1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 # description: event tracing - restricts events based on pid notrace filtering
4 # requires: set_event events/sched set_event_pid set_event_notrace_pid
5 # flags: instance
6
7 do_reset() {
8 echo > set_event
9 echo > set_event_pid
10 echo > set_event_notrace_pid
11 echo 0 > options/event-fork
12 echo 0 > events/enable
13 clear_trace
14 echo 1 > tracing_on
15 }
16
17 fail() { #msg
18 cat trace
19 do_reset
20 echo $1
21 exit_fail
22 }
23
24 count_pid() {
25 pid=$@
26 cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
27 }
28
29 count_no_pid() {
30 pid=$1
31 cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
32 }
33
34 enable_system() {
35 system=$1
36
37 if [ -d events/$system ]; then
38 echo 1 > events/$system/enable
39 fi
40 }
41
42 enable_events() {
43 echo 0 > tracing_on
44 # Enable common groups of events, as all events can allow for
45 # events to be traced via scheduling that we don't care to test.
46 enable_system syscalls
47 enable_system rcu
48 enable_system block
49 enable_system exceptions
50 enable_system irq
51 enable_system net
52 enable_system power
53 enable_system signal
54 enable_system sock
55 enable_system timer
56 enable_system thermal
57 echo 1 > tracing_on
58 }
59
60 other_task() {
61 sleep .001 || usleep 1 || sleep 1
62 }
63
64 echo 0 > options/event-fork
65
66 do_reset
67
68 read mypid rest < /proc/self/stat
69
70 echo $mypid > set_event_notrace_pid
71 grep -q $mypid set_event_notrace_pid
72
73 enable_events
74
75 yield
76
77 echo 0 > tracing_on
78
79 cnt=`count_pid $mypid`
80 if [ $cnt -ne 0 ]; then
81 fail "Filtered out task has events"
82 fi
83
84 cnt=`count_no_pid $mypid`
85 if [ $cnt -eq 0 ]; then
86 fail "No other events were recorded"
87 fi
88
89 do_reset
90
91 echo $mypid > set_event_notrace_pid
92 echo 1 > options/event-fork
93
94 enable_events
95
96 yield &
97 child=$!
98 echo "child = $child"
99 wait $child
100
101 # Be sure some other events will happen for small systems (e.g. 1 core)
102 other_task
103
104 echo 0 > tracing_on
105
106 cnt=`count_pid $mypid`
107 if [ $cnt -ne 0 ]; then
108 fail "Filtered out task has events"
109 fi
110
111 cnt=`count_pid $child`
112 if [ $cnt -ne 0 ]; then
113 fail "Child of filtered out taskhas events"
114 fi
115
116 cnt=`count_no_pid $mypid`
117 if [ $cnt -eq 0 ]; then
118 fail "No other events were recorded"
119 fi
120
121 do_reset
122
123 exit 0
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