Commit aaac2820 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

selftests/ftrace: Add clear_dynamic_events() to test cases 

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: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 7491e2c4

tools/testing/selftests/ftrace/test.d/functions

+22 −0
Original line number Diff line number Diff line
@@ -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