Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1clear_trace() { # reset trace output
2 echo > trace
3}
4
5disable_tracing() { # stop trace recording
6 echo 0 > tracing_on
7}
8
9enable_tracing() { # start trace recording
10 echo 1 > tracing_on
11}
12
13reset_tracer() { # reset the current tracer
14 echo nop > current_tracer
15}
16
17reset_trigger_file() {
18 # remove action triggers first
19 grep -H ':on[^:]*(' $@ |
20 while read line; do
21 cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
22 file=`echo $line | cut -f1 -d:`
23 echo "!$cmd" >> $file
24 done
25 grep -Hv ^# $@ |
26 while read line; do
27 cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
28 file=`echo $line | cut -f1 -d:`
29 echo "!$cmd" > $file
30 done
31}
32
33reset_trigger() { # reset all current setting triggers
34 if [ -d events/synthetic ]; then
35 reset_trigger_file events/synthetic/*/trigger
36 fi
37 reset_trigger_file events/*/*/trigger
38}
39
40reset_events_filter() { # reset all current setting filters
41 grep -v ^none events/*/*/filter |
42 while read line; do
43 echo 0 > `echo $line | cut -f1 -d:`
44 done
45}
46
47reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
48 if [ ! -f set_ftrace_filter ]; then
49 return 0
50 fi
51 echo > set_ftrace_filter
52 grep -v '^#' set_ftrace_filter | while read t; do
53 tr=`echo $t | cut -d: -f2`
54 if [ "$tr" = "" ]; then
55 continue
56 fi
57 if ! grep -q "$t" set_ftrace_filter; then
58 continue;
59 fi
60 name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
61 if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
62 tr=`echo $t | cut -d: -f2-4`
63 limit=`echo $t | cut -d: -f5`
64 else
65 tr=`echo $t | cut -d: -f2`
66 limit=`echo $t | cut -d: -f3`
67 fi
68 if [ "$limit" != "unlimited" ]; then
69 tr="$tr:$limit"
70 fi
71 echo "!$name:$tr" > set_ftrace_filter
72 done
73}
74
75disable_events() {
76 echo 0 > events/enable
77}
78
79clear_synthetic_events() { # reset all current synthetic events
80 grep -v ^# synthetic_events |
81 while read line; do
82 echo "!$line" >> synthetic_events
83 done
84}
85
86clear_dynamic_events() { # reset all current dynamic events
87 again=1
88 stop=1
89 # loop mulitple times as some events require other to be removed first
90 while [ $again -eq 1 ]; do
91 stop=$((stop+1))
92 # Prevent infinite loops
93 if [ $stop -gt 10 ]; then
94 break;
95 fi
96 again=2
97 grep -v '^#' dynamic_events|
98 while read line; do
99 del=`echo $line | sed -e 's/^.\([^ ]*\).*/-\1/'`
100 if ! echo "$del" >> dynamic_events; then
101 again=1
102 fi
103 done
104 done
105}
106
107initialize_system() { # Reset ftrace to initial-state
108# As the initial state, ftrace will be set to nop tracer,
109# no events, no triggers, no filters, no function filters,
110# no probes, and tracing on.
111 disable_tracing
112 reset_tracer
113 reset_trigger
114 reset_events_filter
115 reset_ftrace_filter
116 disable_events
117 clear_dynamic_events
118 [ -f set_event_pid ] && echo > set_event_pid
119 [ -f set_ftrace_pid ] && echo > set_ftrace_pid
120 [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
121 [ -f set_graph_function ] && echo | tee set_graph_*
122 [ -f stack_trace_filter ] && echo > stack_trace_filter
123 [ -f kprobe_events ] && echo > kprobe_events
124 [ -f uprobe_events ] && echo > uprobe_events
125 [ -f synthetic_events ] && echo > synthetic_events
126 [ -f snapshot ] && echo 0 > snapshot
127
128# Stop tracing while reading the trace file by default, to prevent
129# the test results while checking it and to avoid taking a long time
130# to check the result.
131 [ -f options/pause-on-trace ] && echo 1 > options/pause-on-trace
132
133 clear_trace
134 enable_tracing
135}
136
137finish_system() {
138 initialize_system
139# And recover it to default.
140 [ -f options/pause-on-trace ] && echo 0 > options/pause-on-trace
141}
142
143check_requires() { # Check required files and tracers
144 for i in "$@" ; do
145 p=${i%:program}
146 r=${i%:README}
147 t=${i%:tracer}
148 if [ $p != $i ]; then
149 if ! which $p ; then
150 echo "Required program $p is not found."
151 exit_unresolved
152 fi
153 elif [ $t != $i ]; then
154 if ! grep -wq $t available_tracers ; then
155 echo "Required tracer $t is not configured."
156 exit_unsupported
157 fi
158 elif [ "$r" != "$i" ]; then
159 # If this is an instance, check the top directory
160 if echo $TRACING_DIR | grep -q "/instances/"; then
161 test="$TRACING_DIR/../.."
162 else
163 test=$TRACING_DIR
164 fi
165 if ! grep -Fq "$r" $test/README ; then
166 echo "Required feature pattern \"$r\" is not in README."
167 exit_unsupported
168 fi
169 elif [ ! -e $i ]; then
170 echo "Required feature interface $i doesn't exist."
171 exit_unsupported
172 fi
173 done
174}
175
176LOCALHOST=127.0.0.1
177
178yield() {
179 ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
180}
181
182# The fork function in the kernel was renamed from "_do_fork" to
183# "kernel_fork". As older tests should still work with older kernels
184# as well as newer kernels, check which version of fork is used on this
185# kernel so that the tests can use the fork function for the running kernel.
186FUNCTION_FORK=`(if grep '\bkernel_clone\b' /proc/kallsyms > /dev/null; then
187 echo kernel_clone; else echo '_do_fork'; fi)`
188
189# Since probe event command may include backslash, explicitly use printf "%s"
190# to NOT interpret it.
191ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
192 pos=$(printf "%s" "${2%^*}" | wc -c) # error position
193 command=$(printf "%s" "$2" | tr -d ^)
194 echo "Test command: $command"
195 echo > error_log
196 (! printf "%s" "$command" >> "$3" ) 2> /dev/null
197 grep "$1: error:" -A 3 error_log
198 N=$(tail -n 1 error_log | wc -c)
199 # " Command: " and "^\n" => 13
200 test $(expr 13 + $pos) -eq $N
201}
202
203# Helper to get the tracefs mount point
204get_mount_point() {
205 local mount_point=`stat -c '%m' .`
206
207 # If stat -c '%m' does not work (e.g. busybox) or failed, try to use the
208 # current working directory (which should be a tracefs) as the mount point.
209 if [ ! -d "$mount_point" ]; then
210 if mount | grep -qw "$PWD"; then
211 mount_point=$PWD
212 else
213 # If PWD doesn't work, that is an environmental problem.
214 exit_unresolved
215 fi
216 fi
217 echo "$mount_point"
218}
219
220# Helper function to retrieve mount options for a given mount point
221get_mnt_options() {
222 local mnt_point="$1"
223 local opts=$(mount | grep -m1 "$mnt_point" | sed -e 's/.*(\(.*\)).*/\1/')
224
225 echo "$opts"
226}