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

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Date:   Wed, 28 Aug 2019 10:13:17 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        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

Em Wed, Aug 28, 2019 at 11:44:59AM +0200, Peter Zijlstra escreveu:
> On Wed, Aug 28, 2019 at 04:31:22PM +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.
> > 
> > As aux_output change is also going on, I just added the bit here as
> > well to remove possible conflicts later.
> 
> Why do we want this?

Yeah, I'd resolve the conflict later, to avoid mixing things like this.

- Arnaldo