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mm: memcontrol: use page lists for uncharge batching

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Pages are now uncharged at release time, and all sources of batched
uncharges operate on lists of pages.  Directly use those lists, and
get rid of the per-task batching state.

This also batches statistics accounting, in addition to the res
counter charges, to reduce IRQ-disabling and re-enabling.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2014-08-08 14:19:24 -07:00 committed by Linus Torvalds
parent 0a31bc97c8
commit 747db954ca
6 changed files with 117 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/memcontrol.h
View File

@ -59,12 +59,8 @@ int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
bool lrucare);
void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg);
void mem_cgroup_uncharge(struct page *page);
/* Batched uncharging */
void mem_cgroup_uncharge_start(void);
void mem_cgroup_uncharge_end(void);
void mem_cgroup_uncharge_list(struct list_head *page_list);
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
bool lrucare);
@ -233,11 +229,7 @@ static inline void mem_cgroup_uncharge(struct page *page)
{
}
static inline void mem_cgroup_uncharge_start(void)
{
}
static inline void mem_cgroup_uncharge_end(void)
static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
{
}

6
include/linux/sched.h
View File

@ -1628,12 +1628,6 @@ struct task_struct {
unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
#ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
struct memcg_batch_info {
int do_batch; /* incremented when batch uncharge started */
struct mem_cgroup *memcg; /* target memcg of uncharge */
unsigned long nr_pages; /* uncharged usage */
unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
} memcg_batch;
unsigned int memcg_kmem_skip_account;
struct memcg_oom_info {
struct mem_cgroup *memcg;

4
kernel/fork.c
View File

@ -1346,10 +1346,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
#ifdef CONFIG_MEMCG
p->memcg_batch.do_batch = 0;
p->memcg_batch.memcg = NULL;
#endif
#ifdef CONFIG_BCACHE
p->sequential_io = 0;
p->sequential_io_avg = 0;

206
mm/memcontrol.c
View File

@ -3581,53 +3581,6 @@ out:
return ret;
}
/*
* Batch_start/batch_end is called in unmap_page_range/invlidate/trucate.
* In that cases, pages are freed continuously and we can expect pages
* are in the same memcg. All these calls itself limits the number of
* pages freed at once, then uncharge_start/end() is called properly.
* This may be called prural(2) times in a context,
*/
void mem_cgroup_uncharge_start(void)
{
unsigned long flags;
local_irq_save(flags);
current->memcg_batch.do_batch++;
/* We can do nest. */
if (current->memcg_batch.do_batch == 1) {
current->memcg_batch.memcg = NULL;
current->memcg_batch.nr_pages = 0;
current->memcg_batch.memsw_nr_pages = 0;
}
local_irq_restore(flags);
}
void mem_cgroup_uncharge_end(void)
{
struct memcg_batch_info *batch = &current->memcg_batch;
unsigned long flags;
local_irq_save(flags);
VM_BUG_ON(!batch->do_batch);
if (--batch->do_batch) /* If stacked, do nothing */
goto out;
/*
* This "batch->memcg" is valid without any css_get/put etc...
* bacause we hide charges behind us.
*/
if (batch->nr_pages)
res_counter_uncharge(&batch->memcg->res,
batch->nr_pages * PAGE_SIZE);
if (batch->memsw_nr_pages)
res_counter_uncharge(&batch->memcg->memsw,
batch->memsw_nr_pages * PAGE_SIZE);
memcg_oom_recover(batch->memcg);
out:
local_irq_restore(flags);
}
#ifdef CONFIG_MEMCG_SWAP
static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
bool charge)
@ -6554,6 +6507,98 @@ void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg)
cancel_charge(memcg, nr_pages);
}
static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
unsigned long nr_mem, unsigned long nr_memsw,
unsigned long nr_anon, unsigned long nr_file,
unsigned long nr_huge, struct page *dummy_page)
{
unsigned long flags;
if (nr_mem)
res_counter_uncharge(&memcg->res, nr_mem * PAGE_SIZE);
if (nr_memsw)
res_counter_uncharge(&memcg->memsw, nr_memsw * PAGE_SIZE);
memcg_oom_recover(memcg);
local_irq_save(flags);
__this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS], nr_anon);
__this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
__this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
__this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
__this_cpu_add(memcg->stat->nr_page_events, nr_anon + nr_file);
memcg_check_events(memcg, dummy_page);
local_irq_restore(flags);
}
static void uncharge_list(struct list_head *page_list)
{
struct mem_cgroup *memcg = NULL;
unsigned long nr_memsw = 0;
unsigned long nr_anon = 0;
unsigned long nr_file = 0;
unsigned long nr_huge = 0;
unsigned long pgpgout = 0;
unsigned long nr_mem = 0;
struct list_head *next;
struct page *page;
next = page_list->next;
do {
unsigned int nr_pages = 1;
struct page_cgroup *pc;
page = list_entry(next, struct page, lru);
next = page->lru.next;
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(page_count(page), page);
pc = lookup_page_cgroup(page);
if (!PageCgroupUsed(pc))
continue;
/*
* Nobody should be changing or seriously looking at
* pc->mem_cgroup and pc->flags at this point, we have
* fully exclusive access to the page.
*/
if (memcg != pc->mem_cgroup) {
if (memcg) {
uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
nr_anon, nr_file, nr_huge, page);
pgpgout = nr_mem = nr_memsw = 0;
nr_anon = nr_file = nr_huge = 0;
}
memcg = pc->mem_cgroup;
}
if (PageTransHuge(page)) {
nr_pages <<= compound_order(page);
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
nr_huge += nr_pages;
}
if (PageAnon(page))
nr_anon += nr_pages;
else
nr_file += nr_pages;
if (pc->flags & PCG_MEM)
nr_mem += nr_pages;
if (pc->flags & PCG_MEMSW)
nr_memsw += nr_pages;
pc->flags = 0;
pgpgout++;
} while (next != page_list);
if (memcg)
uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
nr_anon, nr_file, nr_huge, page);
}
/**
* mem_cgroup_uncharge - uncharge a page
* @page: page to uncharge
@ -6563,67 +6608,34 @@ void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg)
*/
void mem_cgroup_uncharge(struct page *page)
{
struct memcg_batch_info *batch;
unsigned int nr_pages = 1;
struct mem_cgroup *memcg;
struct page_cgroup *pc;
unsigned long pc_flags;
unsigned long flags;
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(page_count(page), page);
if (mem_cgroup_disabled())
return;
/* Don't touch page->lru of any random page, pre-check: */
pc = lookup_page_cgroup(page);
/* Every final put_page() ends up here */
if (!PageCgroupUsed(pc))
return;
if (PageTransHuge(page)) {
nr_pages <<= compound_order(page);
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
}
/*
* Nobody should be changing or seriously looking at
* pc->mem_cgroup and pc->flags at this point, we have fully
* exclusive access to the page.
*/
memcg = pc->mem_cgroup;
pc_flags = pc->flags;
pc->flags = 0;
INIT_LIST_HEAD(&page->lru);
uncharge_list(&page->lru);
}
local_irq_save(flags);
/**
* mem_cgroup_uncharge_list - uncharge a list of page
* @page_list: list of pages to uncharge
*
* Uncharge a list of pages previously charged with
* mem_cgroup_try_charge() and mem_cgroup_commit_charge().
*/
void mem_cgroup_uncharge_list(struct list_head *page_list)
{
if (mem_cgroup_disabled())
return;
if (nr_pages > 1)
goto direct;
if (unlikely(test_thread_flag(TIF_MEMDIE)))
goto direct;
batch = &current->memcg_batch;
if (!batch->do_batch)
goto direct;
if (batch->memcg && batch->memcg != memcg)
goto direct;
if (!batch->memcg)
batch->memcg = memcg;
if (pc_flags & PCG_MEM)
batch->nr_pages++;
if (pc_flags & PCG_MEMSW)
batch->memsw_nr_pages++;
goto out;
direct:
if (pc_flags & PCG_MEM)
res_counter_uncharge(&memcg->res, nr_pages * PAGE_SIZE);
if (pc_flags & PCG_MEMSW)
res_counter_uncharge(&memcg->memsw, nr_pages * PAGE_SIZE);
memcg_oom_recover(memcg);
out:
mem_cgroup_charge_statistics(memcg, page, -nr_pages);
memcg_check_events(memcg, page);
local_irq_restore(flags);
if (!list_empty(page_list))
uncharge_list(page_list);
}
/**

