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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162// SPDX-License-Identifier: GPL-2.0#include "debug.h"#include "evlist.h"#include "evsel.h"#include "target.h"#include "thread_map.h"#include "tests.h"#include "util/mmap.h"
#include <errno.h>#include <signal.h>#include <linux/string.h>#include <perf/cpumap.h>#include <perf/evlist.h>#include <perf/mmap.h>
static int exited;static int nr_exit;
static void sig_handler(int sig __maybe_unused){ exited = 1;}
/* * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since * we asked by setting its exec_error to this handler. */static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info __maybe_unused, void *ucontext __maybe_unused){ exited = 1; nr_exit = -1;}
/* * This test will start a workload that does nothing then it checks * if the number of exit event reported by the kernel is 1 or not * in order to check the kernel returns correct number of event. */static int test__task_exit(struct test_suite *test __maybe_unused, int subtest __maybe_unused){ int err = -1; union perf_event *event; struct evsel *evsel; struct evlist *evlist; struct target target = { .uses_mmap = true, }; const char *argv[] = { "true", NULL }; char sbuf[STRERR_BUFSIZE]; struct perf_cpu_map *cpus; struct perf_thread_map *threads; struct mmap *md; int retry_count = 0;
signal(SIGCHLD, sig_handler);
evlist = evlist__new_dummy(); if (evlist == NULL) { pr_debug("evlist__new_dummy\n"); return -1; }
/* * Create maps of threads and cpus to monitor. In this case * we start with all threads and cpus (-1, -1) but then in * evlist__prepare_workload we'll fill in the only thread * we're monitoring, the one forked there. */ cpus = perf_cpu_map__new_any_cpu(); threads = thread_map__new_by_tid(-1); if (!cpus || !threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_put_evlist; }
perf_evlist__set_maps(evlist__core(evlist), cpus, threads);
err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal); if (err < 0) { pr_debug("Couldn't run the workload!\n"); goto out_put_evlist; }
evsel = evlist__first(evlist); evsel->core.attr.task = 1;#ifdef __s390x__ evsel->core.attr.sample_freq = 1000000;#else evsel->core.attr.sample_freq = 1;#endif evsel->core.attr.inherit = 0; evsel->core.attr.watermark = 0; evsel->core.attr.wakeup_events = 1; evsel->core.attr.exclude_kernel = 1;
err = evlist__open(evlist); if (err < 0) { pr_debug("Couldn't open the evlist: %s\n", str_error_r(-err, sbuf, sizeof(sbuf))); goto out_put_evlist; }
if (evlist__do_mmap(evlist, 128) < 0) { pr_debug("failed to mmap events: %d (%s)\n", errno, str_error_r(errno, sbuf, sizeof(sbuf))); err = -1; goto out_put_evlist; }
evlist__start_workload(evlist);
retry: md = &evlist__mmap(evlist)[0]; if (perf_mmap__read_init(&md->core) < 0) goto out_init;
while ((event = perf_mmap__read_event(&md->core)) != NULL) { if (event->header.type == PERF_RECORD_EXIT) nr_exit++;
perf_mmap__consume(&md->core); } perf_mmap__read_done(&md->core);
out_init: if (!exited || !nr_exit) { evlist__poll(evlist, -1);
if (retry_count++ > 1000) { pr_debug("Failed after retrying 1000 times\n"); err = -1; goto out_put_evlist; }
goto retry; }
if (nr_exit != 1) { pr_debug("received %d EXIT records\n", nr_exit); err = -1; }
out_put_evlist: perf_cpu_map__put(cpus); perf_thread_map__put(threads); evlist__put(evlist); return err;}
struct test_case tests__task_exit[] = { TEST_CASE_EXCLUSIVE("Number of exit events of a simple workload", task_exit), { .name = NULL, }};struct test_suite suite__task_exit = { .desc = "Number of exit events of a simple workload", .test_cases = tests__task_exit,};