Re: [PATCH mm v3 9/9] memcg: enable accounting for perpu allocation of struct rt_rq

[Muchun Song]

On Mon, May 30, 2022 at 7:27 PM Vasily Averin <vvs@xxxxxxxxxx> 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@xxxxxxxxxx>

Acked-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>

Thanks.