1ab55323c5
Like perf lock report, it can report lock contention stat of each task.
$ perf lock contention -t
contended total wait max wait avg wait pid comm
5 945.20 us 902.08 us 189.04 us 316167 EventManager_De
33 98.17 us 6.78 us 2.97 us 766063 kworker/0:1-get
7 92.47 us 61.26 us 13.21 us 316170 EventManager_De
14 76.31 us 12.87 us 5.45 us 12949 timedcall
24 76.15 us 12.27 us 3.17 us 767992 sched-pipe
15 75.62 us 11.93 us 5.04 us 15127 switchto-defaul
24 71.84 us 5.59 us 2.99 us 629168 kworker/u513:2-
17 67.41 us 7.94 us 3.96 us 13504 coroner-
1 59.56 us 59.56 us 59.56 us 316165 EventManager_De
14 56.21 us 6.89 us 4.01 us 0 swapper
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220725183124.368304-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.