma,
* see comment in huge_memory.c:__split_huge_page().
*/
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
}
/*
* Attach the anon_vmas from src to dst.
* Returns 0 on success, -ENOMEM on failure.
@ -1151,10 +1148,15 @@ void page_add_new_anon_rmap(struct page *page,
*/
void page_add_file_rmap(struct page *page)
{
bool locked;
unsigned long flags;
mem_cgroup_begin_update_page_stat(page, &locked, &flags);
if (atomic_inc_and_test(&page->_mapcount)) {
__inc_zone_page_state(page, NR_FILE_MAPPED);
mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_MAPPED);
}
mem_cgroup_end_update_page_stat(page, &locked, &flags);
}
/**
@ -1165,9 +1167,21 @@ void page_add_file_rmap(struct page *page)
*/
void page_remove_rmap(struct page *page)
{
bool anon = PageAnon(page);
bool locked;
unsigned long flags;
/*
* The anon case has no mem_cgroup page_stat to update; but may
* uncharge_page() below, where the lock ordering can deadlock if
* we hold the lock against page_stat move: so avoid it on anon.
*/
if (!anon)
mem_cgroup_begin_update_page_stat(page, &locked, &flags);
/* page still mapped by someone else? */
if (!atomic_add_negative(-1, &page->_mapcount))
return;
goto out;
/*
* Now that the last pte has gone, s390 must transfer dirty
@ -1176,7 +1190,7 @@ void page_remove_rmap(struct page *page)
* not if it's in swapcache - there might be another pte slot
* containing the swap entry, but page not yet written to swap.
*/
if ((!PageAnon(page) || PageSwapCache(page)) &&
if ((!anon || PageSwapCache(page)) &&
page_test_and_clear_dirty(page_to_pfn(page), 1))
set_page_dirty(page);
/*
@ -1184,8 +1198,8 @@ void page_remove_rmap(struct page *page)
* and not charged by memcg for now.
*/
if (unlikely(PageHuge(page)))
return;
if (PageAnon(page)) {
goto out;
if (anon) {
mem_cgroup_uncharge_page(page);
if (!PageTransHuge(page))
__dec_zone_page_state(page, NR_ANON_PAGES);
@ -1205,6 +1219,9 @@ void page_remove_rmap(struct page *page)
* Leaving it set also helps swapoff to reinstate ptes
* faster for those pages still in swapcache.
*/
out:
if (!anon)
mem_cgroup_end_update_page_stat(page, &locked, &flags);
}
/*
@ -1282,7 +1299,7 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
}
dec_mm_counter(mm, MM_ANONPAGES);
inc_mm_counter(mm, MM_SWAPENTS);
} else if (PAGE_MIGRATION) {
} else if (IS_ENABLED(CONFIG_MIGRATION)) {
/*
* Store the pfn of the page in a special migration
* pte. do_swap_page() will wait until the migration
@ -1293,7 +1310,8 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
}
set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
BUG_ON(pte_file(*pte));
} else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) {
} else if (IS_ENABLED(CONFIG_MIGRATION) &&
(TTU_ACTION(flags) == TTU_MIGRATION)) {
/* Establish migration entry for a file page */
swp_entry_t entry;
entry = make_migration_entry(page, pte_write(pteval));
@ -1499,7 +1517,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
* locking requirements of exec(), migration skips
* temporary VMAs until after exec() completes.
*/
if (PAGE_MIGRATION && (flags & TTU_MIGRATION) &&
if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION) &&
is_vma_temporary_stack(vma))
continue;

