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
sig_handler(int sig)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 */
test__task_exit(void)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 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);
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 }
124