1 // SPDX-License-Identifier: GPL-2.0
4 /* For the CLR_() macros */
7 #include <perf/cpumap.h>
12 #include "thread_map.h"
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <perf/evlist.h>
20 * This test will generate random numbers of calls to some getpid syscalls,
21 * then establish an mmap for a group of events that are created to monitor
24 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
25 * sample.id field to map back to its respective perf_evsel instance.
27 * Then it checks if the number of syscalls reported as perf events by
28 * the kernel corresponds to the number of syscalls made.
30 int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused)
33 union perf_event *event;
34 struct perf_thread_map *threads;
35 struct perf_cpu_map *cpus;
36 struct evlist *evlist;
38 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
39 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
40 #define nsyscalls ARRAY_SIZE(syscall_names)
41 unsigned int nr_events[nsyscalls],
42 expected_nr_events[nsyscalls], i, j;
43 struct evsel *evsels[nsyscalls], *evsel;
44 char sbuf[STRERR_BUFSIZE];
47 threads = thread_map__new(-1, getpid(), UINT_MAX);
48 if (threads == NULL) {
49 pr_debug("thread_map__new\n");
53 cpus = perf_cpu_map__new(NULL);
55 pr_debug("perf_cpu_map__new\n");
56 goto out_free_threads;
60 CPU_SET(cpus->map[0], &cpu_set);
61 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
62 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
63 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
64 cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf)));
68 evlist = evlist__new();
70 pr_debug("perf_evlist__new\n");
74 perf_evlist__set_maps(&evlist->core, cpus, threads);
76 for (i = 0; i < nsyscalls; ++i) {
79 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
80 evsels[i] = perf_evsel__newtp("syscalls", name);
81 if (IS_ERR(evsels[i])) {
82 pr_debug("perf_evsel__new(%s)\n", name);
83 goto out_delete_evlist;
86 evsels[i]->core.attr.wakeup_events = 1;
87 perf_evsel__set_sample_id(evsels[i], false);
89 evlist__add(evlist, evsels[i]);
91 if (evsel__open(evsels[i], cpus, threads) < 0) {
92 pr_debug("failed to open counter: %s, "
93 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
94 str_error_r(errno, sbuf, sizeof(sbuf)));
95 goto out_delete_evlist;
99 expected_nr_events[i] = 1 + rand() % 127;
102 if (perf_evlist__mmap(evlist, 128) < 0) {
103 pr_debug("failed to mmap events: %d (%s)\n", errno,
104 str_error_r(errno, sbuf, sizeof(sbuf)));
105 goto out_delete_evlist;
108 for (i = 0; i < nsyscalls; ++i)
109 for (j = 0; j < expected_nr_events[i]; ++j) {
110 int foo = syscalls[i]();
114 md = &evlist->mmap[0];
115 if (perf_mmap__read_init(md) < 0)
118 while ((event = perf_mmap__read_event(md)) != NULL) {
119 struct perf_sample sample;
121 if (event->header.type != PERF_RECORD_SAMPLE) {
122 pr_debug("unexpected %s event\n",
123 perf_event__name(event->header.type));
124 goto out_delete_evlist;
127 err = perf_evlist__parse_sample(evlist, event, &sample);
129 pr_err("Can't parse sample, err = %d\n", err);
130 goto out_delete_evlist;
134 evsel = perf_evlist__id2evsel(evlist, sample.id);
136 pr_debug("event with id %" PRIu64
137 " doesn't map to an evsel\n", sample.id);
138 goto out_delete_evlist;
140 nr_events[evsel->idx]++;
141 perf_mmap__consume(md);
143 perf_mmap__read_done(md);
147 evlist__for_each_entry(evlist, evsel) {
148 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
149 pr_debug("expected %d %s events, got %d\n",
150 expected_nr_events[evsel->idx],
151 perf_evsel__name(evsel), nr_events[evsel->idx]);
153 goto out_delete_evlist;
158 evlist__delete(evlist);
162 perf_cpu_map__put(cpus);
164 perf_thread_map__put(threads);