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mm/khugepaged: rename prefix of shared collapse functions

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The following functions are shared between khugepaged and madvise collapse
contexts.  Replace the "khugepaged_" prefix with generic "hpage_collapse_"
prefix in such cases:

khugepaged_test_exit() -> hpage_collapse_test_exit()
khugepaged_scan_abort() -> hpage_collapse_scan_abort()
khugepaged_scan_pmd() -> hpage_collapse_scan_pmd()
khugepaged_find_target_node() -> hpage_collapse_find_target_node()
khugepaged_alloc_page() -> hpage_collapse_alloc_page()

The kerenel ABI (e.g.  huge_memory:mm_khugepaged_scan_pmd tracepoint) is
unaltered.

Link: https://lkml.kernel.org/r/20220706235936.2197195-11-zokeefe@google.com
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Chris Kennelly <ckennelly@google.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Souptick Joarder (HPE)" <jrdr.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zach O'Keefe 2022-07-06 16:59:28 -07:00 committed by Andrew Morton
parent 7d8faaf155
commit 7d2c4385c3
1 changed files with 35 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
mm/khugepaged.c
View File

@ -94,7 +94,7 @@ struct collapse_control {
/* Num pages scanned per node */
u32 node_load[MAX_NUMNODES];
/* Last target selected in khugepaged_find_target_node() */
/* Last target selected in hpage_collapse_find_target_node() */
int last_target_node;
};
@ -438,7 +438,7 @@ static void insert_to_mm_slots_hash(struct mm_struct *mm,
hash_add(mm_slots_hash, &mm_slot->hash, (long)mm);
}
static inline int khugepaged_test_exit(struct mm_struct *mm)
static inline int hpage_collapse_test_exit(struct mm_struct *mm)
{
return atomic_read(&mm->mm_users) == 0;
}
@ -453,7 +453,7 @@ void __khugepaged_enter(struct mm_struct *mm)
return;
/* __khugepaged_exit() must not run from under us */
VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
VM_BUG_ON_MM(hpage_collapse_test_exit(mm), mm);
if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) {
free_mm_slot(mm_slot);
return;
@ -505,11 +505,10 @@ void __khugepaged_exit(struct mm_struct *mm)
} else if (mm_slot) {
/*
* This is required to serialize against
* khugepaged_test_exit() (which is guaranteed to run
* under mmap sem read mode). Stop here (after we
* return all pagetables will be destroyed) until
* khugepaged has finished working on the pagetables
* under the mmap_lock.
* hpage_collapse_test_exit() (which is guaranteed to run
* under mmap sem read mode). Stop here (after we return all
* pagetables will be destroyed) until khugepaged has finished
* working on the pagetables under the mmap_lock.
*/
mmap_write_lock(mm);
mmap_write_unlock(mm);
@ -758,13 +757,12 @@ static void khugepaged_alloc_sleep(void)
remove_wait_queue(&khugepaged_wait, &wait);
}
struct collapse_control khugepaged_collapse_control = {
.is_khugepaged = true,
.last_target_node = NUMA_NO_NODE,
};
static bool khugepaged_scan_abort(int nid, struct collapse_control *cc)
static bool hpage_collapse_scan_abort(int nid, struct collapse_control *cc)
{
int i;
@ -799,7 +797,7 @@ static inline gfp_t alloc_hugepage_khugepaged_gfpmask(void)
}
#ifdef CONFIG_NUMA
static int khugepaged_find_target_node(struct collapse_control *cc)
static int hpage_collapse_find_target_node(struct collapse_control *cc)
{
int nid, target_node = 0, max_value = 0;
@ -823,13 +821,13 @@ static int khugepaged_find_target_node(struct collapse_control *cc)
return target_node;
}
#else
static int khugepaged_find_target_node(struct collapse_control *cc)
static int hpage_collapse_find_target_node(struct collapse_control *cc)
{
return 0;
}
#endif
static bool khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
static bool hpage_collapse_alloc_page(struct page **hpage, gfp_t gfp, int node)
{
*hpage = __alloc_pages_node(node, gfp, HPAGE_PMD_ORDER);
if (unlikely(!*hpage)) {
@ -854,7 +852,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
{
struct vm_area_struct *vma;
if (unlikely(khugepaged_test_exit(mm)))
if (unlikely(hpage_collapse_test_exit(mm)))
return SCAN_ANY_PROCESS;
*vmap = vma = find_vma(mm, address);
@ -919,7 +917,7 @@ static int check_pmd_still_valid(struct mm_struct *mm,
/*