88
mm/shmem.c
View File

@ -1178,6 +1178,12 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
static const struct inode_operations shmem_symlink_inode_operations;
static const struct inode_operations shmem_short_symlink_operations;
#ifdef CONFIG_TMPFS_XATTR
static int shmem_initxattrs(struct inode *, const struct xattr *, void *);
#else
#define shmem_initxattrs NULL
#endif
static int
shmem_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
@ -1490,7 +1496,7 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
if (inode) {
error = security_inode_init_security(inode, dir,
&dentry->d_name,
NULL, NULL);
shmem_initxattrs, NULL);
if (error) {
if (error != -EOPNOTSUPP) {
iput(inode);
@ -1630,7 +1636,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
return -ENOSPC;
error = security_inode_init_security(inode, dir, &dentry->d_name,
NULL, NULL);
shmem_initxattrs, NULL);
if (error) {
if (error != -EOPNOTSUPP) {
iput(inode);
@ -1704,6 +1710,66 @@ static void shmem_put_link(struct dentry *dentry, struct nameidata *nd, void *co
* filesystem level, though.
*/
/*
* Allocate new xattr and copy in the value; but leave the name to callers.
*/
static struct shmem_xattr *shmem_xattr_alloc(const void *value, size_t size)
{
struct shmem_xattr *new_xattr;
size_t len;
/* wrap around? */
len = sizeof(*new_xattr) + size;
if (len <= sizeof(*new_xattr))
return NULL;
new_xattr = kmalloc(len, GFP_KERNEL);
if (!new_xattr)
return NULL;
new_xattr->size = size;
memcpy(new_xattr->value, value, size);
return new_xattr;
}
/*
* Callback for security_inode_init_security() for acquiring xattrs.
*/
static int shmem_initxattrs(struct inode *inode,
const struct xattr *xattr_array,
void *fs_info)
{
struct shmem_inode_info *info = SHMEM_I(inode);
const struct xattr *xattr;
struct shmem_xattr *new_xattr;
size_t len;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
new_xattr = shmem_xattr_alloc(xattr->value, xattr->value_len);
if (!new_xattr)
return -ENOMEM;
len = strlen(xattr->name) + 1;
new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len,
GFP_KERNEL);
if (!new_xattr->name) {
kfree(new_xattr);
return -ENOMEM;
}
memcpy(new_xattr->name, XATTR_SECURITY_PREFIX,
XATTR_SECURITY_PREFIX_LEN);
memcpy(new_xattr->name + XATTR_SECURITY_PREFIX_LEN,
xattr->name, len);
spin_lock(&info->lock);
list_add(&new_xattr->list, &info->xattr_list);
spin_unlock(&info->lock);
}
return 0;
}
static int shmem_xattr_get(struct dentry *dentry, const char *name,
void *buffer, size_t size)
{
@ -1731,24 +1797,17 @@ static int shmem_xattr_get(struct dentry *dentry, const char *name,
return ret;
}
static int shmem_xattr_set(struct dentry *dentry, const char *name,
static int shmem_xattr_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
struct shmem_inode_info *info = SHMEM_I(inode);
struct shmem_xattr *xattr;
struct shmem_xattr *new_xattr = NULL;
size_t len;
int err = 0;
/* value == NULL means remove */
if (value) {
/* wrap around? */
len = sizeof(*new_xattr) + size;
if (len <= sizeof(*new_xattr))
return -ENOMEM;
new_xattr = kmalloc(len, GFP_KERNEL);
new_xattr = shmem_xattr_alloc(value, size);
if (!new_xattr)
return -ENOMEM;
@ -1757,9 +1816,6 @@ static int shmem_xattr_set(struct dentry *dentry, const char *name,
kfree(new_xattr);
return -ENOMEM;
}
new_xattr->size = size;
memcpy(new_xattr->value, value, size);
}
spin_lock(&info->lock);
@ -1858,7 +1914,7 @@ static int shmem_setxattr(struct dentry *dentry, const char *name,
if (size == 0)
value = ""; /* empty EA, do not remove */
return shmem_xattr_set(dentry, name, value, size, flags);
return shmem_xattr_set(dentry->d_inode, name, value, size, flags);
}
@ -1878,7 +1934,7 @@ static int shmem_removexattr(struct dentry *dentry, const char *name)
if (err)
return err;
return shmem_xattr_set(dentry, name, NULL, 0, XATTR_REPLACE);
return shmem_xattr_set(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
}
static bool xattr_is_trusted(const char *name)

