Re: [PATCH] cgroup: Fix rootcg cpu.stat guest double counting

[Andrey Ryabinin]

On 10/29/21 8:21 PM, Daniel Jordan wrote:
> On Thu, Oct 28, 2021 at 03:15:27PM -0700, Dan Schatzberg wrote:
>> In account_guest_time in kernel/sched/cputime.c guest time is
>> attributed to both CPUTIME_NICE and CPUTIME_USER in addition to
>> CPUTIME_GUEST_NICE and CPUTIME_GUEST respectively. Therefore, adding
>> both to calculate usage results in double counting any guest time at
>> the rootcg.
> 
> Yes, definitely a bug.  The same fix was posted a couple months ago as
> part of a series but never picked up:
> 
>   https://x-lore.kernel.org/all/20210820094005.20596-3-arbn@xxxxxxxxxxxxxxx/
> 
> The series also touched cputime, so we might be waiting for scheduler
> folks?   +Ingo +Peter +Andrey
> 

Yeah, I'll do rebase and send v3