GNU Linux-libre 4.19.211-gnu1
[releases.git] / tools / perf / tests / task-exit.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include "evlist.h"
3 #include "evsel.h"
4 #include "thread_map.h"
5 #include "cpumap.h"
6 #include "tests.h"
7
8 #include <errno.h>
9 #include <signal.h>
10
11 static int exited;
12 static int nr_exit;
13
14 static void sig_handler(int sig __maybe_unused)
15 {
16         exited = 1;
17 }
18
19 /*
20  * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
21  * we asked by setting its exec_error to this handler.
22  */
23 static void workload_exec_failed_signal(int signo __maybe_unused,
24                                         siginfo_t *info __maybe_unused,
25                                         void *ucontext __maybe_unused)
26 {
27         exited  = 1;
28         nr_exit = -1;
29 }
30
31 /*
32  * This test will start a workload that does nothing then it checks
33  * if the number of exit event reported by the kernel is 1 or not
34  * in order to check the kernel returns correct number of event.
35  */
36 int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused)
37 {
38         int err = -1;
39         union perf_event *event;
40         struct perf_evsel *evsel;
41         struct perf_evlist *evlist;
42         struct target target = {
43                 .uid            = UINT_MAX,
44                 .uses_mmap      = true,
45         };
46         const char *argv[] = { "true", NULL };
47         char sbuf[STRERR_BUFSIZE];
48         struct cpu_map *cpus;
49         struct thread_map *threads;
50         struct perf_mmap *md;
51
52         signal(SIGCHLD, sig_handler);
53
54         evlist = perf_evlist__new_default();
55         if (evlist == NULL) {
56                 pr_debug("perf_evlist__new_default\n");
57                 return -1;
58         }
59
60         /*
61          * Create maps of threads and cpus to monitor. In this case
62          * we start with all threads and cpus (-1, -1) but then in
63          * perf_evlist__prepare_workload we'll fill in the only thread
64          * we're monitoring, the one forked there.
65          */
66         cpus = cpu_map__dummy_new();
67         threads = thread_map__new_by_tid(-1);
68         if (!cpus || !threads) {
69                 err = -ENOMEM;
70                 pr_debug("Not enough memory to create thread/cpu maps\n");
71                 goto out_free_maps;
72         }
73
74         perf_evlist__set_maps(evlist, cpus, threads);
75
76         cpus    = NULL;
77         threads = NULL;
78
79         err = perf_evlist__prepare_workload(evlist, &target, argv, false,
80                                             workload_exec_failed_signal);
81         if (err < 0) {
82                 pr_debug("Couldn't run the workload!\n");
83                 goto out_delete_evlist;
84         }
85
86         evsel = perf_evlist__first(evlist);
87         evsel->attr.task = 1;
88 #ifdef __s390x__
89         evsel->attr.sample_freq = 1000000;
90 #else
91         evsel->attr.sample_freq = 1;
92 #endif
93         evsel->attr.inherit = 0;
94         evsel->attr.watermark = 0;
95         evsel->attr.wakeup_events = 1;
96         evsel->attr.exclude_kernel = 1;
97
98         err = perf_evlist__open(evlist);
99         if (err < 0) {
100                 pr_debug("Couldn't open the evlist: %s\n",
101                          str_error_r(-err, sbuf, sizeof(sbuf)));
102                 goto out_delete_evlist;
103         }
104
105         if (perf_evlist__mmap(evlist, 128) < 0) {
106                 pr_debug("failed to mmap events: %d (%s)\n", errno,
107                          str_error_r(errno, sbuf, sizeof(sbuf)));
108                 err = -1;
109                 goto out_delete_evlist;
110         }
111
112         perf_evlist__start_workload(evlist);
113
114 retry:
115         md = &evlist->mmap[0];
116         if (perf_mmap__read_init(md) < 0)
117                 goto out_init;
118
119         while ((event = perf_mmap__read_event(md)) != NULL) {
120                 if (event->header.type == PERF_RECORD_EXIT)
121                         nr_exit++;
122
123                 perf_mmap__consume(md);
124         }
125         perf_mmap__read_done(md);
126
127 out_init:
128         if (!exited || !nr_exit) {
129                 perf_evlist__poll(evlist, -1);
130                 goto retry;
131         }
132
133         if (nr_exit != 1) {
134                 pr_debug("received %d EXIT records\n", nr_exit);
135                 err = -1;
136         }
137
138 out_free_maps:
139         cpu_map__put(cpus);
140         thread_map__put(threads);
141 out_delete_evlist:
142         perf_evlist__delete(evlist);
143         return err;
144 }