linux-kernel - Re: [PATCHSET 0/6] perf lock: Random updates for the locking analysis (v1)

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Date:   Sun, 9 Jan 2022 14:13:09 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCHSET 0/6] perf lock: Random updates for the locking
 analysis (v1)

On Tue, Jan 04, 2022 at 10:20:48AM -0800, Namhyung Kim wrote:

SNIP

> With -c option, the hrtimer_bases.lock would be combined into a single
> entry.  Also note that the lock names are correctly displayed now.
> 
>   # perf lock report -c
>                   Name   acquired  contended   avg wait (ns) total wait (ns)   max wait (ns)   min wait (ns) 
>   
>          rcu_read_lock     251225          0               0               0               0               0 
>     hrtimer_bases.lock      39449          0               0               0               0               0 
>    &sb->s_type->i_l...      10301          1             662             662             662             662 
>       ptlock_ptr(page)      10173          2             701            1402             760             642 
>    &(ei->i_block_re...       8732          0               0               0               0               0 
>            &base->lock       6705          0               0               0               0               0 
>            &p->pi_lock       5549          0               0               0               0               0 
>    &dentry->d_lockr...       5010          4            1274            5097            1844             789 
>              &ep->lock       2750          0               0               0               0               0 
>    &(__futex_data.q...       2331          0               0               0               0               0 
>                 (null)       1878          0               0               0               0               0 
>       cpu_hotplug_lock       1350          0               0               0               0               0 
>       &____s->seqcount       1349          0               0               0               0               0 
>       &newf->file_lock       1001         15            1025           15388            2279             618 
>   ...
> 
> Maybe we can make it default later (with a config and --no-combine-locks).
> 
> You can get it from 'perf/lock-combine-v1' branch at
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Thanks,
> Namhyung
> 
> 
> Namhyung Kim (6):
>   perf lock: Convert lockhash_table to use hlist
>   perf lock: Change type of lock_stat->addr to u64
>   perf lock: Sort map info based on class name
>   perf lock: Fix lock name length check for printing
>   perf lock: Add -c/--combine-locks option
>   perf lock: Carefully combine lock stats for discarded entries
> 
>  tools/perf/Documentation/perf-lock.txt |   4 +
>  tools/perf/builtin-lock.c              | 155 +++++++++++++++++++------
>  2 files changed, 124 insertions(+), 35 deletions(-)

LGTM

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> 
> 
> base-commit: b9f6fbb3b2c29736970ae9fcc0e82b0bd459442b
> -- 
> 2.34.1.448.ga2b2bfdf31-goog
>