1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 Facebook
3 #define _GNU_SOURCE
4 #include <pthread.h>
5 #include <sched.h>
6 #include <test_progs.h>
7 #include "perf_event_stackmap.skel.h"
8
9 #ifndef noinline
10 #define noinline __attribute__((noinline))
11 #endif
12
13 noinline int func_1(void)
14 {
15 static int val = 1;
16
17 val += 1;
18
19 usleep(100);
20 return val;
21 }
22
23 noinline int func_2(void)
24 {
25 return func_1();
26 }
27
28 noinline int func_3(void)
29 {
30 return func_2();
31 }
32
33 noinline int func_4(void)
34 {
35 return func_3();
36 }
37
38 noinline int func_5(void)
39 {
40 return func_4();
41 }
42
43 noinline int func_6(void)
44 {
45 int i, val = 1;
46
47 for (i = 0; i < 100; i++)
48 val += func_5();
49
50 return val;
51 }
52
53 void test_perf_event_stackmap(void)
54 {
55 struct perf_event_attr attr = {
56 /* .type = PERF_TYPE_SOFTWARE, */
57 .type = PERF_TYPE_HARDWARE,
58 .config = PERF_COUNT_HW_CPU_CYCLES,
59 .precise_ip = 2,
60 .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
61 PERF_SAMPLE_CALLCHAIN,
62 .branch_sample_type = PERF_SAMPLE_BRANCH_USER |
63 PERF_SAMPLE_BRANCH_NO_FLAGS |
64 PERF_SAMPLE_BRANCH_NO_CYCLES |
65 PERF_SAMPLE_BRANCH_CALL_STACK,
66 .freq = 1,
67 .sample_freq = read_perf_max_sample_freq(),
68 .size = sizeof(struct perf_event_attr),
69 };
70 struct perf_event_stackmap *skel;
71 __u32 duration = 0;
72 cpu_set_t cpu_set;
73 int pmu_fd, err;
74
75 skel = perf_event_stackmap__open();
76
77 if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
78 return;
79
80 err = perf_event_stackmap__load(skel);
81 if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
82 goto cleanup;
83
84 CPU_ZERO(&cpu_set);
85 CPU_SET(0, &cpu_set);
86 err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
87 if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
88 goto cleanup;
89
90 pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
91 0 /* cpu 0 */, -1 /* group id */,
92 0 /* flags */);
93 if (pmu_fd < 0) {
94 printf("%s:SKIP:cpu doesn't support the event\n", __func__);
95 test__skip();
96 goto cleanup;
97 }
98
99 skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
100 pmu_fd);
101 if (!ASSERT_OK_PTR(skel->links.oncpu, "attach_perf_event")) {
102 close(pmu_fd);
103 goto cleanup;
104 }
105
106 /* create kernel and user stack traces for testing */
107 func_6();
108
109 CHECK(skel->data->stackid_kernel != 2, "get_stackid_kernel", "failed\n");
110 CHECK(skel->data->stackid_user != 2, "get_stackid_user", "failed\n");
111 CHECK(skel->data->stack_kernel != 2, "get_stack_kernel", "failed\n");
112 CHECK(skel->data->stack_user != 2, "get_stack_user", "failed\n");
113
114 cleanup:
115 perf_event_stackmap__destroy(skel);
116 }
117
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.