13
mm/slab.c
View File

@ -3284,12 +3284,10 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
if (in_interrupt() || (flags & __GFP_THISNODE))
return NULL;
nid_alloc = nid_here = numa_mem_id();
get_mems_allowed();
if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD))
nid_alloc = cpuset_slab_spread_node();
else if (current->mempolicy)
nid_alloc = slab_node(current->mempolicy);
put_mems_allowed();
if (nid_alloc != nid_here)
return ____cache_alloc_node(cachep, flags, nid_alloc);
return NULL;
@ -3312,14 +3310,17 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
enum zone_type high_zoneidx = gfp_zone(flags);
void *obj = NULL;
int nid;
unsigned int cpuset_mems_cookie;
if (flags & __GFP_THISNODE)
return NULL;
get_mems_allowed();
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
retry_cpuset:
cpuset_mems_cookie = get_mems_allowed();
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
retry:
/*
* Look through allowed nodes for objects available
@ -3372,7 +3373,9 @@ retry:
}
}
}
put_mems_allowed();
if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !obj))
goto retry_cpuset;
return obj;
}

36
mm/slub.c
View File

@ -1581,6 +1581,7 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags,
struct zone *zone;
enum zone_type high_zoneidx = gfp_zone(flags);
void *object;
unsigned int cpuset_mems_cookie;
/*
* The defrag ratio allows a configuration of the tradeoffs between
@ -1604,23 +1605,32 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags,
get_cycles() % 1024 > s->remote_node_defrag_ratio)
return NULL;
get_mems_allowed();
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
struct kmem_cache_node *n;
do {
cpuset_mems_cookie = get_mems_allowed();
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
struct kmem_cache_node *n;
n = get_node(s, zone_to_nid(zone));
n = get_node(s, zone_to_nid(zone));
if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
n->nr_partial > s->min_partial) {
object = get_partial_node(s, n, c);
if (object) {
put_mems_allowed();
return object;
if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
n->nr_partial > s->min_partial) {
object = get_partial_node(s, n, c);
if (object) {
/*
* Return the object even if
* put_mems_allowed indicated that
* the cpuset mems_allowed was
* updated in parallel. It's a
* harmless race between the alloc
* and the cpuset update.
*/
put_mems_allowed(cpuset_mems_cookie);
return object;
}
}
}
}
put_mems_allowed();
} while (!put_mems_allowed(cpuset_mems_cookie));
#endif
return NULL;
}

30
mm/sparse.c
View File

@ -353,29 +353,21 @@ static void __init sparse_early_usemaps_alloc_node(unsigned long**usemap_map,
usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
usemap_count);
if (usemap) {
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
if (!present_section_nr(pnum))
continue;
usemap_map[pnum] = usemap;
usemap += size;
if (!usemap) {
usemap = alloc_bootmem_node(NODE_DATA(nodeid), size * usemap_count);
if (!usemap) {
printk(KERN_WARNING "%s: allocation failed\n", __func__);
return;
}
return;
}
usemap = alloc_bootmem_node(NODE_DATA(nodeid), size * usemap_count);
if (usemap) {
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
if (!present_section_nr(pnum))
continue;
usemap_map[pnum] = usemap;
usemap += size;
check_usemap_section_nr(nodeid, usemap_map[pnum]);
}
return;
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
if (!present_section_nr(pnum))
continue;
usemap_map[pnum] = usemap;
usemap += size;
check_usemap_section_nr(nodeid, usemap_map[pnum]);
}
printk(KERN_WARNING "%s: allocation failed\n", __func__);
}
#ifndef CONFIG_SPARSEMEM_VMEMMAP

4
mm/swap.c
View File

@ -496,7 +496,7 @@ static void lru_deactivate_fn(struct page *page, void *arg)
* Either "cpu" is the current CPU, and preemption has already been
* disabled; or "cpu" is being hot-unplugged, and is already dead.
*/
static void drain_cpu_pagevecs(int cpu)
void lru_add_drain_cpu(int cpu)
{
struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
struct pagevec *pvec;
@ -553,7 +553,7 @@ void deactivate_page(struct page *page)
void lru_add_drain(void)
{
drain_cpu_pagevecs(get_cpu());
lru_add_drain_cpu(get_cpu());
put_cpu();
}

