124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tests.h"
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#include <signal.h>
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static int exited;
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static int nr_exit;
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static void sig_handler(int sig)
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{
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exited = 1;
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if (sig == SIGUSR1)
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nr_exit = -1;
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}
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/*
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* This test will start a workload that does nothing then it checks
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* if the number of exit event reported by the kernel is 1 or not
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* in order to check the kernel returns correct number of event.
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*/
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int test__task_exit(void)
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{
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int err = -1;
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union perf_event *event;
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struct perf_evsel *evsel;
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struct perf_evlist *evlist;
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struct perf_target target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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};
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const char *argv[] = { "true", NULL };
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signal(SIGCHLD, sig_handler);
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signal(SIGUSR1, sig_handler);
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evlist = perf_evlist__new();
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if (evlist == NULL) {
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pr_debug("perf_evlist__new\n");
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return -1;
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}
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/*
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* We need at least one evsel in the evlist, use the default
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* one: "cycles".
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*/
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err = perf_evlist__add_default(evlist);
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if (err < 0) {
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pr_debug("Not enough memory to create evsel\n");
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goto out_free_evlist;
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}
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/*
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* Create maps of threads and cpus to monitor. In this case
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* we start with all threads and cpus (-1, -1) but then in
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* perf_evlist__prepare_workload we'll fill in the only thread
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* we're monitoring, the one forked there.
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*/
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evlist->cpus = cpu_map__dummy_new();
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evlist->threads = thread_map__new_by_tid(-1);
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if (!evlist->cpus || !evlist->threads) {
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err = -ENOMEM;
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_delete_maps;
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}
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err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
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if (err < 0) {
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pr_debug("Couldn't run the workload!\n");
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goto out_delete_maps;
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}
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evsel = perf_evlist__first(evlist);
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evsel->attr.task = 1;
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evsel->attr.sample_freq = 0;
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evsel->attr.inherit = 0;
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evsel->attr.watermark = 0;
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evsel->attr.wakeup_events = 1;
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evsel->attr.exclude_kernel = 1;
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
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goto out_delete_maps;
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}
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if (perf_evlist__mmap(evlist, 128, true) < 0) {
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pr_debug("failed to mmap events: %d (%s)\n", errno,
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strerror(errno));
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goto out_close_evlist;
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}
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perf_evlist__start_workload(evlist);
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retry:
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while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
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if (event->header.type != PERF_RECORD_EXIT)
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continue;
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nr_exit++;
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}
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if (!exited || !nr_exit) {
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poll(evlist->pollfd, evlist->nr_fds, -1);
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goto retry;
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}
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if (nr_exit != 1) {
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pr_debug("received %d EXIT records\n", nr_exit);
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err = -1;
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}
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perf_evlist__munmap(evlist);
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out_close_evlist:
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perf_evlist__close(evlist);
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out_delete_maps:
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perf_evlist__delete_maps(evlist);
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out_free_evlist:
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perf_evlist__delete(evlist);
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return err;
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}
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