Re: [RFC 1/2] perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event

Peter Zijlstra
2020-12-03T12:21:49Z

On Wed, Dec 02, 2020 at 11:28:28AM -0800, Andi Kleen wrote:
> > + prev_cgrp = task_css_check(prev, perf_event_cgrp_id, 1)->cgroup;
> > + next_cgrp = task_css_check(next, perf_event_cgrp_id, 1)->cgroup;
> > +
> > + if (prev_cgrp != next_cgrp)
> > + perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0);
>
> Seems to be the perf cgroup only, not all cgroups.
> That's a big difference and needs to be documented properly.

With cgroup-v2 that's all the same, no?