linux-kernel - Re: [RFC 1/2] perf core: Add PERF_COUNT_SW_CGROUP

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Message-ID: <20201203122040.GO3021@hirez.programming.kicks-ass.net>
Date:   Thu, 3 Dec 2020 13:20:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [RFC 1/2] perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event

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?