perf test: Add test case for checking number of EXIT events
[linux-3.10.git] / tools / perf / tests / task-exit.c
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
9 static int exited;
10 static int nr_exit;
11
12 static 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  */
25 int 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
97 retry:
98         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
99                 if (event->header.type != PERF_RECORD_EXIT)
100                         continue;
101
102                 nr_exit++;
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);
116 out_close_evlist:
117         perf_evlist__close(evlist);
118 out_delete_maps:
119         perf_evlist__delete_maps(evlist);
120 out_free_evlist:
121         perf_evlist__delete(evlist);
122         return err;
123 }