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authorDaniel Bristot de Oliveira <bristot@kernel.org>2022-03-02 20:01:36 +0100
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-03-15 19:36:50 +0100
commit761916fd02c2525139aca957b8a53fda1d8b3616 (patch)
tree8d73146997cccbe6cd77727c96ae33cbfbc7b639 /Documentation/tools/rtla
parentrtla: Add --filter support (diff)
downloadlinux-761916fd02c2525139aca957b8a53fda1d8b3616.tar.xz
linux-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/tools/rtla')
-rw-r--r--Documentation/tools/rtla/common_options.rst10
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*