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