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 __maybe_unused)12 static void sig_handler(int sig __maybe_unused)
13 {
14 exited = 1;
15 }
16
17 /*
18 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
19 * we asked by setting its exec_error to this handler.
20 */
workload_exec_failed_signal(int signo __maybe_unused,siginfo_t * info __maybe_unused,void * ucontext __maybe_unused)21 static void workload_exec_failed_signal(int signo __maybe_unused,
22 siginfo_t *info __maybe_unused,
23 void *ucontext __maybe_unused)
24 {
25 exited = 1;
26 nr_exit = -1;
27 }
28
29 /*
30 * This test will start a workload that does nothing then it checks
31 * if the number of exit event reported by the kernel is 1 or not
32 * in order to check the kernel returns correct number of event.
33 */
test__task_exit(void)34 int test__task_exit(void)
35 {
36 int err = -1;
37 union perf_event *event;
38 struct perf_evsel *evsel;
39 struct perf_evlist *evlist;
40 struct target target = {
41 .uid = UINT_MAX,
42 .uses_mmap = true,
43 };
44 const char *argv[] = { "true", NULL };
45 char sbuf[STRERR_BUFSIZE];
46 struct cpu_map *cpus;
47 struct thread_map *threads;
48
49 signal(SIGCHLD, sig_handler);
50
51 evlist = perf_evlist__new_default();
52 if (evlist == NULL) {
53 pr_debug("perf_evlist__new_default\n");
54 return -1;
55 }
56
57 /*
58 * Create maps of threads and cpus to monitor. In this case
59 * we start with all threads and cpus (-1, -1) but then in
60 * perf_evlist__prepare_workload we'll fill in the only thread
61 * we're monitoring, the one forked there.
62 */
63 cpus = cpu_map__dummy_new();
64 threads = thread_map__new_by_tid(-1);
65 if (!cpus || !threads) {
66 err = -ENOMEM;
67 pr_debug("Not enough memory to create thread/cpu maps\n");
68 goto out_free_maps;
69 }
70
71 perf_evlist__set_maps(evlist, cpus, threads);
72
73 cpus = NULL;
74 threads = NULL;
75
76 err = perf_evlist__prepare_workload(evlist, &target, argv, false,
77 workload_exec_failed_signal);
78 if (err < 0) {
79 pr_debug("Couldn't run the workload!\n");
80 goto out_delete_evlist;
81 }
82
83 evsel = perf_evlist__first(evlist);
84 evsel->attr.task = 1;
85 evsel->attr.sample_freq = 0;
86 evsel->attr.inherit = 0;
87 evsel->attr.watermark = 0;
88 evsel->attr.wakeup_events = 1;
89 evsel->attr.exclude_kernel = 1;
90
91 err = perf_evlist__open(evlist);
92 if (err < 0) {
93 pr_debug("Couldn't open the evlist: %s\n",
94 strerror_r(-err, sbuf, sizeof(sbuf)));
95 goto out_delete_evlist;
96 }
97
98 if (perf_evlist__mmap(evlist, 128, true) < 0) {
99 pr_debug("failed to mmap events: %d (%s)\n", errno,
100 strerror_r(errno, sbuf, sizeof(sbuf)));
101 goto out_delete_evlist;
102 }
103
104 perf_evlist__start_workload(evlist);
105
106 retry:
107 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
108 if (event->header.type == PERF_RECORD_EXIT)
109 nr_exit++;
110
111 perf_evlist__mmap_consume(evlist, 0);
112 }
113
114 if (!exited || !nr_exit) {
115 perf_evlist__poll(evlist, -1);
116 goto retry;
117 }
118
119 if (nr_exit != 1) {
120 pr_debug("received %d EXIT records\n", nr_exit);
121 err = -1;
122 }
123
124 out_free_maps:
125 cpu_map__put(cpus);
126 thread_map__put(threads);
127 out_delete_evlist:
128 perf_evlist__delete(evlist);
129 return err;
130 }
131