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tracing: Add README information for synthetic_events file

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Add an entry with a basic description of events/synthetic_events along
with a simple example.

Link: https://lkml.kernel.org/r/3c7f178cf95aaeebc01eda7d95600dd937233eb7.1601848695.git.zanussi@kernel.org

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2020-10-04 17:14:07 -05:00 committed by Steven Rostedt (VMware)
parent bd82631d7c
commit 1bc36bd4a8
1 changed files with 6 additions and 1 deletions
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7
kernel/trace/trace.c
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@ -5249,7 +5249,12 @@ static const char readme_msg[] =
"\t trace(<synthetic_event>,param list) - generate synthetic event\n"
"\t save(field,...) - save current event fields\n"
#ifdef CONFIG_TRACER_SNAPSHOT
"\t snapshot() - snapshot the trace buffer\n"
"\t snapshot() - snapshot the trace buffer\n\n"
#endif
#ifdef CONFIG_SYNTH_EVENTS
" events/synthetic_events\t- Create/append/remove/show synthetic events\n"
"\t Write into this file to define/undefine new synthetic events.\n"
"\t example: echo 'myevent u64 lat; char name[]' >> synthetic_events\n"
#endif
#endif
;