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	if ! grep -q "$t" set_ftrace_filter; then
41		continue;
42	fi
43	name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
44	if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
45	    tr=`echo $t | cut -d: -f2-4`
46	    limit=`echo $t | cut -d: -f5`
47	else
48	    tr=`echo $t | cut -d: -f2`
49	    limit=`echo $t | cut -d: -f3`
50	fi
51	if [ "$limit" != "unlimited" ]; then
52	    tr="$tr:$limit"
53	fi
54	echo "!$name:$tr" > set_ftrace_filter
55    done
56}
57
58disable_events() {
59    echo 0 > events/enable
60}
61
62initialize_ftrace() { # Reset ftrace to initial-state
63# As the initial state, ftrace will be set to nop tracer,
64# no events, no triggers, no filters, no function filters,
65# no probes, and tracing on.
66    disable_tracing
67    reset_tracer
68    reset_trigger
69    reset_events_filter
70    disable_events
71    echo > set_event_pid	# event tracer is always on
72    [ -f set_ftrace_filter ] && echo | tee set_ftrace_*
73    [ -f set_graph_function ] && echo | tee set_graph_*
74    [ -f stack_trace_filter ] && echo > stack_trace_filter
75    [ -f kprobe_events ] && echo > kprobe_events
76    [ -f uprobe_events ] && echo > uprobe_events
77    enable_tracing
78}
79