linux-kernel - Re: [PATCH mm v2 8/9] memcg: enable accounting for allocations in alloc_fair_sched

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Message-ID: <CAMZfGtUg65D2KemysdhcQM3-gnz+c_tahzJ=WzBUcY451WBv4Q@mail.gmail.com>
Date:   Sun, 22 May 2022 14:49:36 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, kernel@...nvz.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Koutný <mkoutny@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH mm v2 8/9] memcg: enable accounting for allocations in alloc_fair_sched_group

On Sun, May 22, 2022 at 12:39 AM Vasily Averin <vvs@...nvz.org> wrote:
>
> Creating of each new cpu cgroup allocates two 512-bytes kernel objects
> per CPU. This is especially important for cgroups shared parent memory
> cgroup. In this scenario, on nodes with multiple processors, these
> allocations become one of the main memory consumers.
>
> Memory allocated during new cpu cgroup creation:
> common part:    ~11Kb   +  318 bytes percpu
> cpu cgroup:     ~2.5Kb  + 1036 bytes percpu
>
> Accounting for this memory helps to avoid misuse inside memcg-limited
> contianers.
>
> Signed-off-by: Vasily Averin <vvs@...nvz.org>

Reviewed-by: Muchun Song <songmuchun@...edance.com>