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mm: memcg: reset oom_group in css_reset

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memory.oom.group defaults to disabled, but css_reset did not clear
memcg->oom_group when a disabled memory css is kept alive by another
controller dependency.

Reset it with the other memory controller policies so a hidden memcg
cannot keep applying stale group OOM kill policy.

Link: https://lore.kernel.org/20260703063826.306878-2-jiayuan.chen@linux.dev
Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jiayuan Chen 2026-07-03 14:38:24 +08:00 committed by Andrew Morton
parent f11ff47ee9
commit 74183a956d
1 changed files with 1 additions and 0 deletions
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mm/memcontrol.c
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@ -4362,6 +4362,7 @@ static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
page_counter_set_max(&memcg->memory, PAGE_COUNTER_MAX);
page_counter_set_max(&memcg->swap, PAGE_COUNTER_MAX);
WRITE_ONCE(memcg->oom_group, false);
#ifdef CONFIG_ZSWAP
WRITE_ONCE(memcg->zswap_max, PAGE_COUNTER_MAX);
WRITE_ONCE(memcg->zswap_writeback, true);