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| author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2022-03-02 20:01:36 +0100 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-03-15 14:36:50 -0400 |
| commit | 761916fd02c2525139aca957b8a53fda1d8b3616 (patch) | |
| tree | 8d73146997cccbe6cd77727c96ae33cbfbc7b639 /Documentation | |
| parent | 44f3a37d1d3eb10770c7fec4eb89495d37957a26 (diff) | |
| download | lwn-761916fd02c2525139aca957b8a53fda1d8b3616.tar.gz lwn-761916fd02c2525139aca957b8a53fda1d8b3616.zip | |
rtla/trace: Save event histogram output to a file
The hist: trigger generates a histogram in the file sys/event/hist.
If the hist: trigger is used, automatically save the histogram output of
the event sys:event in the sys_event_hist.txt file.
Link: https://lkml.kernel.org/r/b5c906af31d4e022ffe87fb0848fac5c089087c8.1646247211.git.bristot@kernel.org
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/tools/rtla/common_options.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/tools/rtla/common_options.rst b/Documentation/tools/rtla/common_options.rst index afd45bae821f..af76df6205d4 100644 --- a/Documentation/tools/rtla/common_options.rst +++ b/Documentation/tools/rtla/common_options.rst @@ -23,7 +23,15 @@ Filter the previous **-e** *sys:event* event with *<filter>*. For further information about event filtering see https://www.kernel.org/doc/html/latest/trace/events.html#event-filtering. **--trigger** *<trigger>* - Enable a trace event trigger to the previous **-e** *sys:event*. For further information about event trigger see https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers. + Enable a trace event trigger to the previous **-e** *sys:event*. + If the *hist:* trigger is activated, the output histogram will be automatically saved to a file named *system_event_hist.txt*. + For example, the command: + + rtla <command> <mode> -t -e osnoise:irq_noise --trigger="hist:key=desc,duration/1000:sort=desc,duration/1000:vals=hitcount" + + Will automatically save the content of the histogram associated to *osnoise:irq_noise* event in *osnoise_irq_noise_hist.txt*. + + For further information about event trigger see https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers. **-P**, **--priority** *o:prio|r:prio|f:prio|d:runtime:period* |