24
mm/swap_state.c
View File

@ -372,25 +372,23 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask,
struct vm_area_struct *vma, unsigned long addr)
{
int nr_pages;
struct page *page;
unsigned long offset;
unsigned long end_offset;
unsigned long offset = swp_offset(entry);
unsigned long start_offset, end_offset;
unsigned long mask = (1UL << page_cluster) - 1;
/*
* Get starting offset for readaround, and number of pages to read.
* Adjust starting address by readbehind (for NUMA interleave case)?
* No, it's very unlikely that swap layout would follow vma layout,
* more likely that neighbouring swap pages came from the same node:
* so use the same "addr" to choose the same node for each swap read.
*/
nr_pages = valid_swaphandles(entry, &offset);
for (end_offset = offset + nr_pages; offset < end_offset; offset++) {
/* Read a page_cluster sized and aligned cluster around offset. */
start_offset = offset & ~mask;
end_offset = offset | mask;
if (!start_offset) /* First page is swap header. */
start_offset++;
for (offset = start_offset; offset <= end_offset ; offset++) {
/* Ok, do the async read-ahead now */
page = read_swap_cache_async(swp_entry(swp_type(entry), offset),
gfp_mask, vma, addr);
if (!page)
break;
continue;
page_cache_release(page);
}
lru_add_drain(); /* Push any new pages onto the LRU now */

58
mm/swapfile.c
View File

@ -932,9 +932,7 @@ static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (unlikely(pmd_trans_huge(*pmd)))
continue;
if (pmd_none_or_clear_bad(pmd))
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
ret = unuse_pte_range(vma, pmd, addr, next, entry, page);
if (ret)
@ -2107,7 +2105,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
p->flags |= SWP_SOLIDSTATE;
p->cluster_next = 1 + (random32() % p->highest_bit);
}
if (discard_swap(p) == 0 && (swap_flags & SWAP_FLAG_DISCARD))
if ((swap_flags & SWAP_FLAG_DISCARD) && discard_swap(p) == 0)
p->flags |= SWP_DISCARDABLE;
}
@ -2291,58 +2289,6 @@ int swapcache_prepare(swp_entry_t entry)
return __swap_duplicate(entry, SWAP_HAS_CACHE);
}
/*
* swap_lock prevents swap_map being freed. Don't grab an extra
* reference on the swaphandle, it doesn't matter if it becomes unused.
*/
int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
{
struct swap_info_struct *si;
int our_page_cluster = page_cluster;
pgoff_t target, toff;
pgoff_t base, end;
int nr_pages = 0;
if (!our_page_cluster) /* no readahead */
return 0;
si = swap_info[swp_type(entry)];
target = swp_offset(entry);
base = (target >> our_page_cluster) << our_page_cluster;
end = base + (1 << our_page_cluster);
if (!base) /* first page is swap header */
base++;
spin_lock(&swap_lock);
if (end > si->max) /* don't go beyond end of map */
end = si->max;
/* Count contiguous allocated slots above our target */
for (toff = target; ++toff < end; nr_pages++) {
/* Don't read in free or bad pages */
if (!si->swap_map[toff])
break;
if (swap_count(si->swap_map[toff]) == SWAP_MAP_BAD)
break;
}
/* Count contiguous allocated slots below our target */
for (toff = target; --toff >= base; nr_pages++) {
/* Don't read in free or bad pages */
if (!si->swap_map[toff])
break;
if (swap_count(si->swap_map[toff]) == SWAP_MAP_BAD)
break;
}
spin_unlock(&swap_lock);
/*
* Indicate starting offset, and return number of pages to get:
* if only 1, say 0, since there's then no readahead to be done.
*/
*offset = ++toff;
return nr_pages? ++nr_pages: 0;
}
/*
* add_swap_count_continuation - called when a swap count is duplicated
* beyond SWAP_MAP_MAX, it allocates a new page and links that to the entry's

