Re: [PATCH mm v2 9/9] memcg: enable accounting for percpu allocation of struct rt_rq

Roman Gushchin
2022-05-25T01:31:44Z

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-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>

Acked-by: Roman Gushchin <roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org>