linux-kernel - Re: [PATCHSET 0/9] perf: Improve cgroup profiling (v6)

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Message-ID: <CAM9d7cj1RG0Do9TDSGpRScK+O0bYZ=EEwCdibScBkTbz=4f4Tw@mail.gmail.com>
Date:   Wed, 25 Mar 2020 22:19:57 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCHSET 0/9] perf: Improve cgroup profiling (v6)

Hi Arnaldo,

On Wed, Mar 25, 2020 at 10:05 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Wed, Mar 25, 2020 at 09:45:27PM +0900, Namhyung Kim escreveu:
> > Hello,
> >
> > This work is to improve cgroup profiling in perf.  Currently it only
> > supports profiling tasks in a specific cgroup and there's no way to
> > identify which cgroup the current sample belongs to.  So I added
> > PERF_SAMPLE_CGROUP to add cgroup id into each sample.  It's a 64-bit
> > integer having file handle of the cgroup.  And kernel also generates
> > PERF_RECORD_CGROUP event for new groups to correlate the cgroup id and
> > cgroup name (path in the cgroup filesystem).  The cgroup id can be
> > read from userspace by name_to_handle_at() system call so it can
> > synthesize the CGROUP event for existing groups.
>
> Thanks for the refresh, I'll test this today and all going well push to
> Ingo soon,

Thanks for doing this!
Namhyung