Re: [PATCH v8 4/5] selftests/ftrace: Add selftest for testing eprobe events

From: Steven Rostedt
Date: Fri Aug 20 2021 - 10:09:10 EST

On Fri, 20 Aug 2021 09:46:39 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:

> > +
> > +echo "$SYNTH u64 filename; s64 ret;" > synthetic_events
> > +echo "hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
> > +echo "hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
> Hmm, can you make this more simple one without synthetic events?
> Since synthetic event depends on CONFIG_SYNTH_EVENTS, you need to add
> "synth_events" to 'requires' tag.
> However, this means that this testcase doesn't run when CONFIG_SYNTH_EVENTS=n

Sure. I just used this because it was one of the main purposes I was
using it for. I may keep this as a test, but will rename it as
something else, and make a more simple one for just testing the event
probe add and removal.

-- Steve