Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/bash
2# perf ftrace tests
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7# perf ftrace commands only works for root
8if [ "$(id -u)" != 0 ]; then
9 echo "perf ftrace test [Skipped: no permission]"
10 exit 2
11fi
12
13output=$(mktemp /tmp/__perf_test.ftrace.XXXXXX)
14
15cleanup() {
16 rm -f "${output}"
17
18 trap - EXIT TERM INT
19}
20
21trap_cleanup() {
22 cleanup
23 exit 1
24}
25trap trap_cleanup EXIT TERM INT
26
27# this will be set in test_ftrace_trace()
28target_function=
29
30test_ftrace_list() {
31 echo "perf ftrace list test"
32 perf ftrace -F > "${output}"
33 # this will be used in test_ftrace_trace()
34 sleep_functions=$(grep 'sys_.*sleep$' "${output}")
35 echo "syscalls for sleep:"
36 echo "${sleep_functions}"
37 echo "perf ftrace list test [Success]"
38}
39
40test_ftrace_trace() {
41 echo "perf ftrace trace test"
42 perf ftrace trace --graph-opts depth=5 sleep 0.1 > "${output}"
43 # it should have some function name contains 'sleep'
44 grep "^#" "${output}"
45 grep -F 'sleep()' "${output}"
46 # find actual syscall function name
47 for FN in ${sleep_functions}; do
48 if grep -q "${FN}" "${output}"; then
49 target_function="${FN}"
50 echo "perf ftrace trace test [Success]"
51 return
52 fi
53 done
54
55 echo "perf ftrace trace test [Failure: sleep syscall not found]"
56 exit 1
57}
58
59test_ftrace_latency() {
60 echo "perf ftrace latency test"
61 echo "target function: ${target_function}"
62 perf ftrace latency -T "${target_function}" sleep 0.1 > "${output}"
63 grep "^#" "${output}"
64 grep "###" "${output}"
65 echo "perf ftrace latency test [Success]"
66}
67
68test_ftrace_profile() {
69 echo "perf ftrace profile test"
70 perf ftrace profile --graph-opts depth=5 sleep 0.1 > "${output}"
71 grep ^# "${output}"
72 time_re="[[:space:]]+1[[:digit:]]{5}\.[[:digit:]]{3}"
73 # 100283.000 100283.000 100283.000 1 __x64_sys_clock_nanosleep
74 # Check for one *clock_nanosleep line with a Count of just 1 that takes a bit more than 0.1 seconds
75 # Strip the _x64_sys part to work with other architectures
76 grep -E "^${time_re}${time_re}${time_re}[[:space:]]+1[[:space:]]+.*clock_nanosleep" "${output}"
77 echo "perf ftrace profile test [Success]"
78}
79
80test_ftrace_list
81test_ftrace_trace
82test_ftrace_latency
83test_ftrace_profile
84
85cleanup
86exit 0