1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook
#define _GNU_SOURCE
#include <pthread.h>
#include <sched.h>
#include <test_progs.h>
#include "perf_event_stackmap.skel.h"
#ifndef noinline
#define noinline __attribute__((noinline))
#endif
noinline int func_1(void)
{
static int val = 1;
val += 1;
usleep(100);
return val;
}
noinline int func_2(void)
{
return func_1();
}
noinline int func_3(void)
{
return func_2();
}
noinline int func_4(void)
{
return func_3();
}
noinline int func_5(void)
{
return func_4();
}
noinline int func_6(void)
{
int i, val = 1;
for (i = 0; i < 100; i++)
val += func_5();
return val;
}
void test_perf_event_stackmap(void)
{
struct perf_event_attr attr = {
/* .type = PERF_TYPE_SOFTWARE, */
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES,
.precise_ip = 2,
.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
PERF_SAMPLE_CALLCHAIN,
.branch_sample_type = PERF_SAMPLE_BRANCH_USER |
PERF_SAMPLE_BRANCH_NO_FLAGS |
PERF_SAMPLE_BRANCH_NO_CYCLES |
PERF_SAMPLE_BRANCH_CALL_STACK,
.sample_period = 5000,
.size = sizeof(struct perf_event_attr),
};
struct perf_event_stackmap *skel;
__u32 duration = 0;
cpu_set_t cpu_set;
int pmu_fd, err;
skel = perf_event_stackmap__open();
if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
return;
err = perf_event_stackmap__load(skel);
if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
goto cleanup;
CPU_ZERO(&cpu_set);
CPU_SET(0, &cpu_set);
err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
goto cleanup;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
0 /* cpu 0 */, -1 /* group id */,
0 /* flags */);
if (pmu_fd < 0) {
printf("%s:SKIP:cpu doesn't support the event\n", __func__);
test__skip();
goto cleanup;
}
skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
pmu_fd);
if (CHECK(IS_ERR(skel->links.oncpu), "attach_perf_event",
"err %ld\n", PTR_ERR(skel->links.oncpu))) {
close(pmu_fd);
goto cleanup;
}
/* create kernel and user stack traces for testing */
func_6();
CHECK(skel->data->stackid_kernel != 2, "get_stackid_kernel", "failed\n");
CHECK(skel->data->stackid_user != 2, "get_stackid_user", "failed\n");
CHECK(skel->data->stack_kernel != 2, "get_stack_kernel", "failed\n");
CHECK(skel->data->stack_user != 2, "get_stack_user", "failed\n");
cleanup:
perf_event_stackmap__destroy(skel);
}
|
