linux-kernel - Re: [PATCH 3/4] memcg: enable accounting for struct cgroup

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Message-ID: <20220519165325.GA2434@blackbody.suse.cz>
Date:   Thu, 19 May 2022 18:53:25 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>, kernel@...nvz.org,
        linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH 3/4] memcg: enable accounting for struct cgroup

On Fri, May 13, 2022 at 06:52:12PM +0300, Vasily Averin <vvs@...nvz.org> wrote:
> Creating each new cgroup allocates 4Kb for struct cgroup. This is the
> largest memory allocation in this scenario and is epecially important
> for small VMs with 1-2 CPUs.

What do you mean by this argument?

(On bigger irons, the percpu components becomes dominant, e.g. struct
cgroup_rstat_cpu.)

Thanks,
Michal