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memcg: bail out memory.max when memcg is dying

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memory.max has the same high-latency reclaim loop as memory.high, and may
additionally invoke the OOM killer on a cgroup that is already going away,
further delaying its removal.

Mitigate this by bailing out of the loop once memcg_is_dying().

Link: https://lore.kernel.org/20260702120235.376752-3-jiayuan.chen@linux.dev
Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com>
Reported-by: Zhou Yingfu <yingfu.zhou@shopee.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jiayuan Chen 2026-07-02 20:02:28 +08:00 committed by Andrew Morton
parent 0beeaf14e7
commit e13f634f50
1 changed files with 4 additions and 0 deletions
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4
mm/memcontrol.c
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@ -4854,6 +4854,10 @@ static ssize_t memory_max_write(struct kernfs_open_file *of,
if (signal_pending(current))
break;
/* cgroup_rmdir() waits for us with cgroup_mutex held. */
if (memcg_is_dying(memcg))
break;
if (!drained) {
drain_all_stock(memcg);
drained = true;