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memcg: fix thresholds with use_hierarchy == 1

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We need to check parent's thresholds if parent has use_hierarchy == 1 to
be sure that parent's threshold events will be triggered even if parent
itself is not active (no MEM_CGROUP_EVENTS).

Signed-off-by: Kirill A. Shutemov <[email protected]>
Reviewed-by: Daisuke Nishimura <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Balbir Singh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2010-10-07 12:59:27 -07:00 • committed by Linus Torvalds
commit ad4ca5f4b7
1 changed files with 7 additions and 3 deletions
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10
mm/memcontrol.c
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@ -3587,9 +3587,13 @@ unlock:
static void mem_cgroup_threshold(struct mem_cgroup *memcg)
{
__mem_cgroup_threshold(memcg, false);
if (do_swap_account)
__mem_cgroup_threshold(memcg, true);
while (memcg) {
__mem_cgroup_threshold(memcg, false);
if (do_swap_account)
__mem_cgroup_threshold(memcg, true);
memcg = parent_mem_cgroup(memcg);
}
}
static int compare_thresholds(const void *a, const void *b)