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authorTom Zanussi <zanussi@kernel.org>2020-10-04 17:14:07 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-10-08 15:28:14 -0400
commit1bc36bd4a8557285870b34cfec7910871049e93e (patch)
treeabba73a4c8fe0840575cee94b567c0f0ab115255 /kernel/trace
parentbd82631d7ccdc894af2738e47abcba2cb6e7dea9 (diff)
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')
-rw-r--r--kernel/trace/trace.c7
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
;