linux-kernel - Re: [PATCHSET 0/4] perf lock contention: Add CSV style output support (v2)

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Date:   Sat, 1 Jul 2023 18:02:35 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Song Liu <song@...nel.org>,
        Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCHSET 0/4] perf lock contention: Add CSV style output support (v2)

On Wed, Jun 28, 2023 at 1:01 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hello,
>
> This is v2 of perf lock contention CSV output change.
> I've added --output option and a test case according to Ian's feedback.
>
> Sometimes we want to process the output by external programs.  Let's add
> the -x option to specify the field separator like perf stat.
>
>   $ sudo ./perf lock con -ab -x, sleep 1
>   # output: contended, total wait, max wait, avg wait, type, caller
>   19, 194232, 21415, 10222, spinlock, process_one_work+0x1f0
>   15, 162748, 23843, 10849, rwsem:R, do_user_addr_fault+0x40e
>   4, 86740, 23415, 21685, rwlock:R, ep_poll_callback+0x2d
>   1, 84281, 84281, 84281, mutex, iwl_mvm_async_handlers_wk+0x135
>   8, 67608, 27404, 8451, spinlock, __queue_work+0x174
>   3, 58616, 31125, 19538, rwsem:W, do_mprotect_pkey+0xff
>   3, 52953, 21172, 17651, rwlock:W, do_epoll_wait+0x248
>   2, 30324, 19704, 15162, rwsem:R, do_madvise+0x3ad
>   1, 24619, 24619, 24619, spinlock, rcu_core+0xd4
>
> The first line is a comment that shows the output format.  Each line is
> separated by the given string ("," in this case).  The time is printed
> in nsec without the unit so that it can be parsed easily.
>
> The code is available at 'perf/lock-con-csv-v2' branch in
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>
> Thanks,
> Namhyung
>
>
> Namhyung Kim (4):
>   perf lock: Remove stale comments
>   perf lock contention: Add -x option for CSV style output
>   perf lock contention: Add --output option
>   perf test: Test perf lock contention CSV output

Applied to perf-tools-next, thanks!