1 // SPDX-License-Identifier: GPL-2.0
4 /* For the CLR_() macros */
7 #include <perf/cpumap.h>
12 #include "thread_map.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>
21 * This test will generate random numbers of calls to some getpid syscalls,
22 * then establish an mmap for a group of events that are created to monitor
25 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
26 * sample.id field to map back to its respective perf_evsel instance.
28 * Then it checks if the number of syscalls reported as perf events by
29 * the kernel corresponds to the number of syscalls made.
31 int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused)
34 union perf_event *event;
35 struct perf_thread_map *threads;
36 struct perf_cpu_map *cpus;
37 struct evlist *evlist;
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];
48 threads = thread_map__new(-1, getpid(), UINT_MAX);
49 if (threads == NULL) {
50 pr_debug("thread_map__new\n");
54 cpus = perf_cpu_map__new(NULL);
56 pr_debug("perf_cpu_map__new\n");
57 goto out_free_threads;
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)));
69 evlist = evlist__new();
71 pr_debug("perf_evlist__new\n");
75 perf_evlist__set_maps(&evlist->core, cpus, threads);
77 for (i = 0; i < nsyscalls; ++i) {
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;
87 evsels[i]->core.attr.wakeup_events = 1;
88 perf_evsel__set_sample_id(evsels[i], false);
90 evlist__add(evlist, evsels[i]);
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;
100 expected_nr_events[i] = 1 + rand() % 127;
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;
109 for (i = 0; i < nsyscalls; ++i)
110 for (j = 0; j < expected_nr_events[i]; ++j) {
111 int foo = syscalls[i]();
115 md = &evlist->mmap[0];
116 if (perf_mmap__read_init(md) < 0)
119 while ((event = perf_mmap__read_event(md)) != NULL) {
120 struct perf_sample sample;
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;
128 err = perf_evlist__parse_sample(evlist, event, &sample);
130 pr_err("Can't parse sample, err = %d\n", err);
131 goto out_delete_evlist;
135 evsel = perf_evlist__id2evsel(evlist, sample.id);
137 pr_debug("event with id %" PRIu64
138 " doesn't map to an evsel\n", sample.id);
139 goto out_delete_evlist;
141 nr_events[evsel->idx]++;
142 perf_mmap__consume(md);
144 perf_mmap__read_done(md);
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]);
154 goto out_delete_evlist;
159 evlist__delete(evlist);
163 perf_cpu_map__put(cpus);
165 perf_thread_map__put(threads);