41
mm/util.c
View File

@ -239,6 +239,47 @@ void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
next->vm_prev = vma;
}
/* Check if the vma is being used as a stack by this task */
static int vm_is_stack_for_task(struct task_struct *t,
struct vm_area_struct *vma)
{
return (vma->vm_start <= KSTK_ESP(t) && vma->vm_end >= KSTK_ESP(t));
}
/*
* Check if the vma is being used as a stack.
* If is_group is non-zero, check in the entire thread group or else
* just check in the current task. Returns the pid of the task that
* the vma is stack for.
*/
pid_t vm_is_stack(struct task_struct *task,
struct vm_area_struct *vma, int in_group)
{
pid_t ret = 0;
if (vm_is_stack_for_task(task, vma))
return task->pid;
if (in_group) {
struct task_struct *t;
rcu_read_lock();
if (!pid_alive(task))
goto done;
t = task;
do {
if (vm_is_stack_for_task(t, vma)) {
ret = t->pid;
goto done;
}
} while_each_thread(task, t);
done:
rcu_read_unlock();
}
return ret;
}
#if defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
void arch_pick_mmap_layout(struct mm_struct *mm)
{

151
mm/vmscan.c
View File

@ -1138,7 +1138,7 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
* @mz: The mem_cgroup_zone to pull pages from.
* @dst: The temp list to put pages on to.
* @nr_scanned: The number of pages that were scanned.
* @order: The caller's attempted allocation order
* @sc: The scan_control struct for this reclaim session
* @mode: One of the LRU isolation modes
* @active: True [1] if isolating active pages
* @file: True [1] if isolating file [!anon] pages
@ -1147,8 +1147,8 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
*/
static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
struct mem_cgroup_zone *mz, struct list_head *dst,
unsigned long *nr_scanned, int order, isolate_mode_t mode,
int active, int file)
unsigned long *nr_scanned, struct scan_control *sc,
isolate_mode_t mode, int active, int file)
{
struct lruvec *lruvec;
struct list_head *src;
@ -1194,7 +1194,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
BUG();
}
if (!order)
if (!sc->order || !(sc->reclaim_mode & RECLAIM_MODE_LUMPYRECLAIM))
continue;
/*
@ -1208,8 +1208,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
*/
zone_id = page_zone_id(page);
page_pfn = page_to_pfn(page);
pfn = page_pfn & ~((1 << order) - 1);
end_pfn = pfn + (1 << order);
pfn = page_pfn & ~((1 << sc->order) - 1);
end_pfn = pfn + (1 << sc->order);
for (; pfn < end_pfn; pfn++) {
struct page *cursor_page;
@ -1275,7 +1275,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
*nr_scanned = scan;
trace_mm_vmscan_lru_isolate(order,
trace_mm_vmscan_lru_isolate(sc->order,
nr_to_scan, scan,
nr_taken,
nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed,
@ -1413,7 +1413,6 @@ update_isolated_counts(struct mem_cgroup_zone *mz,
unsigned long *nr_anon,
unsigned long *nr_file)
{
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
struct zone *zone = mz->zone;
unsigned int count[NR_LRU_LISTS] = { 0, };
unsigned long nr_active = 0;
@ -1434,6 +1433,7 @@ update_isolated_counts(struct mem_cgroup_zone *mz,
count[lru] += numpages;
}
preempt_disable();
__count_vm_events(PGDEACTIVATE, nr_active);
__mod_zone_page_state(zone, NR_ACTIVE_FILE,
@ -1448,8 +1448,9 @@ update_isolated_counts(struct mem_cgroup_zone *mz,
*nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
*nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
reclaim_stat->recent_scanned[0] += *nr_anon;
reclaim_stat->recent_scanned[1] += *nr_file;
__mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file);
preempt_enable();
}
/*
@ -1509,8 +1510,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
unsigned long nr_file;
unsigned long nr_dirty = 0;
unsigned long nr_writeback = 0;
isolate_mode_t reclaim_mode = ISOLATE_INACTIVE;
isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
struct zone *zone = mz->zone;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
