1#include "evlist.h"
2#include "evsel.h"
3#include "thread_map.h"
4#include "cpumap.h"
5#include "tests.h"
6
7#include <signal.h>
8
9static int exited;
10static int nr_exit;
11
12static void sig_handler(int sig)
13{
14	exited = 1;
15
16	if (sig == SIGUSR1)
17		nr_exit = -1;
18}
19
20/*
21 * This test will start a workload that does nothing then it checks
22 * if the number of exit event reported by the kernel is 1 or not
23 * in order to check the kernel returns correct number of event.
24 */
25int test__task_exit(void)
26{
27	int err = -1;
28	union perf_event *event;
29	struct perf_evsel *evsel;
30	struct perf_evlist *evlist;
31	struct perf_target target = {
32		.uid		= UINT_MAX,
33		.uses_mmap	= true,
34	};
35	const char *argv[] = { "true", NULL };
36
37	signal(SIGCHLD, sig_handler);
38	signal(SIGUSR1, sig_handler);
39
40	evlist = perf_evlist__new();
41	if (evlist == NULL) {
42		pr_debug("perf_evlist__new\n");
43		return -1;
44	}
45	/*
46	 * We need at least one evsel in the evlist, use the default
47	 * one: "cycles".
48	 */
49	err = perf_evlist__add_default(evlist);
50	if (err < 0) {
51		pr_debug("Not enough memory to create evsel\n");
52		goto out_free_evlist;
53	}
54
55	/*
56	 * Create maps of threads and cpus to monitor. In this case
57	 * we start with all threads and cpus (-1, -1) but then in
58	 * perf_evlist__prepare_workload we'll fill in the only thread
59	 * we're monitoring, the one forked there.
60	 */
61	evlist->cpus = cpu_map__dummy_new();
62	evlist->threads = thread_map__new_by_tid(-1);
63	if (!evlist->cpus || !evlist->threads) {
64		err = -ENOMEM;
65		pr_debug("Not enough memory to create thread/cpu maps\n");
66		goto out_delete_maps;
67	}
68
69	err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
70	if (err < 0) {
71		pr_debug("Couldn't run the workload!\n");
72		goto out_delete_maps;
73	}
74
75	evsel = perf_evlist__first(evlist);
76	evsel->attr.task = 1;
77	evsel->attr.sample_freq = 0;
78	evsel->attr.inherit = 0;
79	evsel->attr.watermark = 0;
80	evsel->attr.wakeup_events = 1;
81	evsel->attr.exclude_kernel = 1;
82
83	err = perf_evlist__open(evlist);
84	if (err < 0) {
85		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
86		goto out_delete_maps;
87	}
88
89	if (perf_evlist__mmap(evlist, 128, true) < 0) {
90		pr_debug("failed to mmap events: %d (%s)\n", errno,
91			 strerror(errno));
92		goto out_close_evlist;
93	}
94
95	perf_evlist__start_workload(evlist);
96
97retry:
98	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
99		if (event->header.type == PERF_RECORD_EXIT)
100			nr_exit++;
101
102		perf_evlist__mmap_consume(evlist, 0);
103	}
104
105	if (!exited || !nr_exit) {
106		poll(evlist->pollfd, evlist->nr_fds, -1);
107		goto retry;
108	}
109
110	if (nr_exit != 1) {
111		pr_debug("received %d EXIT records\n", nr_exit);
112		err = -1;
113	}
114
115	perf_evlist__munmap(evlist);
116out_close_evlist:
117	perf_evlist__close(evlist);
118out_delete_maps:
119	perf_evlist__delete_maps(evlist);
120out_free_evlist:
121	perf_evlist__delete(evlist);
122	return err;
123}
124