On Thu, 19 Aug 2021 11:26:07 -0400 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx> > > Add a function to remove all dynamic events from the tracing directory. It > requires a loop as some of the dynamic events may depend on others being > removed first. Also add a safety that prevents it from looping infinitely > due to a bug where an event never gets removed. > > Link: https://lkml.kernel.org/r/20210819041842.696873153@xxxxxxxxxxx > Thank you for adding this useful function! Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > Cc: Shuah Khan <shuah@xxxxxxxxxx> > Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> > Cc: linux-kselftest@xxxxxxxxxxxxxxx > Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> > --- > .../testing/selftests/ftrace/test.d/functions | 22 +++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions > index a6fac927ee82..f68d336b961b 100644 > --- a/tools/testing/selftests/ftrace/test.d/functions > +++ b/tools/testing/selftests/ftrace/test.d/functions > @@ -83,6 +83,27 @@ clear_synthetic_events() { # reset all current synthetic events > done > } > > +clear_dynamic_events() { # reset all current dynamic events > + again=1 > + stop=1 > + # loop mulitple times as some events require other to be removed first > + while [ $again -eq 1 ]; do > + stop=$((stop+1)) > + # Prevent infinite loops > + if [ $stop -gt 10 ]; then > + break; > + fi > + again=2 > + grep -v '^#' dynamic_events| > + while read line; do > + del=`echo $line | sed -e 's/^.\([^ ]*\).*/-\1/'` > + if ! echo "$del" >> dynamic_events; then > + again=1 > + fi > + done > + done > +} > + > initialize_ftrace() { # Reset ftrace to initial-state > # As the initial state, ftrace will be set to nop tracer, > # no events, no triggers, no filters, no function filters, > @@ -93,6 +114,7 @@ initialize_ftrace() { # Reset ftrace to initial-state > reset_events_filter > reset_ftrace_filter > disable_events > + clear_dynamic_events > [ -f set_event_pid ] && echo > set_event_pid > [ -f set_ftrace_pid ] && echo > set_ftrace_pid > [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace > -- > 2.30.2 -- Masami Hiramatsu <mhiramat@xxxxxxxxxx>