while (unlikely(too_many_isolated(zone, file, sc))) {
congestion_wait(BLK_RW_ASYNC, HZ/10);
@ -1522,20 +1524,19 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
set_reclaim_mode(priority, sc, false);
if (sc->reclaim_mode & RECLAIM_MODE_LUMPYRECLAIM)
reclaim_mode |= ISOLATE_ACTIVE;
isolate_mode |= ISOLATE_ACTIVE;
lru_add_drain();
if (!sc->may_unmap)
reclaim_mode |= ISOLATE_UNMAPPED;
isolate_mode |= ISOLATE_UNMAPPED;
if (!sc->may_writepage)
reclaim_mode |= ISOLATE_CLEAN;
isolate_mode |= ISOLATE_CLEAN;
spin_lock_irq(&zone->lru_lock);
nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list,
&nr_scanned, sc->order,
reclaim_mode, 0, file);
nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list, &nr_scanned,
sc, isolate_mode, 0, file);
if (global_reclaim(sc)) {
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
@ -1545,19 +1546,13 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
__count_zone_vm_events(PGSCAN_DIRECT, zone,
nr_scanned);
}
spin_unlock_irq(&zone->lru_lock);
if (nr_taken == 0) {
spin_unlock_irq(&zone->lru_lock);
if (nr_taken == 0)
return 0;
}
update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
__mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
spin_unlock_irq(&zone->lru_lock);
nr_reclaimed = shrink_page_list(&page_list, mz, sc, priority,
&nr_dirty, &nr_writeback);
@ -1570,6 +1565,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
spin_lock_irq(&zone->lru_lock);
reclaim_stat->recent_scanned[0] += nr_anon;
reclaim_stat->recent_scanned[1] += nr_file;
if (current_is_kswapd())
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
@ -1643,18 +1641,6 @@ static void move_active_pages_to_lru(struct zone *zone,
unsigned long pgmoved = 0;
struct page *page;
if (buffer_heads_over_limit) {
spin_unlock_irq(&zone->lru_lock);
list_for_each_entry(page, list, lru) {
if (page_has_private(page) && trylock_page(page)) {
if (page_has_private(page))
try_to_release_page(page, 0);
unlock_page(page);
}
}
spin_lock_irq(&zone->lru_lock);
}
while (!list_empty(list)) {
struct lruvec *lruvec;
@ -1699,21 +1685,22 @@ static void shrink_active_list(unsigned long nr_to_scan,
struct page *page;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
unsigned long nr_rotated = 0;
isolate_mode_t reclaim_mode = ISOLATE_ACTIVE;
isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
struct zone *zone = mz->zone;
lru_add_drain();
reset_reclaim_mode(sc);
if (!sc->may_unmap)
reclaim_mode |= ISOLATE_UNMAPPED;
isolate_mode |= ISOLATE_UNMAPPED;
if (!sc->may_writepage)
reclaim_mode |= ISOLATE_CLEAN;
isolate_mode |= ISOLATE_CLEAN;
spin_lock_irq(&zone->lru_lock);
nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold,
&nr_scanned, sc->order,
reclaim_mode, 1, file);
nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold, &nr_scanned, sc,
isolate_mode, 1, file);
if (global_reclaim(sc))
zone->pages_scanned += nr_scanned;
@ -1737,6 +1724,14 @@ static void shrink_active_list(unsigned long nr_to_scan,
continue;
}
if (unlikely(buffer_heads_over_limit)) {
if (page_has_private(page) && trylock_page(page)) {
if (page_has_private(page))
try_to_release_page(page, 0);
unlock_page(page);
}
}
if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) {
nr_rotated += hpage_nr_pages(page);
/*
@ -2112,7 +2107,12 @@ restart:
* with multiple processes reclaiming pages, the total
* freeing target can get unreasonably large.
*/
if (nr_reclaimed >= nr_to_reclaim && priority < DEF_PRIORITY)
if (nr_reclaimed >= nr_to_reclaim)
nr_to_reclaim = 0;
else
nr_to_reclaim -= nr_reclaimed;
if (!nr_to_reclaim && priority < DEF_PRIORITY)
break;
}
blk_finish_plug(&plug);
@ -2195,7 +2195,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
* If compaction is deferred, reclaim up to a point where
* compaction will have a chance of success when re-enabled
*/
if (compaction_deferred(zone))