6
mm/swap.c
View File

@ -908,8 +908,6 @@ void release_pages(struct page **pages, int nr, bool cold)
struct lruvec *lruvec;
unsigned long uninitialized_var(flags);
mem_cgroup_uncharge_start();
for (i = 0; i < nr; i++) {
struct page *page = pages[i];
@ -941,7 +939,6 @@ void release_pages(struct page **pages, int nr, bool cold)
__ClearPageLRU(page);
del_page_from_lru_list(page, lruvec, page_off_lru(page));
}
mem_cgroup_uncharge(page);
/* Clear Active bit in case of parallel mark_page_accessed */
__ClearPageActive(page);
@ -951,8 +948,7 @@ void release_pages(struct page **pages, int nr, bool cold)
if (zone)
spin_unlock_irqrestore(&zone->lru_lock, flags);
mem_cgroup_uncharge_end();
mem_cgroup_uncharge_list(&pages_to_free);
free_hot_cold_page_list(&pages_to_free, cold);
}
EXPORT_SYMBOL(release_pages);

12
mm/vmscan.c
View File

@ -822,7 +822,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
cond_resched();
mem_cgroup_uncharge_start();
while (!list_empty(page_list)) {
struct address_space *mapping;
struct page *page;
@ -1103,7 +1102,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
*/
__clear_page_locked(page);
free_it:
mem_cgroup_uncharge(page);
nr_reclaimed++;
/*
@ -1133,8 +1131,8 @@ keep:
list_add(&page->lru, &ret_pages);
VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page), page);
}
mem_cgroup_uncharge_end();
mem_cgroup_uncharge_list(&free_pages);
free_hot_cold_page_list(&free_pages, true);
list_splice(&ret_pages, page_list);
@ -1437,10 +1435,9 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
__ClearPageActive(page);
del_page_from_lru_list(page, lruvec, lru);
mem_cgroup_uncharge(page);
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
mem_cgroup_uncharge(page);
(*get_compound_page_dtor(page))(page);
spin_lock_irq(&zone->lru_lock);
} else
@ -1548,6 +1545,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
spin_unlock_irq(&zone->lru_lock);
mem_cgroup_uncharge_list(&page_list);
free_hot_cold_page_list(&page_list, true);
/*
@ -1660,10 +1658,9 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
__ClearPageActive(page);
del_page_from_lru_list(page, lruvec, lru);
mem_cgroup_uncharge(page);
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
mem_cgroup_uncharge(page);
(*get_compound_page_dtor(page))(page);
spin_lock_irq(&zone->lru_lock);
} else
@ -1771,6 +1768,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);
mem_cgroup_uncharge_list(&l_hold);
free_hot_cold_page_list(&l_hold, true);
}