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Linux/tools/perf/tests/task-exit.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include "debug.h"
  3 #include "evlist.h"
  4 #include "evsel.h"
  5 #include "target.h"
  6 #include "thread_map.h"
  7 #include "tests.h"
  8 #include "util/mmap.h"
  9 
 10 #include <errno.h>
 11 #include <signal.h>
 12 #include <linux/string.h>
 13 #include <perf/cpumap.h>
 14 #include <perf/evlist.h>
 15 #include <perf/mmap.h>
 16 
 17 static int exited;
 18 static int nr_exit;
 19 
 20 static void sig_handler(int sig __maybe_unused)
 21 {
 22         exited = 1;
 23 }
 24 
 25 /*
 26  * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
 27  * we asked by setting its exec_error to this handler.
 28  */
 29 static void workload_exec_failed_signal(int signo __maybe_unused,
 30                                         siginfo_t *info __maybe_unused,
 31                                         void *ucontext __maybe_unused)
 32 {
 33         exited  = 1;
 34         nr_exit = -1;
 35 }
 36 
 37 /*
 38  * This test will start a workload that does nothing then it checks
 39  * if the number of exit event reported by the kernel is 1 or not
 40  * in order to check the kernel returns correct number of event.
 41  */
 42 static int test__task_exit(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 43 {
 44         int err = -1;
 45         union perf_event *event;
 46         struct evsel *evsel;
 47         struct evlist *evlist;
 48         struct target target = {
 49                 .uid            = UINT_MAX,
 50                 .uses_mmap      = true,
 51         };
 52         const char *argv[] = { "true", NULL };
 53         char sbuf[STRERR_BUFSIZE];
 54         struct perf_cpu_map *cpus;
 55         struct perf_thread_map *threads;
 56         struct mmap *md;
 57         int retry_count = 0;
 58 
 59         signal(SIGCHLD, sig_handler);
 60 
 61         evlist = evlist__new_default();
 62         if (evlist == NULL) {
 63                 pr_debug("evlist__new_default\n");
 64                 return -1;
 65         }
 66 
 67         /*
 68          * Create maps of threads and cpus to monitor. In this case
 69          * we start with all threads and cpus (-1, -1) but then in
 70          * evlist__prepare_workload we'll fill in the only thread
 71          * we're monitoring, the one forked there.
 72          */
 73         cpus = perf_cpu_map__dummy_new();
 74         threads = thread_map__new_by_tid(-1);
 75         if (!cpus || !threads) {
 76                 err = -ENOMEM;
 77                 pr_debug("Not enough memory to create thread/cpu maps\n");
 78                 goto out_delete_evlist;
 79         }
 80 
 81         perf_evlist__set_maps(&evlist->core, cpus, threads);
 82 
 83         err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal);
 84         if (err < 0) {
 85                 pr_debug("Couldn't run the workload!\n");
 86                 goto out_delete_evlist;
 87         }
 88 
 89         evsel = evlist__first(evlist);
 90         evsel->core.attr.task = 1;
 91 #ifdef __s390x__
 92         evsel->core.attr.sample_freq = 1000000;
 93 #else
 94         evsel->core.attr.sample_freq = 1;
 95 #endif
 96         evsel->core.attr.inherit = 0;
 97         evsel->core.attr.watermark = 0;
 98         evsel->core.attr.wakeup_events = 1;
 99         evsel->core.attr.exclude_kernel = 1;
100 
101         err = evlist__open(evlist);
102         if (err < 0) {
103                 pr_debug("Couldn't open the evlist: %s\n",
104                          str_error_r(-err, sbuf, sizeof(sbuf)));
105                 goto out_delete_evlist;
106         }
107 
108         if (evlist__mmap(evlist, 128) < 0) {
109                 pr_debug("failed to mmap events: %d (%s)\n", errno,
110                          str_error_r(errno, sbuf, sizeof(sbuf)));
111                 err = -1;
112                 goto out_delete_evlist;
113         }
114 
115         evlist__start_workload(evlist);
116 
117 retry:
118         md = &evlist->mmap[0];
119         if (perf_mmap__read_init(&md->core) < 0)
120                 goto out_init;
121 
122         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
123                 if (event->header.type == PERF_RECORD_EXIT)
124                         nr_exit++;
125 
126                 perf_mmap__consume(&md->core);
127         }
128         perf_mmap__read_done(&md->core);
129 
130 out_init:
131         if (!exited || !nr_exit) {
132                 evlist__poll(evlist, -1);
133 
134                 if (retry_count++ > 1000) {
135                         pr_debug("Failed after retrying 1000 times\n");
136                         err = -1;
137                         goto out_delete_evlist;
138                 }
139 
140                 goto retry;
141         }
142 
143         if (nr_exit != 1) {
144                 pr_debug("received %d EXIT records\n", nr_exit);
145                 err = -1;
146         }
147 
148 out_delete_evlist:
149         perf_cpu_map__put(cpus);
150         perf_thread_map__put(threads);
151         evlist__delete(evlist);
152         return err;
153 }
154 
155 DEFINE_SUITE("Number of exit events of a simple workload", task_exit);
156 

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