projects/linux·blob master · refs

110 lines · 2.8 KiB

1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0-only
3
4clear_trace() { # reset trace output
5 echo > trace
6}
7
8disable_tracing() { # stop trace recording
9 echo 0 > tracing_on
10}
11
12enable_tracing() { # start trace recording
13 echo 1 > tracing_on
14}
15
16reset_tracer() { # reset the current tracer
17 echo nop > current_tracer
18}
19
20reset_trigger_file() {
21 # remove action triggers first
22 grep -H ':on[^:]*(' $@ |
23 while read line; do
24 cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
25 file=`echo $line | cut -f1 -d:`
26 echo "!$cmd" >> $file
27 done
28 grep -Hv ^# $@ |
29 while read line; do
30 cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
31 file=`echo $line | cut -f1 -d:`
32 echo "!$cmd" > $file
33 done
34}
35
36reset_trigger() { # reset all current setting triggers
37 if [ -d events/synthetic ]; then
38 reset_trigger_file events/synthetic/*/trigger
39 fi
40 reset_trigger_file events/*/*/trigger
41}
42
43reset_events_filter() { # reset all current setting filters
44 grep -v ^none events/*/*/filter |
45 while read line; do
46 echo 0 > `echo $line | cut -f1 -d:`
47 done
48}
49
50reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
51 if [ ! -f set_ftrace_filter ]; then
52 return 0
53 fi
54 echo > set_ftrace_filter
55 grep -v '^#' set_ftrace_filter | while read t; do
56 tr=`echo $t | cut -d: -f2`
57 if [ "$tr" = "" ]; then
58 continue
59 fi
60 if ! grep -q "$t" set_ftrace_filter; then
61 continue;
62 fi
63 name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
64 if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
65 tr=`echo $t | cut -d: -f2-4`
66 limit=`echo $t | cut -d: -f5`
67 else
68 tr=`echo $t | cut -d: -f2`
69 limit=`echo $t | cut -d: -f3`
70 fi
71 if [ "$limit" != "unlimited" ]; then
72 tr="$tr:$limit"
73 fi
74 echo "!$name:$tr" > set_ftrace_filter
75 done
76}
77
78disable_events() {
79 echo 0 > events/enable
80}
81
82clear_synthetic_events() { # reset all current synthetic events
83 grep -v ^# synthetic_events |
84 while read line; do
85 echo "!$line" >> synthetic_events
86 done
87}
88
89initialize_ftrace() { # Reset ftrace to initial-state
90# As the initial state, ftrace will be set to nop tracer,
91# no events, no triggers, no filters, no function filters,
92# no probes, and tracing on.
93 disable_tracing
94 reset_tracer
95 reset_trigger
96 reset_events_filter
97 reset_ftrace_filter
98 disable_events
99 [ -f set_event_pid ] && echo > set_event_pid
100 [ -f set_ftrace_pid ] && echo > set_ftrace_pid
101 [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
102 [ -f set_graph_function ] && echo | tee set_graph_*
103 [ -f stack_trace_filter ] && echo > stack_trace_filter
104 [ -f kprobe_events ] && echo > kprobe_events
105 [ -f uprobe_events ] && echo > uprobe_events
106 [ -f synthetic_events ] && echo > synthetic_events
107 [ -f snapshot ] && echo 0 > snapshot
108 clear_trace
109 enable_tracing
110}