From: Namhyung Kim <namhyung@kernel.org>
To: Song Liu <liu.song.a23@gmail.com>
Cc: Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Jiri Olsa <jolsa@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Stephane Eranian <eranian@google.com>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature
Date: Fri, 20 Sep 2019 17:47:45 +0900 [thread overview]
Message-ID: <CAM9d7cg_AKCyifV7xDm7sJ4=wgG_K=qu013TSTHqLiCRh9m_pg@mail.gmail.com> (raw)
In-Reply-To: <CAPhsuW54+YNkj3fnmS6P0=eEdzZ4YvV7Yv+t-d-OnRNNgxPS+Q@mail.gmail.com>
Hello Song,
On Thu, Sep 19, 2019 at 3:43 PM Song Liu <liu.song.a23@gmail.com> wrote:
> Sharing some offline discussions with Tejun.
>
> ino in current kernfs is not a good unique ID for cgroup, because it doesn't
> increase monotonically. So we need to improve kernfs.
>
> For 64-bit, we can make the ino monotonic, and use it as the ID.
> For 32-bit, we need to make the ino monotonic. and use <ino> and <gen>
> as the 64-bit ID.
Thanks for the sharing information! For 32-bit, while the ino itself is not
monotonic, gen << 32 + ino is monotonic right? I think we can use the
same logic of kernfs id allocation, but not sure what the problem Tejun
mentioned before is.
Thanks,
Namhyung
next prev parent reply other threads:[~2019-09-20 8:48 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-28 7:31 [PATCHSET 0/9] perf: Improve cgroup profiling (v1) Namhyung Kim
2019-08-28 7:31 ` [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event Namhyung Kim
2019-08-28 9:44 ` Peter Zijlstra
2019-08-28 9:44 ` Peter Zijlstra
2019-08-28 13:13 ` Arnaldo Carvalho de Melo
2019-08-30 3:46 ` Namhyung Kim
2019-08-30 7:34 ` Peter Zijlstra
2019-08-30 22:49 ` Namhyung Kim
2019-08-30 23:52 ` Stephane Eranian
2019-08-28 14:48 ` Tejun Heo
2019-08-30 3:56 ` Namhyung Kim
2019-08-28 7:31 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-08-28 14:49 ` Tejun Heo
2019-08-31 3:03 ` Namhyung Kim
2019-08-31 4:58 ` Tejun Heo
2019-09-03 2:13 ` Namhyung Kim
2019-09-05 16:56 ` Tejun Heo
2019-09-08 13:28 ` Namhyung Kim
2019-09-14 14:02 ` Song Liu
2019-09-16 15:23 ` Tejun Heo
2019-09-19 6:42 ` Song Liu
2019-09-20 8:47 ` Namhyung Kim [this message]
2019-09-20 16:13 ` Song Liu
2019-09-20 21:04 ` Tejun Heo
2019-10-02 6:28 ` Namhyung Kim
2019-10-07 14:16 ` Tejun Heo
2019-08-28 7:31 ` [PATCH 3/9] perf tools: Basic support for CGROUP event Namhyung Kim
2019-08-30 12:55 ` Arnaldo Carvalho de Melo
2019-08-30 22:51 ` Namhyung Kim
2019-08-28 7:31 ` [PATCH 4/9] perf tools: Maintain cgroup hierarchy Namhyung Kim
2019-08-28 7:31 ` [PATCH 5/9] perf report: Add 'cgroup' sort key Namhyung Kim
2019-08-28 7:31 ` [PATCH 6/9] perf record: Support synthesizing cgroup events Namhyung Kim
2019-08-28 7:31 ` [PATCH 7/9] perf record: Add --all-cgroups option Namhyung Kim
2019-08-28 7:31 ` [PATCH 8/9] perf top: " Namhyung Kim
2019-08-28 7:31 ` [PATCH 9/9] perf script: Add --show-cgroup-events option Namhyung Kim
2019-12-20 4:32 [PATCHSET 0/9] perf: Improve cgroup profiling (v2) Namhyung Kim
2019-12-20 4:32 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-12-20 9:36 ` Peter Zijlstra
2019-12-20 15:23 ` Tejun Heo
2019-12-20 16:48 ` Peter Zijlstra
2019-12-20 16:59 ` Tejun Heo
2019-12-23 6:07 [PATCHSET 0/9] perf: Improve cgroup profiling (v3) Namhyung Kim
2019-12-23 6:07 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2020-01-07 13:34 [PATCHSET 0/9] perf: Improve cgroup profiling (v4) Namhyung Kim
2020-01-07 13:34 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2020-03-25 12:45 [PATCHSET 0/9] perf: Improve cgroup profiling (v6) Namhyung Kim
2020-03-25 12:45 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
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