if (compaction_deferred(zone, sc->order))
return watermark_ok;
/* If compaction is not ready to start, keep reclaiming */
@ -2235,6 +2235,14 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
unsigned long nr_soft_scanned;
bool aborted_reclaim = false;
/*
* If the number of buffer_heads in the machine exceeds the maximum
* allowed level, force direct reclaim to scan the highmem zone as
* highmem pages could be pinning lowmem pages storing buffer_heads
*/
if (buffer_heads_over_limit)
sc->gfp_mask |= __GFP_HIGHMEM;
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
if (!populated_zone(zone))
@ -2255,8 +2263,8 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
* Even though compaction is invoked for any
* non-zero order, only frequent costly order
* reclamation is disruptive enough to become a
* noticable problem, like transparent huge page
* allocations.
* noticeable problem, like transparent huge
* page allocations.
*/
if (compaction_ready(zone, sc)) {
aborted_reclaim = true;
@ -2337,7 +2345,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
unsigned long writeback_threshold;
bool aborted_reclaim;
get_mems_allowed();
delayacct_freepages_start();
if (global_reclaim(sc))
@ -2401,7 +2408,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
out:
delayacct_freepages_end();
put_mems_allowed();
if (sc->nr_reclaimed)
return sc->nr_reclaimed;
@ -2724,6 +2730,17 @@ loop_again:
*/
age_active_anon(zone, &sc, priority);
/*
* If the number of buffer_heads in the machine
* exceeds the maximum allowed level and this node
* has a highmem zone, force kswapd to reclaim from
* it to relieve lowmem pressure.
*/
if (buffer_heads_over_limit && is_highmem_idx(i)) {
end_zone = i;
break;
}
if (!zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone), 0, 0)) {
end_zone = i;
@ -2753,7 +2770,7 @@ loop_again:
*/
for (i = 0; i <= end_zone; i++) {
struct zone *zone = pgdat->node_zones + i;
int nr_slab;
int nr_slab, testorder;
unsigned long balance_gap;
if (!populated_zone(zone))
@ -2786,7 +2803,21 @@ loop_again:
(zone->present_pages +
KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
KSWAPD_ZONE_BALANCE_GAP_RATIO);
if (!zone_watermark_ok_safe(zone, order,
/*
* Kswapd reclaims only single pages with compaction
* enabled. Trying too hard to reclaim until contiguous
* free pages have become available can hurt performance
* by evicting too much useful data from memory.
* Do not reclaim more than needed for compaction.
*/
testorder = order;
if (COMPACTION_BUILD && order &&
compaction_suitable(zone, order) !=
COMPACT_SKIPPED)
testorder = 0;
if ((buffer_heads_over_limit && is_highmem_idx(i)) ||
!zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone) + balance_gap,
end_zone, 0)) {
shrink_zone(priority, zone, &sc);
@ -2815,7 +2846,7 @@ loop_again:
continue;
}
if (!zone_watermark_ok_safe(zone, order,
if (!zone_watermark_ok_safe(zone, testorder,
high_wmark_pages(zone), end_zone, 0)) {
all_zones_ok = 0;
/*
@ -2903,6 +2934,8 @@ out:
* and it is potentially going to sleep here.
*/
if (order) {
int zones_need_compaction = 1;
for (i = 0; i <= end_zone; i++) {
struct zone *zone = pgdat->node_zones + i;
@ -2912,6 +2945,10 @@ out:
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
continue;
/* Would compaction fail due to lack of free memory? */
if (compaction_suitable(zone, order) == COMPACT_SKIPPED)
goto loop_again;
/* Confirm the zone is balanced for order-0 */
if (!zone_watermark_ok(zone, 0,
high_wmark_pages(zone), 0, 0)) {
@ -2919,11 +2956,17 @@ out:
goto loop_again;
}
/* Check if the memory needs to be defragmented. */
if (zone_watermark_ok(zone, order,
low_wmark_pages(zone), *classzone_idx, 0))
zones_need_compaction = 0;
/* If balanced, clear the congested flag */
zone_clear_flag(zone, ZONE_CONGESTED);
if (i <= *classzone_idx)
balanced += zone->present_pages;
}
if (zones_need_compaction)
compact_pgdat(pgdat, order);
}
/*