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per-zone and reclaim enhancements for memory controller: per-zone-lock for cgroup

Browse source 
Now, lru is per-zone.

Then, lru_lock can be (should be) per-zone, too.
This patch implementes per-zone lru lock.

lru_lock is placed into mem_cgroup_per_zone struct.

lock can be accessed by
   mz = mem_cgroup_zoneinfo(mem_cgroup, node, zone);
   &mz->lru_lock

   or
   mz = page_cgroup_zoneinfo(page_cgroup);
   &mz->lru_lock

Signed-off-by: KAMEZAWA hiroyuki <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Herbert Poetzl <[email protected]>
Cc: Kirill Korotaev <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: Pavel Emelianov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Vaidyanathan Srinivasan <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2008-02-07 00:14:39 -08:00 • committed by Linus Torvalds
commit 072c56c13e
1 changed files with 44 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

71
mm/memcontrol.c
View file

@ -89,6 +89,10 @@ enum mem_cgroup_zstat_index {
};
struct mem_cgroup_per_zone {
/*
* spin_lock to protect the per cgroup LRU
*/
spinlock_t lru_lock;
struct list_head active_list;
struct list_head inactive_list;
unsigned long count[NR_MEM_CGROUP_ZSTAT];
@ -126,10 +130,7 @@ struct mem_cgroup {
* per zone LRU lists.
*/
struct mem_cgroup_lru_info info;
/*
* spin_lock to protect the per cgroup LRU
*/
spinlock_t lru_lock;
unsigned long control_type; /* control RSS or RSS+Pagecache */
int prev_priority; /* for recording reclaim priority */
/*
@ -409,15 +410,16 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
*/
void mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
{
struct mem_cgroup *mem;
struct mem_cgroup_per_zone *mz;
unsigned long flags;
if (!pc)
return;
mem = pc->mem_cgroup;
spin_lock(&mem->lru_lock);
mz = page_cgroup_zoneinfo(pc);
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_move_lists(pc, active);
spin_unlock(&mem->lru_lock);
spin_unlock_irqrestore(&mz->lru_lock, flags);
}
/*
@ -527,7 +529,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
src = &mz->inactive_list;
spin_lock(&mem_cont->lru_lock);
spin_lock(&mz->lru_lock);
scan = 0;
list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
if (scan >= nr_to_scan)
@ -557,7 +559,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
}
list_splice(&pc_list, src);
spin_unlock(&mem_cont->lru_lock);
spin_unlock(&mz->lru_lock);
*scanned = scan;
return nr_taken;
@ -576,6 +578,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
struct page_cgroup *pc;
unsigned long flags;
unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
struct mem_cgroup_per_zone *mz;
/*
* Should page_cgroup's go to their own slab?
@ -677,10 +680,11 @@ retry:
goto retry;
}
spin_lock_irqsave(&mem->lru_lock, flags);
mz = page_cgroup_zoneinfo(pc);
spin_lock_irqsave(&mz->lru_lock, flags);
/* Update statistics vector */
__mem_cgroup_add_list(pc);
spin_unlock_irqrestore(&mem->lru_lock, flags);
spin_unlock_irqrestore(&mz->lru_lock, flags);
done:
return 0;
@ -727,6 +731,7 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
void mem_cgroup_uncharge(struct page_cgroup *pc)
{
struct mem_cgroup *mem;
struct mem_cgroup_per_zone *mz;
struct page *page;
unsigned long flags;
@ -739,6 +744,7 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
if (atomic_dec_and_test(&pc->ref_cnt)) {
page = pc->page;
mz = page_cgroup_zoneinfo(pc);
/*
* get page->cgroup and clear it under lock.
* force_empty can drop page->cgroup without checking refcnt.
@ -747,9 +753,9 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
mem = pc->mem_cgroup;
css_put(&mem->css);
res_counter_uncharge(&mem->res, PAGE_SIZE);
spin_lock_irqsave(&mem->lru_lock, flags);
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_remove_list(pc);
spin_unlock_irqrestore(&mem->lru_lock, flags);
spin_unlock_irqrestore(&mz->lru_lock, flags);
kfree(pc);
}
}
@ -788,24 +794,29 @@ void mem_cgroup_page_migration(struct page *page, struct page *newpage)
struct page_cgroup *pc;
struct mem_cgroup *mem;
unsigned long flags;
struct mem_cgroup_per_zone *mz;
retry:
pc = page_get_page_cgroup(page);
if (!pc)
return;
mem = pc->mem_cgroup;
mz = page_cgroup_zoneinfo(pc);
if (clear_page_cgroup(page, pc) != pc)
goto retry;
spin_lock_irqsave(&mem->lru_lock, flags);
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_remove_list(pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);
pc->page = newpage;
lock_page_cgroup(newpage);
page_assign_page_cgroup(newpage, pc);
unlock_page_cgroup(newpage);
__mem_cgroup_add_list(pc);
spin_unlock_irqrestore(&mem->lru_lock, flags);
mz = page_cgroup_zoneinfo(pc);
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_add_list(pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);
return;
}
@ -816,18 +827,26 @@ retry:
*/
#define FORCE_UNCHARGE_BATCH (128)
static void
mem_cgroup_force_empty_list(struct mem_cgroup *mem, struct list_head *list)
mem_cgroup_force_empty_list(struct mem_cgroup *mem,
struct mem_cgroup_per_zone *mz,
int active)
{
struct page_cgroup *pc;
struct page *page;
int count;
unsigned long flags;
struct list_head *list;
if (active)
list = &mz->active_list;
else
list = &mz->inactive_list;
if (list_empty(list))
return;
retry:
count = FORCE_UNCHARGE_BATCH;
spin_lock_irqsave(&mem->lru_lock, flags);
spin_lock_irqsave(&mz->lru_lock, flags);
while (--count && !list_empty(list)) {
pc = list_entry(list->prev, struct page_cgroup, lru);
@ -842,7 +861,7 @@ retry:
} else /* being uncharged ? ...do relax */
break;
}
spin_unlock_irqrestore(&mem->lru_lock, flags);
spin_unlock_irqrestore(&mz->lru_lock, flags);
if (!list_empty(list)) {
cond_resched();
goto retry;
@ -873,11 +892,9 @@ int mem_cgroup_force_empty(struct mem_cgroup *mem)
struct mem_cgroup_per_zone *mz;
mz = mem_cgroup_zoneinfo(mem, node, zid);
/* drop all page_cgroup in active_list */
mem_cgroup_force_empty_list(mem,
&mz->active_list);
mem_cgroup_force_empty_list(mem, mz, 1);
/* drop all page_cgroup in inactive_list */
mem_cgroup_force_empty_list(mem,
&mz->inactive_list);
mem_cgroup_force_empty_list(mem, mz, 0);
}
}
ret = 0;
@ -1114,6 +1131,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
mz = &pn->zoneinfo[zone];
INIT_LIST_HEAD(&mz->active_list);
INIT_LIST_HEAD(&mz->inactive_list);
spin_lock_init(&mz->lru_lock);
}
return 0;
}
@ -1143,7 +1161,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
res_counter_init(&mem->res);
spin_lock_init(&mem->lru_lock);
mem->control_type = MEM_CGROUP_TYPE_ALL;
memset(&mem->info, 0, sizeof(mem->info));