linux-kernel - Re: [PATCH 0/4] perf lock contention: Support task/addr aggregation mode (v1)

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Message-ID: <Y5eH1o/NXz4oxTpQ@kernel.org>
Date:   Mon, 12 Dec 2022 16:58:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Song Liu <song@...nel.org>,
        Blake Jones <blakejones@...gle.com>, bpf@...r.kernel.org
Subject: Re: [PATCH 0/4] perf lock contention: Support task/addr aggregation
 mode (v1)

Em Fri, Dec 09, 2022 at 11:07:23AM -0800, Namhyung Kim escreveu:
> Hello,
> 
> This patchset adds two more aggregation modes for perf lock contention.


Thanks, applied.

- Arnaldo

 
> The first one is the per-task mode with -t/--threads option.  The option
> was there already but it remained broken with BPF for a while.  Now it
> supports the output with and without BPF.
> 
>   # perf lock contention -a -b -t -- sleep 1
>    contended   total wait     max wait     avg wait          pid   comm
> 
>           11     11.85 us      2.23 us      1.08 us            0   swapper
>            2     11.13 us     10.22 us      5.56 us       749053   ThreadPoolForeg
>            1      8.15 us      8.15 us      8.15 us       321353   Chrome_ChildIOT
>            2      2.73 us      1.77 us      1.37 us       320761   Chrome_ChildIOT
>            1      1.40 us      1.40 us      1.40 us       320502   chrome
>            1       379 ns       379 ns       379 ns       321227   chrome
> 
> The other one is the per-lock-instance mode with -l/--lock-addr option.
> If the lock has a symbol, it will be displayed as well.
> 
>   # perf lock contention -a -b -l -- sleep 1
>    contended   total wait     max wait     avg wait            address   symbol
> 
>            3      4.79 us      2.33 us      1.60 us   ffffffffbaed50c0   rcu_state
>            4      4.19 us      1.62 us      1.05 us   ffffffffbae07a40   jiffies_lock
>            1      1.94 us      1.94 us      1.94 us   ffff9262277861e0
>            1       387 ns       387 ns       387 ns   ffff9260bfda4f60
> 
> It's based on the current acme/tmp.perf/core branch.
> You can find the code in the 'perf/lock-con-aggr-v1' branch in
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Thanks,
> Namhyung
> 
> 
> Namhyung Kim (4):
>   perf lock contention: Add lock_data.h for common data
>   perf lock contention: Implement -t/--threads option for BPF
>   perf lock contention: Add -l/--lock-addr option
>   perf test: Update perf lock contention test
> 
>  tools/perf/Documentation/perf-lock.txt        |  4 +
>  tools/perf/builtin-lock.c                     | 95 ++++++++++++++-----
>  tools/perf/tests/shell/lock_contention.sh     | 48 ++++++++++
>  tools/perf/util/bpf_lock_contention.c         | 72 ++++++++++----
>  .../perf/util/bpf_skel/lock_contention.bpf.c  | 67 +++++++++----
>  tools/perf/util/bpf_skel/lock_data.h          | 30 ++++++
>  tools/perf/util/lock-contention.h             |  1 +
>  7 files changed, 255 insertions(+), 62 deletions(-)
>  create mode 100644 tools/perf/util/bpf_skel/lock_data.h
> 
> 
> base-commit: b22802e295a80ec16e355d7208d2fbbd7bbc1b7a
> -- 
> 2.39.0.rc1.256.g54fd8350bd-goog

-- 

- Arnaldo