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| author | Tom Zanussi <zanussi@kernel.org> | 2020-10-04 17:14:07 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-08 15:28:14 -0400 |
| commit | 1bc36bd4a8557285870b34cfec7910871049e93e (patch) | |
| tree | abba73a4c8fe0840575cee94b567c0f0ab115255 /kernel/trace/trace.c | |
| parent | bd82631d7ccdc894af2738e47abcba2cb6e7dea9 (diff) | |
| download | lwn-1bc36bd4a8557285870b34cfec7910871049e93e.tar.gz lwn-1bc36bd4a8557285870b34cfec7910871049e93e.zip | |
tracing: Add README information for synthetic_events file
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>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 3f2533adae72..73fd0e0c0f39 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -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 ; |