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 [ $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
54disable_events() {
55    echo 0 > events/enable
56}
57
58initialize_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