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mm: vmscan: pass root_mem_cgroup instead of NULL to memcg aware shrinker

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It's just convenient to implement a memcg aware shrinker when you know
that shrink_control->memcg != NULL unless memcg_kmem_enabled() returns
false.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2016-03-17 14:18:30 -07:00 committed by Linus Torvalds
parent b313aeee25
commit 0fc9f58a90
1 changed files with 10 additions and 5 deletions
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15
mm/vmscan.c
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@ -382,9 +382,8 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
*
* @memcg specifies the memory cgroup to target. If it is not NULL,
* only shrinkers with SHRINKER_MEMCG_AWARE set will be called to scan
* objects from the memory cgroup specified. Otherwise all shrinkers
* are called, and memcg aware shrinkers are supposed to scan the
* global list then.
* objects from the memory cgroup specified. Otherwise, only unaware
* shrinkers are called.
*
* @nr_scanned and @nr_eligible form a ratio that indicate how much of
* the available objects should be scanned. Page reclaim for example
@ -404,7 +403,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
struct shrinker *shrinker;
unsigned long freed = 0;
if (memcg && !memcg_kmem_online(memcg))
if (memcg && (!memcg_kmem_enabled() || !mem_cgroup_online(memcg)))
return 0;
if (nr_scanned == 0)
@ -428,7 +427,13 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
.memcg = memcg,
};
if (memcg && !(shrinker->flags & SHRINKER_MEMCG_AWARE))
/*
* If kernel memory accounting is disabled, we ignore
* SHRINKER_MEMCG_AWARE flag and call all shrinkers
* passing NULL for memcg.
*/
if (memcg_kmem_enabled() &&
!!memcg != !!(shrinker->flags & SHRINKER_MEMCG_AWARE))
continue;
if (!(shrinker->flags & SHRINKER_NUMA_AWARE))