summaryrefslogtreecommitdiffstats
path: root/tools/perf/tests/task-exit.c
blob: add16385f13e5bbb750cec83da3f1fe0d28889af (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
#include "cpumap.h"
#include "tests.h"

#include <signal.h>

static int exited;
static int nr_exit;

static void sig_handler(int sig __maybe_unused)
{
	exited = 1;
}

/*
 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
 * we asked by setting its exec_error to this handler.
 */
static void workload_exec_failed_signal(int signo __maybe_unused,
					siginfo_t *info __maybe_unused,
					void *ucontext __maybe_unused)
{
	exited	= 1;
	nr_exit = -1;
}

/*
 * This test will start a workload that does nothing then it checks
 * if the number of exit event reported by the kernel is 1 or not
 * in order to check the kernel returns correct number of event.
 */
int test__task_exit(void)
{
	int err = -1;
	union perf_event *event;
	struct perf_evsel *evsel;
	struct perf_evlist *evlist;
	struct target target = {
		.uid		= UINT_MAX,
		.uses_mmap	= true,
	};
	const char *argv[] = { "true", NULL };
	char sbuf[STRERR_BUFSIZE];
	struct cpu_map *cpus;
	struct thread_map *threads;

	signal(SIGCHLD, sig_handler);

	evlist = perf_evlist__new_default();
	if (evlist == NULL) {
		pr_debug("perf_evlist__new_default\n");
		return -1;
	}

	/*
	 * Create maps of threads and cpus to monitor. In this case
	 * we start with all threads and cpus (-1, -1) but then in
	 * perf_evlist__prepare_workload we'll fill in the only thread
	 * we're monitoring, the one forked there.
	 */
	cpus = cpu_map__dummy_new();
	threads = thread_map__new_by_tid(-1);
	if (!cpus || !threads) {
		err = -ENOMEM;
		pr_debug("Not enough memory to create thread/cpu maps\n");
		goto out_free_maps;
	}

	perf_evlist__set_maps(evlist, cpus, threads);

	cpus	= NULL;
	threads = NULL;

	err = perf_evlist__prepare_workload(evlist, &target, argv, false,
					    workload_exec_failed_signal);
	if (err < 0) {
		pr_debug("Couldn't run the workload!\n");
		goto out_delete_evlist;
	}

	evsel = perf_evlist__first(evlist);
	evsel->attr.task = 1;
	evsel->attr.sample_freq = 0;
	evsel->attr.inherit = 0;
	evsel->attr.watermark = 0;
	evsel->attr.wakeup_events = 1;
	evsel->attr.exclude_kernel = 1;

	err = perf_evlist__open(evlist);
	if (err < 0) {
		pr_debug("Couldn't open the evlist: %s\n",
			 strerror_r(-err, sbuf, sizeof(sbuf)));
		goto out_delete_evlist;
	}

	if (perf_evlist__mmap(evlist, 128, true) < 0) {
		pr_debug("failed to mmap events: %d (%s)\n", errno,
			 strerror_r(errno, sbuf, sizeof(sbuf)));
		goto out_delete_evlist;
	}

	perf_evlist__start_workload(evlist);

retry:
	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
		if (event->header.type == PERF_RECORD_EXIT)
			nr_exit++;

		perf_evlist__mmap_consume(evlist, 0);
	}

	if (!exited || !nr_exit) {
		perf_evlist__poll(evlist, -1);
		goto retry;
	}

	if (nr_exit != 1) {
		pr_debug("received %d EXIT records\n", nr_exit);
		err = -1;
	}

out_free_maps:
	cpu_map__put(cpus);
	thread_map__put(threads);
out_delete_evlist:
	perf_evlist__delete(evlist);
	return err;
}
OpenPOWER on IntegriCloud