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SubjectRe: [PATCHSET 0/9] perf: Improve cgroup profiling (v3)
Hi Vince,

On Tue, Dec 24, 2019 at 2:35 AM Vince Weaver <> wrote:
> 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()?

Not yet. I'll cook a patch once it's merged to the Linus' tree.


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