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mm: workingset: make shadow node shrinker memcg aware

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Workingset code was recently made memcg aware, but shadow node shrinker
is still global.  As a result, one small cgroup can consume all memory
available for shadow nodes, possibly hurting other cgroups by reclaiming
their shadow nodes, even though reclaim distances stored in its shadow
nodes have no effect.  To avoid this, we need to make shadow node
shrinker memcg aware.

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 14:18:42 -07:00
committed by Linus Torvalds
parent cdcbb72ebf
commit 0a6b76dd23
3 changed files with 19 additions and 6 deletions
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mm/workingset.c
+7 -3
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@@ -349,8 +349,12 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc);
local_irq_enable();
pages = node_page_state(sc->nid, NR_ACTIVE_FILE) +
node_page_state(sc->nid, NR_INACTIVE_FILE);
if (memcg_kmem_enabled())
pages = mem_cgroup_node_nr_lru_pages(sc->memcg, sc->nid,
LRU_ALL_FILE);
else
pages = node_page_state(sc->nid, NR_ACTIVE_FILE) +
node_page_state(sc->nid, NR_INACTIVE_FILE);
/*
* Active cache pages are limited to 50% of memory, and shadow
@@ -460,7 +464,7 @@ static struct shrinker workingset_shadow_shrinker = {
.count_objects = count_shadow_nodes,
.scan_objects = scan_shadow_nodes,
.seeks = DEFAULT_SEEKS,
.flags = SHRINKER_NUMA_AWARE,
.flags = SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE,
};
/*