This source file includes following definitions.
- test__basic_mmap
1
2 #include <errno.h>
3 #include <inttypes.h>
4
5 #include <pthread.h>
6 #include <stdlib.h>
7 #include <perf/cpumap.h>
8
9 #include "debug.h"
10 #include "evlist.h"
11 #include "evsel.h"
12 #include "thread_map.h"
13 #include "tests.h"
14 #include "util/mmap.h"
15 #include <linux/err.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <perf/evlist.h>
19
20
21
22
23
24
25
26
27
28
29
30
31 int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused)
32 {
33 int err = -1;
34 union perf_event *event;
35 struct perf_thread_map *threads;
36 struct perf_cpu_map *cpus;
37 struct evlist *evlist;
38 cpu_set_t cpu_set;
39 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
40 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
41 #define nsyscalls ARRAY_SIZE(syscall_names)
42 unsigned int nr_events[nsyscalls],
43 expected_nr_events[nsyscalls], i, j;
44 struct evsel *evsels[nsyscalls], *evsel;
45 char sbuf[STRERR_BUFSIZE];
46 struct mmap *md;
47
48 threads = thread_map__new(-1, getpid(), UINT_MAX);
49 if (threads == NULL) {
50 pr_debug("thread_map__new\n");
51 return -1;
52 }
53
54 cpus = perf_cpu_map__new(NULL);
55 if (cpus == NULL) {
56 pr_debug("perf_cpu_map__new\n");
57 goto out_free_threads;
58 }
59
60 CPU_ZERO(&cpu_set);
61 CPU_SET(cpus->map[0], &cpu_set);
62 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
63 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
64 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
65 cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf)));
66 goto out_free_cpus;
67 }
68
69 evlist = evlist__new();
70 if (evlist == NULL) {
71 pr_debug("perf_evlist__new\n");
72 goto out_free_cpus;
73 }
74
75 perf_evlist__set_maps(&evlist->core, cpus, threads);
76
77 for (i = 0; i < nsyscalls; ++i) {
78 char name[64];
79
80 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
81 evsels[i] = perf_evsel__newtp("syscalls", name);
82 if (IS_ERR(evsels[i])) {
83 pr_debug("perf_evsel__new(%s)\n", name);
84 goto out_delete_evlist;
85 }
86
87 evsels[i]->core.attr.wakeup_events = 1;
88 perf_evsel__set_sample_id(evsels[i], false);
89
90 evlist__add(evlist, evsels[i]);
91
92 if (evsel__open(evsels[i], cpus, threads) < 0) {
93 pr_debug("failed to open counter: %s, "
94 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
95 str_error_r(errno, sbuf, sizeof(sbuf)));
96 goto out_delete_evlist;
97 }
98
99 nr_events[i] = 0;
100 expected_nr_events[i] = 1 + rand() % 127;
101 }
102
103 if (evlist__mmap(evlist, 128) < 0) {
104 pr_debug("failed to mmap events: %d (%s)\n", errno,
105 str_error_r(errno, sbuf, sizeof(sbuf)));
106 goto out_delete_evlist;
107 }
108
109 for (i = 0; i < nsyscalls; ++i)
110 for (j = 0; j < expected_nr_events[i]; ++j) {
111 int foo = syscalls[i]();
112 ++foo;
113 }
114
115 md = &evlist->mmap[0];
116 if (perf_mmap__read_init(md) < 0)
117 goto out_init;
118
119 while ((event = perf_mmap__read_event(md)) != NULL) {
120 struct perf_sample sample;
121
122 if (event->header.type != PERF_RECORD_SAMPLE) {
123 pr_debug("unexpected %s event\n",
124 perf_event__name(event->header.type));
125 goto out_delete_evlist;
126 }
127
128 err = perf_evlist__parse_sample(evlist, event, &sample);
129 if (err) {
130 pr_err("Can't parse sample, err = %d\n", err);
131 goto out_delete_evlist;
132 }
133
134 err = -1;
135 evsel = perf_evlist__id2evsel(evlist, sample.id);
136 if (evsel == NULL) {
137 pr_debug("event with id %" PRIu64
138 " doesn't map to an evsel\n", sample.id);
139 goto out_delete_evlist;
140 }
141 nr_events[evsel->idx]++;
142 perf_mmap__consume(md);
143 }
144 perf_mmap__read_done(md);
145
146 out_init:
147 err = 0;
148 evlist__for_each_entry(evlist, evsel) {
149 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
150 pr_debug("expected %d %s events, got %d\n",
151 expected_nr_events[evsel->idx],
152 perf_evsel__name(evsel), nr_events[evsel->idx]);
153 err = -1;
154 goto out_delete_evlist;
155 }
156 }
157
158 out_delete_evlist:
159 evlist__delete(evlist);
160 cpus = NULL;
161 threads = NULL;
162 out_free_cpus:
163 perf_cpu_map__put(cpus);
164 out_free_threads:
165 perf_thread_map__put(threads);
166 return err;
167 }