| // SPDX-License-Identifier: GPL-2.0 |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| #include <sys/mman.h> |
| #include <linux/string.h> |
| |
| #include "tests.h" |
| #include "util/debug.h" |
| #include "util/evsel.h" |
| #include "util/evlist.h" |
| #include "util/cpumap.h" |
| #include "util/mmap.h" |
| #include "util/thread_map.h" |
| #include <perf/evlist.h> |
| |
| #define NR_LOOPS 10000000 |
| |
| /* |
| * This test will open software clock events (cpu-clock, task-clock) |
| * then check their frequency -> period conversion has no artifact of |
| * setting period to 1 forcefully. |
| */ |
| static int __test__sw_clock_freq(enum perf_sw_ids clock_id) |
| { |
| int i, err = -1; |
| volatile int tmp = 0; |
| u64 total_periods = 0; |
| int nr_samples = 0; |
| char sbuf[STRERR_BUFSIZE]; |
| union perf_event *event; |
| struct evsel *evsel; |
| struct evlist *evlist; |
| struct perf_event_attr attr = { |
| .type = PERF_TYPE_SOFTWARE, |
| .config = clock_id, |
| .sample_type = PERF_SAMPLE_PERIOD, |
| .exclude_kernel = 1, |
| .disabled = 1, |
| .freq = 1, |
| }; |
| struct perf_cpu_map *cpus; |
| struct perf_thread_map *threads; |
| struct mmap *md; |
| |
| attr.sample_freq = 500; |
| |
| evlist = evlist__new(); |
| if (evlist == NULL) { |
| pr_debug("evlist__new\n"); |
| return -1; |
| } |
| |
| evsel = evsel__new(&attr); |
| if (evsel == NULL) { |
| pr_debug("perf_evsel__new\n"); |
| goto out_delete_evlist; |
| } |
| evlist__add(evlist, evsel); |
| |
| cpus = perf_cpu_map__dummy_new(); |
| threads = thread_map__new_by_tid(getpid()); |
| if (!cpus || !threads) { |
| err = -ENOMEM; |
| pr_debug("Not enough memory to create thread/cpu maps\n"); |
| goto out_free_maps; |
| } |
| |
| perf_evlist__set_maps(&evlist->core, cpus, threads); |
| |
| cpus = NULL; |
| threads = NULL; |
| |
| if (evlist__open(evlist)) { |
| const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; |
| |
| err = -errno; |
| pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", |
| str_error_r(errno, sbuf, sizeof(sbuf)), |
| knob, (u64)attr.sample_freq); |
| goto out_delete_evlist; |
| } |
| |
| err = evlist__mmap(evlist, 128); |
| if (err < 0) { |
| pr_debug("failed to mmap event: %d (%s)\n", errno, |
| str_error_r(errno, sbuf, sizeof(sbuf))); |
| goto out_delete_evlist; |
| } |
| |
| evlist__enable(evlist); |
| |
| /* collect samples */ |
| for (i = 0; i < NR_LOOPS; i++) |
| tmp++; |
| |
| evlist__disable(evlist); |
| |
| 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) |
| goto next_event; |
| |
| err = perf_evlist__parse_sample(evlist, event, &sample); |
| if (err < 0) { |
| pr_debug("Error during parse sample\n"); |
| goto out_delete_evlist; |
| } |
| |
| total_periods += sample.period; |
| nr_samples++; |
| next_event: |
| perf_mmap__consume(md); |
| } |
| perf_mmap__read_done(md); |
| |
| out_init: |
| if ((u64) nr_samples == total_periods) { |
| pr_debug("All (%d) samples have period value of 1!\n", |
| nr_samples); |
| err = -1; |
| } |
| |
| out_free_maps: |
| perf_cpu_map__put(cpus); |
| perf_thread_map__put(threads); |
| out_delete_evlist: |
| evlist__delete(evlist); |
| return err; |
| } |
| |
| int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) |
| { |
| int ret; |
| |
| ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); |
| if (!ret) |
| ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); |
| |
| return ret; |
| } |