tracing: Add README information for synthetic_events file (1bc36bd4) · Commits · 戴 / test

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:

kernel/trace/trace.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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
		;