linux-kernel - Re: [PATCH mm v2 9/9] memcg: enable accounting for percpu allocation of struct rt

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Date:   Tue, 24 May 2022 18:31:44 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, kernel@...nvz.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Koutný <mkoutny@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH mm v2 9/9] memcg: enable accounting for percpu allocation
 of struct rt_rq

On Sat, May 21, 2022 at 07:39:03PM +0300, Vasily Averin 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
> contianers.
> 
> Signed-off-by: Vasily Averin <vvs@...nvz.org>

Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>