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

Andi Kleen
2020-12-02T19:30:28Z

> + 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.

Probably would make sense to have two events for both, one for
all cgroups and one for perf only.

-Andi