diff options
| author | Vladimir Davydov <vdavydov@virtuozzo.com> | 2016-03-17 14:18:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | 0fc9f58a90a5012942abf0ae98cfc852afebc0a6 (patch) | |
| tree | 3b51544a861e0fc6f9e6398937552aff1e55a072 /mm/vmscan.c | |
| parent | b313aeee25098bf361c808fe45ba2d3af398ec46 (diff) | |
mm: vmscan: pass root_mem_cgroup instead of NULL to memcg aware shrinker
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>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index f87cfaa955a8..b41b82d4bab1 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -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)) |