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selftests/ftrace: Add clear_dynamic_events() to test cases

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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/20210819152825.348941368@goodmis.org

Cc: "Tzvetomir Stoyanov" <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-kselftest@vger.kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-08-19 11:26:07 -04:00
parent 7491e2c442
commit aaac2820a3
1 changed files with 22 additions and 0 deletions
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22
tools/testing/selftests/ftrace/test.d/functions
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@ -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