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From:   Vince Weaver <vincent.weaver@maine.edu>
Date:   Mon, 23 Dec 2019 12:35:47 -0500 (EST)
To:     Namhyung Kim <namhyung@kernel.org>
cc:     Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@redhat.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Stephane Eranian <eranian@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-perf-users@vger.kernel.org, Tejun Heo <tj@kernel.org>,
        Li Zefan <lizefan@huawei.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Adrian Hunter <adrian.hunter@intel.com>
Subject: Re: [PATCHSET 0/9] perf: Improve cgroup profiling (v3)
In-Reply-To: <20191223060759.841176-1-namhyung@kernel.org>
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References: <20191223060759.841176-1-namhyung@kernel.org>
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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