linux-kernel - [PATCH RFC] memcg: notify about global mem_cgroup

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Message-ID: <c53e1df0-5174-66de-23cc-18797f0b512d@openvz.org>
Date:   Sat, 25 Jun 2022 17:04:27 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Shakeel Butt <shakeelb@...gle.com>,
        Michal Koutný <mkoutny@...e.com>,
        Michal Hocko <mhocko@...e.com>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Vlastimil Babka <vbabka@...e.cz>,
        Muchun Song <songmuchun@...edance.com>, cgroups@...r.kernel.org
Subject: [PATCH RFC] memcg: notify about global mem_cgroup_id space depletion

Currently host owner is not informed about the exhaustion of the
global mem_cgroup_id space. When this happens, systemd cannot
start a new service, but nothing points to the real cause of
this failure.

Signed-off-by: Vasily Averin <vvs@...nvz.org>
---
 mm/memcontrol.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d4c606a06bcd..5229321636f2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5317,6 +5317,7 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
 				 1, MEM_CGROUP_ID_MAX + 1, GFP_KERNEL);
 	if (memcg->id.id < 0) {
 		error = memcg->id.id;
+		pr_notice_ratelimited("mem_cgroup_id space is exhausted\n");
 		goto fail;
 	}
 
-- 
2.36.1