linux-kernel - Re: [PATCHSET 0/9] perf: Improve cgroup profiling (v3)

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Message-ID: <alpine.DEB.2.21.1912231235090.775@macbook-air>
Date:   Mon, 23 Dec 2019 12:35:47 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
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>,
        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@...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: [PATCHSET 0/9] perf: Improve cgroup profiling (v3)

On Mon, 23 Dec 2019, Namhyung Kim wrote:

> 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.

so is there a patch to the manpage that describes this new behavior in 
perf_event_open()?

Vince