diff options
| author | Chris Down <chris@chrisdown.name> | 2020-04-01 21:07:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-02 09:35:29 -0700 |
| commit | c3d532008661da197997fc6d8098190eef9344ad (patch) | |
| tree | c8ce41c0a1244c279675a4ac01c7f06eb190ee49 /mm/memcontrol.c | |
| parent | f86b810c2610b08afc82218068d1dfeef02dd0a1 (diff) | |
| download | linux-c3d532008661da197997fc6d8098190eef9344ad.tar.bz2 | |
mm, memcg: prevent memory.min load/store tearing
This can be set concurrently with reads, which may cause the wrong value
to be propagated.
Signed-off-by: Chris Down <chris@chrisdown.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/e809b4e6b0c1626dac6945970de06409a180ee65.1584034301.git.chris@chrisdown.name
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f7af5aea0054..dc28afa149ef 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6389,7 +6389,7 @@ enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root, return MEMCG_PROT_NONE; if (parent == root) { - memcg->memory.emin = memcg->memory.min; + memcg->memory.emin = READ_ONCE(memcg->memory.min); memcg->memory.elow = memcg->memory.low; goto out; } @@ -6397,7 +6397,8 @@ enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root, parent_usage = page_counter_read(&parent->memory); memcg->memory.emin = effective_protection(usage, parent_usage, - memcg->memory.min, READ_ONCE(parent->memory.emin), + READ_ONCE(memcg->memory.min), + READ_ONCE(parent->memory.emin), atomic_long_read(&parent->memory.children_min_usage)); memcg->memory.elow = effective_protection(usage, parent_usage, |