tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7do_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
17fail() { #msg
18 cat trace
19 do_reset
20 echo $1
21 exit_fail
22}
23
24count_pid() {
25 pid=$@
26 cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
27}
28
29count_no_pid() {
30 pid=$1
31 cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
32}
33
34enable_system() {
35 system=$1
36
37 if [ -d events/$system ]; then
38 echo 1 > events/$system/enable
39 fi
40}
41
42enable_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
60other_task() {
61 sleep .001 || usleep 1 || sleep 1
62}
63
64echo 0 > options/event-fork
65
66do_reset
67
68read mypid rest < /proc/self/stat
69
70echo $mypid > set_event_notrace_pid
71grep -q $mypid set_event_notrace_pid
72
73enable_events
74
75yield
76
77echo 0 > tracing_on
78
79cnt=`count_pid $mypid`
80if [ $cnt -ne 0 ]; then
81 fail "Filtered out task has events"
82fi
83
84cnt=`count_no_pid $mypid`
85if [ $cnt -eq 0 ]; then
86 fail "No other events were recorded"
87fi
88
89do_reset
90
91echo $mypid > set_event_notrace_pid
92echo 1 > options/event-fork
93
94enable_events
95
96yield &
97child=$!
98echo "child = $child"
99wait $child
100
101# Be sure some other events will happen for small systems (e.g. 1 core)
102other_task
103
104echo 0 > tracing_on
105
106cnt=`count_pid $mypid`
107if [ $cnt -ne 0 ]; then
108 fail "Filtered out task has events"
109fi
110
111cnt=`count_pid $child`
112if [ $cnt -ne 0 ]; then
113 fail "Child of filtered out taskhas events"
114fi
115
116cnt=`count_no_pid $mypid`
117if [ $cnt -eq 0 ]; then
118 fail "No other events were recorded"
119fi
120
121do_reset
122
123exit 0