linux-kernel - Re: [PATCH 8/9] perf top: Add --all-cgroups option

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Message-ID: <20200109081852.GB52936@krava>
Date:   Thu, 9 Jan 2020 09:18:52 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 8/9] perf top: Add --all-cgroups option

On Thu, Jan 09, 2020 at 04:55:21PM +0900, Namhyung Kim wrote:
> On Thu, Jan 9, 2020 at 7:25 AM Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Tue, Jan 07, 2020 at 10:35:00PM +0900, Namhyung Kim wrote:
> > > The --all-cgroups option is to enable cgroup profiling support.  It
> > > tells kernel to record CGROUP events in the ring buffer so that perf
> > > report can identify task/cgroup association later.
> > >
> > > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > > ---
> > >  tools/perf/Documentation/perf-top.txt | 4 ++++
> > >  tools/perf/builtin-top.c              | 9 +++++++++
> > >  2 files changed, 13 insertions(+)
> > >
> > > diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
> > > index 5596129a71cf..c75507f50071 100644
> > > --- a/tools/perf/Documentation/perf-top.txt
> > > +++ b/tools/perf/Documentation/perf-top.txt
> > > @@ -266,6 +266,10 @@ Default is to monitor all CPUS.
> > >       Record events of type PERF_RECORD_NAMESPACES and display it with the
> > >       'cgroup_id' sort key.
> > >
> > > +--cgroup::
> > > +     Record events of type PERF_RECORD_CGROUP and display it with the
> > > +     'cgroup' sort key.
> >
> > should be '--all-cgroups' ?
> 
> Oops, you're right.
> 
> >
> > anyway, we dont have '--cgroups', why not use just this?
> 
> I chose it for consistency since perf record has '--cgroup' option.

I see.. and we have that substring recognition so I suppose --cgroups
would screw the existing --cgroup option, ok

jirka