1
2clear_trace() { # reset trace output
3    echo > trace
4}
5
6disable_tracing() { # stop trace recording
7    echo 0 > tracing_on
8}
9
10enable_tracing() { # start trace recording
11    echo 1 > tracing_on
12}
13
14reset_tracer() { # reset the current tracer
15    echo nop > current_tracer
16}
17
18reset_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
26reset_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
33reset_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	name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
41	if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
42	    tr=`echo $t | cut -d: -f2-4`
43	    limit=`echo $t | cut -d: -f5`
44	else
45	    tr=`echo $t | cut -d: -f2`
46	    limit=`echo $t | cut -d: -f3`
47	fi
48	if [ "$limit" != "unlimited" ]; then
49	    tr="$tr:$limit"
50	fi
51	echo "!$name:$tr" > set_ftrace_filter
52    done
53}
54
55disable_events() {
56    echo 0 > events/enable
57}
58
59initialize_ftrace() { # Reset ftrace to initial-state
60# As the initial state, ftrace will be set to nop tracer,
61# no events, no triggers, no filters, no function filters,
62# no probes, and tracing on.
63    disable_tracing
64    reset_tracer
65    reset_trigger
66    reset_events_filter
67    disable_events
68    echo > set_event_pid	# event tracer is always on
69    [ -f set_ftrace_filter ] && echo | tee set_ftrace_*
70    [ -f set_graph_function ] && echo | tee set_graph_*
71    [ -f stack_trace_filter ] && echo > stack_trace_filter
72    [ -f kprobe_events ] && echo > kprobe_events
73    [ -f uprobe_events ] && echo > uprobe_events
74    enable_tracing
75}
76