linux-kernel - Re: [PATCH mm v2] memcg: notify about global mem_cgroup

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Message-ID: <f3e4059c-69ea-eccd-a22f-9f6c6780f33a@openvz.org>
Date:   Mon, 27 Jun 2022 09:49:18 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Koutný <mkoutny@...e.com>,
        Michal Hocko <mhocko@...e.com>, kernel@...nvz.org,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH mm v2] memcg: notify about global mem_cgroup_id space
 depletion

On 6/27/22 06:23, Muchun Song wrote:
> If the caller can know -ENOSPC is returned by mkdir(), then I
> think the user (perhaps systemd) is the best place to throw out the
> error message instead of in the kernel log. Right?

Such an incident may occur inside the container.
OpenVZ nodes can host 300-400 containers, and the host admin cannot
monitor guest logs. the dmesg message is necessary to inform the host
owner that the global limit has been reached, otherwise he can
continue to believe that there are no problems on the node.

Thank you,
	Vasily Averin