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mm: workingset: per-cgroup cache thrash detection

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Cache thrash detection (see a528910e12 "mm: thrash detection-based
file cache sizing" for details) currently only works on the system
level, not inside cgroups.  Worse, as the refaults are compared to the
global number of active cache, cgroups might wrongfully get all their
refaults activated when their pages are hotter than those of others.

Move the refault machinery from the zone to the lruvec, and then tag
eviction entries with the memcg ID.  This makes the thrash detection
work correctly inside cgroups.

[sergey.senozhatsky@gmail.com: do not return from workingset_activation() with locked rcu and page]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.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
2016-03-15 14:57:16 -07:00
committed by Linus Torvalds
parent 612e44939c
commit 23047a96d7
5 changed files with 134 additions and 57 deletions
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18
mm/vmscan.c
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@@ -213,7 +213,7 @@ bool zone_reclaimable(struct zone *zone)
zone_reclaimable_pages(zone) * 6;
}
static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru)
unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru)
{
if (!mem_cgroup_disabled())
return mem_cgroup_get_lru_size(lruvec, lru);
@@ -1923,8 +1923,8 @@ static bool inactive_file_is_low(struct lruvec *lruvec)
unsigned long inactive;
unsigned long active;
inactive = get_lru_size(lruvec, LRU_INACTIVE_FILE);
active = get_lru_size(lruvec, LRU_ACTIVE_FILE);
inactive = lruvec_lru_size(lruvec, LRU_INACTIVE_FILE);
active = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE);
return active > inactive;
}
@@ -2063,7 +2063,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* system is under heavy pressure.
*/
if (!inactive_file_is_low(lruvec) &&
get_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) {
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) {
scan_balance = SCAN_FILE;
goto out;
}
@@ -2089,10 +2089,10 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* anon in [0], file in [1]
*/
anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
get_lru_size(lruvec, LRU_INACTIVE_ANON);
file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
get_lru_size(lruvec, LRU_INACTIVE_FILE);
anon = lruvec_lru_size(lruvec, LRU_ACTIVE_ANON) +
lruvec_lru_size(lruvec, LRU_INACTIVE_ANON);
file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE) +
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE);
spin_lock_irq(&zone->lru_lock);
if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
@@ -2130,7 +2130,7 @@ out:
unsigned long size;
unsigned long scan;
size = get_lru_size(lruvec, lru);
size = lruvec_lru_size(lruvec, lru);
scan = size >> sc->priority;
if (!scan && pass && force_scan)