Messages in this thread | | | From | Namhyung Kim <> | Date | Tue, 24 Dec 2019 09:40:04 +0900 | Subject | Re: [PATCHSET 0/9] perf: Improve cgroup profiling (v3) |
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Hi Vince,
On Tue, Dec 24, 2019 at 2:35 AM Vince Weaver <vincent.weaver@maine.edu> 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.
Thanks Namhyung
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