Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/sh
2# perf pipe recording and injection test
3# SPDX-License-Identifier: GPL-2.0
4
5# skip if there's no compiler
6if ! [ -x "$(command -v cc)" ]; then
7 echo "failed: no compiler, install gcc"
8 exit 2
9fi
10
11file=$(mktemp /tmp/test.file.XXXXXX)
12data=$(mktemp /tmp/perf.data.XXXXXX)
13
14cat <<EOF | cc -o ${file} -x c -
15#include <signal.h>
16#include <stdlib.h>
17#include <unistd.h>
18
19volatile int done;
20
21void sigalrm(int sig) {
22 done = 1;
23}
24
25__attribute__((noinline)) void noploop(void) {
26 while (!done)
27 continue;
28}
29
30int main(int argc, char *argv[]) {
31 int sec = 1;
32
33 if (argc > 1)
34 sec = atoi(argv[1]);
35
36 signal(SIGALRM, sigalrm);
37 alarm(sec);
38
39 noploop();
40 return 0;
41}
42EOF
43
44
45if ! perf record -e task-clock:u -o - ${file} | perf report -i - --task | grep test.file; then
46 echo "cannot find the test file in the perf report"
47 exit 1
48fi
49
50if ! perf record -e task-clock:u -o - ${file} | perf inject -b | perf report -i - | grep noploop; then
51 echo "cannot find noploop function in pipe #1"
52 exit 1
53fi
54
55perf record -e task-clock:u -o - ${file} | perf inject -b -o ${data}
56if ! perf report -i ${data} | grep noploop; then
57 echo "cannot find noploop function in pipe #2"
58 exit 1
59fi
60
61perf record -e task-clock:u -o ${data} ${file}
62if ! perf inject -b -i ${data} | perf report -i - | grep noploop; then
63 echo "cannot find noploop function in pipe #3"
64 exit 1
65fi
66
67
68rm -f ${file} ${data} ${data}.old
69exit 0