linux-kernel - Re: [PATCH 1/9] perf/core: Add PERF_RECORD

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Date:   Fri, 20 Dec 2019 20:28:01 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        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>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event

Hi Peter,

On Fri, Dec 20, 2019 at 6:33 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Fri, Dec 20, 2019 at 01:32:45PM +0900, Namhyung Kim wrote:
> > To support cgroup tracking, add CGROUP event to save a link between
> > cgroup path and inode number.  The attr.cgroup bit was also added to
> > enable cgroup tracking from userspace.
> >
> > This event will be generated when a new cgroup becomes active.
> > Userspace might need to synthesize those events for existing cgroups.
> >
> > Cc: Tejun Heo <tj@...nel.org>
> > Cc: Li Zefan <lizefan@...wei.com>
> > Cc: Johannes Weiner <hannes@...xchg.org>
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>
> TJ, is this the right thing to do? ISTR you had concerns on this topic
> on the past.

Oh, I should've updated the changelog.  Now it uses 64bit cgroup id which
was converted by Tejun.

https://lkml.org/lkml/2019/11/4/1551

Thanks
Namhyung