* Bring missing pages in from swap, to complete THP collapse.
* Only done if khugepaged_scan_pmd believes it is worthwhile.
* Only done if hpage_collapse_scan_pmd believes it is worthwhile.
*
* Called and returns without pte mapped or spinlocks held.
* Note that if false is returned, mmap_lock will be released.
@ -984,9 +982,9 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
/* Only allocate from the target node */
gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
GFP_TRANSHUGE) | __GFP_THISNODE;
int node = khugepaged_find_target_node(cc);
int node = hpage_collapse_find_target_node(cc);
if (!khugepaged_alloc_page(hpage, gfp, node))
if (!hpage_collapse_alloc_page(hpage, gfp, node))
return SCAN_ALLOC_HUGE_PAGE_FAIL;
if (unlikely(mem_cgroup_charge(page_folio(*hpage), mm, gfp)))
return SCAN_CGROUP_CHARGE_FAIL;
@ -1146,9 +1144,10 @@ out_nolock:
return result;
}
static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, bool *mmap_locked,
struct collapse_control *cc)
static int hpage_collapse_scan_pmd(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address, bool *mmap_locked,
struct collapse_control *cc)
{
pmd_t *pmd;
pte_t *pte, *_pte;
@ -1244,7 +1243,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
* hit record.
*/
node = page_to_nid(page);
if (khugepaged_scan_abort(node, cc)) {
if (hpage_collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
goto out_unmap;
}
@ -1323,7 +1322,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
lockdep_assert_held(&khugepaged_mm_lock);
if (khugepaged_test_exit(mm)) {
if (hpage_collapse_test_exit(mm)) {
/* free mm_slot */
hash_del(&mm_slot->hash);
list_del(&mm_slot->mm_node);
@ -1496,7 +1495,7 @@ static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
if (!mmap_write_trylock(mm))
return;
if (unlikely(khugepaged_test_exit(mm)))
if (unlikely(hpage_collapse_test_exit(mm)))
goto out;
for (i = 0; i < mm_slot->nr_pte_mapped_thp; i++)
@ -1558,7 +1557,8 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* it'll always mapped in small page size for uffd-wp
* registered ranges.
*/
if (!khugepaged_test_exit(mm) && !userfaultfd_wp(vma))
if (!hpage_collapse_test_exit(mm) &&
!userfaultfd_wp(vma))
collapse_and_free_pmd(mm, vma, addr, pmd);
mmap_write_unlock(mm);
} else {
@ -1986,7 +1986,7 @@ static int khugepaged_scan_file(struct mm_struct *mm, struct file *file,
}
node = page_to_nid(page);
if (khugepaged_scan_abort(node, cc)) {
if (hpage_collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
break;
}
@ -2076,7 +2076,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
vma = NULL;
if (unlikely(!mmap_read_trylock(mm)))
goto breakouterloop_mmap_lock;
if (likely(!khugepaged_test_exit(mm)))
if (likely(!hpage_collapse_test_exit(mm)))
vma = find_vma(mm, khugepaged_scan.address);
progress++;
@ -2084,7 +2084,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
unsigned long hstart, hend;
cond_resched();
if (unlikely(khugepaged_test_exit(mm))) {
if (unlikely(hpage_collapse_test_exit(mm))) {
progress++;
break;
}
@ -2105,7 +2105,7 @@ skip:
bool mmap_locked = true;
cond_resched();
if (unlikely(khugepaged_test_exit(mm)))
if (unlikely(hpage_collapse_test_exit(mm)))
goto breakouterloop;
VM_BUG_ON(khugepaged_scan.address < hstart ||
@ -2122,9 +2122,10 @@ skip:
mmap_locked = false;
fput(file);
} else {
*result = khugepaged_scan_pmd(mm, vma,
khugepaged_scan.address,
&mmap_locked, cc);
*result = hpage_collapse_scan_pmd(mm, vma,
khugepaged_scan.address,
&mmap_locked,
cc);
}
if (*result == SCAN_SUCCEED)
++khugepaged_pages_collapsed;
@ -2154,7 +2155,7 @@ breakouterloop_mmap_lock:
* Release the current mm_slot if this mm is about to die, or
* if we scanned all vmas of this mm.
*/
if (khugepaged_test_exit(mm) || !vma) {
if (hpage_collapse_test_exit(mm) || !vma) {
/*
* Make sure that if mm_users is reaching zero while
* khugepaged runs here, khugepaged_exit will find
@ -2438,7 +2439,8 @@ int madvise_collapse(struct vm_area_struct *vma, struct vm_area_struct **prev,
}
mmap_assert_locked(mm);
memset(cc->node_load, 0, sizeof(cc->node_load));
result = khugepaged_scan_pmd(mm, vma, addr, &mmap_locked, cc);
result = hpage_collapse_scan_pmd(mm, vma, addr, &mmap_locked,
cc);
if (!mmap_locked)
*prev = NULL; /* Tell caller we dropped mmap_lock */