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

[Roman Gushchin]

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@xxxxxxxxxx>

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