1 2 clear_trace() { # reset trace output 3 echo > trace 4 } 5 6 disable_tracing() { # stop trace recording 7 echo 0 > tracing_on 8 } 9 10 enable_tracing() { # start trace recording 11 echo 1 > tracing_on 12 } 13 14 reset_tracer() { # reset the current tracer 15 echo nop > current_tracer 16 } 17 18 reset_trigger() { # reset all current setting triggers 19 grep -v ^# events/*/*/trigger | 20 while read line; do 21 cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "` 22 echo "!$cmd" > `echo $line | cut -f1 -d:` 23 done 24 } 25 26 reset_events_filter() { # reset all current setting filters 27 grep -v ^none events/*/*/filter | 28 while read line; do 29 echo 0 > `echo $line | cut -f1 -d:` 30 done 31 } 32 33 reset_ftrace_filter() { # reset all triggers in set_ftrace_filter 34 echo > set_ftrace_filter 35 grep -v '^#' set_ftrace_filter | while read t; do 36 tr=`echo $t | cut -d: -f2` 37 if [ "$tr" = "" ]; then 38 continue 39 fi 40 if [ $tr = "enable_event" -o $tr = "disable_event" ]; then 41 tr=`echo $t | cut -d: -f1-4` 42 limit=`echo $t | cut -d: -f5` 43 else 44 tr=`echo $t | cut -d: -f1-2` 45 limit=`echo $t | cut -d: -f3` 46 fi 47 if [ "$limit" != "unlimited" ]; then 48 tr="$tr:$limit" 49 fi 50 echo "!$tr" > set_ftrace_filter 51 done 52 } 53 54 disable_events() { 55 echo 0 > events/enable 56 } 57 58 initialize_ftrace() { # Reset ftrace to initial-state 59 # As the initial state, ftrace will be set to nop tracer, 60 # no events, no triggers, no filters, no function filters, 61 # no probes, and tracing on. 62 disable_tracing 63 reset_tracer 64 reset_trigger 65 reset_events_filter 66 disable_events 67 echo > set_event_pid # event tracer is always on 68 [ -f set_ftrace_filter ] && echo | tee set_ftrace_* 69 [ -f set_graph_function ] && echo | tee set_graph_* 70 [ -f stack_trace_filter ] && echo > stack_trace_filter 71 [ -f kprobe_events ] && echo > kprobe_events 72 [ -f uprobe_events ] && echo > uprobe_events 73 enable_tracing 74 } 75
