tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
62clear_synthetic_events() { # reset all current synthetic events
63 grep -v ^# synthetic_events |
64 while read line; do
65 echo "!$line" >> synthetic_events
66 done
67}
68
69initialize_ftrace() { # Reset ftrace to initial-state
70# As the initial state, ftrace will be set to nop tracer,
71# no events, no triggers, no filters, no function filters,
72# no probes, and tracing on.
73 disable_tracing
74 reset_tracer
75 reset_trigger
76 reset_events_filter
77 disable_events
78 echo > set_event_pid # event tracer is always on
79 [ -f set_ftrace_filter ] && echo | tee set_ftrace_*
80 [ -f set_graph_function ] && echo | tee set_graph_*
81 [ -f stack_trace_filter ] && echo > stack_trace_filter
82 [ -f kprobe_events ] && echo > kprobe_events
83 [ -f uprobe_events ] && echo > uprobe_events
84 enable_tracing
85}