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| author | Roman Gushchin <guro@fb.com> | 2018-06-08 03:06:26 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-08 03:34:35 +0300 |
| commit | 5f93ad67436b3da8312db5ad4eedfa739c00787f (patch) | |
| tree | 6499c9b2ddd1bb2ef589837e58e14c97aec0bea6 /mm | |
| parent | 230671533d64631116be3ff9d407bd9ca5a58e1b (diff) | |
| download | linux-5f93ad67436b3da8312db5ad4eedfa739c00787f.tar.xz | |
mm: treat memory.low value inclusive
If memcg's usage is equal to the memory.low value, avoid reclaiming from
this cgroup while there is a surplus of reclaimable memory.
This sounds more logical and also matches memory.high and memory.max
behavior: both are inclusive.
Empty cgroups are not considered protected, so MEMCG_LOW events are not
emitted for empty cgroups, if there is no more reclaimable memory in the
system.
Link: http://lkml.kernel.org/r/20180406122132.GA7185@castle
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d0261059aab9..8bab4660e6aa 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5344,14 +5344,14 @@ struct cgroup_subsys memory_cgrp_subsys = { }; /** - * mem_cgroup_low - check if memory consumption is below the normal range + * mem_cgroup_low - check if memory consumption is in the normal range * @root: the top ancestor of the sub-tree being checked * @memcg: the memory cgroup to check * * WARNING: This function is not stateless! It can only be used as part * of a top-down tree iteration, not for isolated queries. * - * Returns %true if memory consumption of @memcg is below the normal range. + * Returns %true if memory consumption of @memcg is in the normal range. * * @root is exclusive; it is never low when looked at directly * @@ -5445,7 +5445,7 @@ bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg) elow = min(elow, parent_elow * low_usage / siblings_low_usage); exit: memcg->memory.elow = elow; - return usage < elow; + return usage && usage <= elow; } /** |