diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/tests/mmap-basic.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c new file mode 100644 index 000000000..0919b0793 --- /dev/null +++ b/tools/perf/tests/mmap-basic.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <errno.h> +#include <inttypes.h> +/* For the CLR_() macros */ +#include <pthread.h> + +#include "evlist.h" +#include "evsel.h" +#include "thread_map.h" +#include "cpumap.h" +#include "tests.h" +#include <linux/err.h> +#include <linux/kernel.h> + +/* + * This test will generate random numbers of calls to some getpid syscalls, + * then establish an mmap for a group of events that are created to monitor + * the syscalls. + * + * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated + * sample.id field to map back to its respective perf_evsel instance. + * + * Then it checks if the number of syscalls reported as perf events by + * the kernel corresponds to the number of syscalls made. + */ +int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused) +{ + int err = -1; + union perf_event *event; + struct thread_map *threads; + struct cpu_map *cpus; + struct perf_evlist *evlist; + cpu_set_t cpu_set; + const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; + pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; +#define nsyscalls ARRAY_SIZE(syscall_names) + unsigned int nr_events[nsyscalls], + expected_nr_events[nsyscalls], i, j; + struct perf_evsel *evsels[nsyscalls], *evsel; + char sbuf[STRERR_BUFSIZE]; + struct perf_mmap *md; + + threads = thread_map__new(-1, getpid(), UINT_MAX); + if (threads == NULL) { + pr_debug("thread_map__new\n"); + return -1; + } + + cpus = cpu_map__new(NULL); + if (cpus == NULL) { + pr_debug("cpu_map__new\n"); + goto out_free_threads; + } + + CPU_ZERO(&cpu_set); + CPU_SET(cpus->map[0], &cpu_set); + sched_setaffinity(0, sizeof(cpu_set), &cpu_set); + if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { + pr_debug("sched_setaffinity() failed on CPU %d: %s ", + cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_free_cpus; + } + + evlist = perf_evlist__new(); + if (evlist == NULL) { + pr_debug("perf_evlist__new\n"); + goto out_free_cpus; + } + + perf_evlist__set_maps(evlist, cpus, threads); + + for (i = 0; i < nsyscalls; ++i) { + char name[64]; + + snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); + evsels[i] = perf_evsel__newtp("syscalls", name); + if (IS_ERR(evsels[i])) { + pr_debug("perf_evsel__new(%s)\n", name); + goto out_delete_evlist; + } + + evsels[i]->attr.wakeup_events = 1; + perf_evsel__set_sample_id(evsels[i], false); + + perf_evlist__add(evlist, evsels[i]); + + if (perf_evsel__open(evsels[i], cpus, threads) < 0) { + pr_debug("failed to open counter: %s, " + "tweak /proc/sys/kernel/perf_event_paranoid?\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + nr_events[i] = 0; + expected_nr_events[i] = 1 + rand() % 127; + } + + if (perf_evlist__mmap(evlist, 128) < 0) { + pr_debug("failed to mmap events: %d (%s)\n", errno, + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + for (i = 0; i < nsyscalls; ++i) + for (j = 0; j < expected_nr_events[i]; ++j) { + int foo = syscalls[i](); + ++foo; + } + + md = &evlist->mmap[0]; + if (perf_mmap__read_init(md) < 0) + goto out_init; + + while ((event = perf_mmap__read_event(md)) != NULL) { + struct perf_sample sample; + + if (event->header.type != PERF_RECORD_SAMPLE) { + pr_debug("unexpected %s event\n", + perf_event__name(event->header.type)); + goto out_delete_evlist; + } + + err = perf_evlist__parse_sample(evlist, event, &sample); + if (err) { + pr_err("Can't parse sample, err = %d\n", err); + goto out_delete_evlist; + } + + err = -1; + evsel = perf_evlist__id2evsel(evlist, sample.id); + if (evsel == NULL) { + pr_debug("event with id %" PRIu64 + " doesn't map to an evsel\n", sample.id); + goto out_delete_evlist; + } + nr_events[evsel->idx]++; + perf_mmap__consume(md); + } + perf_mmap__read_done(md); + +out_init: + err = 0; + evlist__for_each_entry(evlist, evsel) { + if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { + pr_debug("expected %d %s events, got %d\n", + expected_nr_events[evsel->idx], + perf_evsel__name(evsel), nr_events[evsel->idx]); + err = -1; + goto out_delete_evlist; + } + } + +out_delete_evlist: + perf_evlist__delete(evlist); + cpus = NULL; + threads = NULL; +out_free_cpus: + cpu_map__put(cpus); +out_free_threads: + thread_map__put(threads); + return err; +} |