perf lock: Add contention subcommand (v1)

From:		Namhyung Kim <namhyung-AT-kernel.org>
To:		Arnaldo Carvalho de Melo <acme-AT-kernel.org>, Jiri Olsa <jolsa-AT-kernel.org>
Subject:		[PATCHSET 0/6] perf lock: Add contention subcommand (v1)
Date:		Wed, 20 Jul 2022 21:36:38 -0700
Message-ID:		<20220721043644.153718-1-namhyung@kernel.org>
Cc:		Ingo Molnar <mingo-AT-kernel.org>, Peter Zijlstra <peterz-AT-infradead.org>, LKML <linux-kernel-AT-vger.kernel.org>, Ian Rogers <irogers-AT-google.com>, linux-perf-users-AT-vger.kernel.org, Will Deacon <will-AT-kernel.org>, Waiman Long <longman-AT-redhat.com>, Boqun Feng <boqun.feng-AT-gmail.com>, Davidlohr Bueso <dave-AT-stgolabs.net>
Archive-link:		Article

Hello,

It's to add a new subcommand 'contention' (shortly 'con') to perf lock.

The new subcommand is to handle the new lock:contention_{begin,end}
tracepoints and shows lock type and caller address like below:

  $ perf lock contention
   contended   total wait     max wait     avg wait         type   caller

         238      1.41 ms     29.20 us      5.94 us     spinlock   update_blocked_averages+0x4c
           1    902.08 us    902.08 us    902.08 us      rwsem:R   do_user_addr_fault+0x1dd
          81    330.30 us     17.24 us      4.08 us     spinlock   _nohz_idle_balance+0x172
           2     89.54 us     61.26 us     44.77 us     spinlock   do_anonymous_page+0x16d
          24     78.36 us     12.27 us      3.27 us        mutex   pipe_read+0x56
           2     71.58 us     59.56 us     35.79 us     spinlock   __handle_mm_fault+0x6aa
           6     25.68 us      6.89 us      4.28 us     spinlock   do_idle+0x28d
           1     18.46 us     18.46 us     18.46 us      rtmutex   exec_fw_cmd+0x21b
           3     15.25 us      6.26 us      5.08 us     spinlock   tick_do_update_jiffies64+0x2c
   ...

where rwsem:R stands for read access (down_read) for a rw-semaphore.
Other types of lock access is obvious and it doesn't detect optimistic
spinning on mutex yet.  This is just a base work for lock contention
analysis and more will come later.

You can get this from 'perf/lock-subcmd-v1' branch on

  git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

Thanks,
Namhyung


Namhyung Kim (6):
  perf lock: Fix a copy-n-paste bug
  perf lock: Add flags field in the lock_stat
  perf lock: Add lock aggregation enum
  perf lock: Add 'contention' subcommand
  perf lock: Add -k and -F options to 'contention' subcommand
  perf lock: Support -t option for 'contention' subcommand

 tools/perf/Documentation/perf-lock.txt |  23 +-
 tools/perf/builtin-lock.c              | 403 ++++++++++++++++++++++---
 2 files changed, 391 insertions(+), 35 deletions(-)


base-commit: 41d0914d861e82b4eeec16dd0f6109c311cf4c7e
-- 
2.37.0.170.g444d1eabd0-goog