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authorRoman Gushchin <guro@fb.com>2018-06-08 03:06:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-08 03:34:35 +0300
commit5f93ad67436b3da8312db5ad4eedfa739c00787f (patch)
tree6499c9b2ddd1bb2ef589837e58e14c97aec0bea6 /mm/memcontrol.c
parent230671533d64631116be3ff9d407bd9ca5a58e1b (diff)
downloadlinux-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/memcontrol.c')
-rw-r--r--mm/memcontrol.c6
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;
}
/**