156 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 17static int exited;18static int nr_exit;19 20static 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, since27 * we asked by setting its exec_error to this handler.28 */29static 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 checks39 * if the number of exit event reported by the kernel is 1 or not40 * in order to check the kernel returns correct number of event.41 */42static 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_dummy();62 if (evlist == NULL) {63 pr_debug("evlist__new_dummy\n");64 return -1;65 }66 67 /*68 * Create maps of threads and cpus to monitor. In this case69 * we start with all threads and cpus (-1, -1) but then in70 * evlist__prepare_workload we'll fill in the only thread71 * we're monitoring, the one forked there.72 */73 cpus = perf_cpu_map__new_any_cpu();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#else94 evsel->core.attr.sample_freq = 1;95#endif96 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 117retry: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 130out_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 148out_delete_evlist:149 perf_cpu_map__put(cpus);150 perf_thread_map__put(threads);151 evlist__delete(evlist);152 return err;153}154 155DEFINE_SUITE("Number of exit events of a simple workload", task_exit);156