linux-kernel - Re: [PATCHSET v2 0/3] perf stat: Enable BPF counters with --for-each-cgroup

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Message-ID: <YMoVOp4+TIUViBb7@hirez.programming.kicks-ass.net>
Date:   Wed, 16 Jun 2021 17:14:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Song Liu <songliubraving@...com>
Subject: Re: [PATCHSET v2 0/3] perf stat: Enable BPF counters with
 --for-each-cgroup

On Mon, Jun 14, 2021 at 06:17:21PM -0700, Namhyung Kim wrote:
> Current limitations are:
>  * it doesn't support cgroup hierarchy

That seems unfortunate; there's no bpf helper to iterate cgroup
hierarchy?

>  * there's no reliable way to trigger running the BPF program

You can't attach to the PERF_COUNT_SW_CGROUP_SWITCHES event?