126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <inttypes.h>
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/* For the CPU_* macros */
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#include <pthread.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <api/fs/fs.h>
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#include <linux/err.h>
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#include <api/fs/tracing_path.h>
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#include "evsel.h"
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#include "tests.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "debug.h"
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#include "stat.h"
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int test__openat_syscall_event_on_all_cpus(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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int err = -1, fd, cpu;
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struct cpu_map *cpus;
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struct perf_evsel *evsel;
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unsigned int nr_openat_calls = 111, i;
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cpu_set_t cpu_set;
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struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
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char sbuf[STRERR_BUFSIZE];
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char errbuf[BUFSIZ];
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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cpus = cpu_map__new(NULL);
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if (cpus == NULL) {
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pr_debug("cpu_map__new\n");
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goto out_thread_map_delete;
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}
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CPU_ZERO(&cpu_set);
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evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
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if (IS_ERR(evsel)) {
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tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
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pr_debug("%s\n", errbuf);
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goto out_thread_map_delete;
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}
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if (perf_evsel__open(evsel, cpus, threads) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_evsel_delete;
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}
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int ncalls = nr_openat_calls + cpu;
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/*
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* XXX eventually lift this restriction in a way that
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* keeps perf building on older glibc installations
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* without CPU_ALLOC. 1024 cpus in 2010 still seems
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* a reasonable upper limit tho :-)
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*/
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if (cpus->map[cpu] >= CPU_SETSIZE) {
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pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
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continue;
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}
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CPU_SET(cpus->map[cpu], &cpu_set);
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
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pr_debug("sched_setaffinity() failed on CPU %d: %s ",
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cpus->map[cpu],
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_close_fd;
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}
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for (i = 0; i < ncalls; ++i) {
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fd = openat(0, "/etc/passwd", O_RDONLY);
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close(fd);
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}
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CPU_CLR(cpus->map[cpu], &cpu_set);
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}
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/*
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* Here we need to explicitly preallocate the counts, as if
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* we use the auto allocation it will allocate just for 1 cpu,
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* as we start by cpu 0.
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*/
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if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
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pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
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goto out_close_fd;
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}
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err = 0;
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int expected;
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if (cpus->map[cpu] >= CPU_SETSIZE)
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continue;
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if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
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pr_debug("perf_evsel__read_on_cpu\n");
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err = -1;
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break;
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}
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expected = nr_openat_calls + cpu;
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if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
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pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
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expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
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err = -1;
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}
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}
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perf_evsel__free_counts(evsel);
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out_close_fd:
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perf_evsel__close_fd(evsel);
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out_evsel_delete:
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perf_evsel__delete(evsel);
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out_thread_map_delete:
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thread_map__put(threads);
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return err;
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}
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