linux-kernel - Re: [PATCH mm v3 9/9] memcg: enable accounting for perpu allocation of struct rt

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Date:   Mon, 30 May 2022 23:06:09 +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 v3 9/9] memcg: enable accounting for perpu allocation
 of struct rt_rq

On Mon, May 30, 2022 at 7:27 PM Vasily Averin <vvs@...nvz.org> wrote:
>
> If enabled in config, alloc_rt_sched_group() is called for each new
> cpu cgroup and allocates a huge (~1700 bytes) percpu struct rt_rq.
> This significantly exceeds the size of the percpu allocation in the
> common part of cgroup creation.
>
> Memory allocated during new cpu cgroup creation
> (with enabled RT_GROUP_SCHED):
> common part:    ~11Kb   +   318 bytes percpu
> cpu cgroup:     ~2.5Kb  + ~2800 bytes percpu
>
> Accounting for this memory helps to avoid misuse inside memcg-limited
> containers.
>
> Signed-off-by: Vasily Averin <vvs@...nvz.org>

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

Thanks.