The patch titled
Subject: memcg: notify about global mem_cgroup_id space depletion
has been added to the -mm mm-unstable branch. Its filename is
memcg-notify-about-global-mem_cgroup_id-space-depletion.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/memcg-notify-about-global-mem_cgroup_id-space-depletion.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Vasily Averin <vvs@xxxxxxxxxx>
Subject: memcg: notify about global mem_cgroup_id space depletion
Date: Mon, 27 Jun 2022 05:11:26 +0300
Currently, the host owner is not informed about the exhaustion of the
global mem_cgroup_id space. When this happens, systemd cannot start a new
service and receives a unique -ENOSPC error code. However, this can
happen inside this container, persist in the log file of the local
container, and may not be noticed by the host owner if he did not try to
start any new services.
Link: https://lkml.kernel.org/r/97bed1fd-f230-c2ea-1cb6-8230825a9a64@xxxxxxxxxx
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Michal Koutný <mkoutny@xxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/memcontrol.c~memcg-notify-about-global-mem_cgroup_id-space-depletion
+++ a/mm/memcontrol.c
@@ -5286,6 +5286,8 @@ static struct mem_cgroup *mem_cgroup_all
1, MEM_CGROUP_ID_MAX + 1, GFP_KERNEL);
if (memcg->id.id < 0) {
error = memcg->id.id;
+ if (error == -ENOSPC)
+ pr_notice_ratelimited("mem_cgroup_id space is exhausted\n");
goto fail;
}
_
Patches currently in -mm which might be from vvs@xxxxxxxxxx are
memcg-notify-about-global-mem_cgroup_id-space-depletion.patch
