[linux-2.6-block.git] / tools / perf / tests / sw-clock.c

// 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/sample.h"
#include "util/thread_map.h"
#include <perf/evlist.h>
#include <perf/mmap.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 = NULL;
	struct perf_thread_map *threads = NULL;
	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("evsel__new\n");
		goto out_delete_evlist;
	}
	evlist__add(evlist, evsel);

	cpus = perf_cpu_map__new_any_cpu();
	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_delete_evlist;
	}

	perf_evlist__set_maps(&evlist->core, cpus, threads);

	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->core) < 0)
		goto out_init;

	while ((event = perf_mmap__read_event(&md->core)) != NULL) {
		struct perf_sample sample;

		perf_sample__init(&sample, /*all=*/false);
		if (event->header.type != PERF_RECORD_SAMPLE)
			goto next_event;

		err = evlist__parse_sample(evlist, event, &sample);
		if (err < 0) {
			pr_debug("Error during parse sample\n");
			perf_sample__exit(&sample);
			goto out_delete_evlist;
		}

		total_periods += sample.period;
		nr_samples++;
next_event:
		perf_mmap__consume(&md->core);
		perf_sample__exit(&sample);
	}
	perf_mmap__read_done(&md->core);

out_init:
	if ((u64) nr_samples == total_periods) {
		pr_debug("All (%d) samples have period value of 1!\n",
			 nr_samples);
		err = -1;
	}

out_delete_evlist:
	perf_cpu_map__put(cpus);
	perf_thread_map__put(threads);
	evlist__delete(evlist);
	return err;
}

static int test__sw_clock_freq(struct test_suite *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;
}

DEFINE_SUITE("Software clock events period values", sw_clock_freq);
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <errno.h>
	3	#include <inttypes.h>
	4	#include <unistd.h>
	5	#include <stdlib.h>
	6	#include <signal.h>
	7	#include <sys/mman.h>
	8	#include <linux/string.h>
	9
	10	#include "tests.h"
	11	#include "util/debug.h"
	12	#include "util/evsel.h"
	13	#include "util/evlist.h"
	14	#include "util/cpumap.h"
	15	#include "util/mmap.h"
	16	#include "util/sample.h"
	17	#include "util/thread_map.h"
	18	#include <perf/evlist.h>
	19	#include <perf/mmap.h>
	20
	21	#define NR_LOOPS 10000000
	22
	23	/*
	24	* This test will open software clock events (cpu-clock, task-clock)
	25	* then check their frequency -> period conversion has no artifact of
	26	* setting period to 1 forcefully.
	27	*/
	28	static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
	29	{
	30	int i, err = -1;
	31	volatile int tmp = 0;
	32	u64 total_periods = 0;
	33	int nr_samples = 0;
	34	char sbuf[STRERR_BUFSIZE];
	35	union perf_event *event;
	36	struct evsel *evsel;
	37	struct evlist *evlist;
	38	struct perf_event_attr attr = {
	39	.type = PERF_TYPE_SOFTWARE,
	40	.config = clock_id,
	41	.sample_type = PERF_SAMPLE_PERIOD,
	42	.exclude_kernel = 1,
	43	.disabled = 1,
	44	.freq = 1,
	45	};
	46	struct perf_cpu_map *cpus = NULL;
	47	struct perf_thread_map *threads = NULL;
	48	struct mmap *md;
	49
	50	attr.sample_freq = 500;
	51
	52	evlist = evlist__new();
	53	if (evlist == NULL) {
	54	pr_debug("evlist__new\n");
	55	return -1;
	56	}
	57
	58	evsel = evsel__new(&attr);
	59	if (evsel == NULL) {
	60	pr_debug("evsel__new\n");
	61	goto out_delete_evlist;
	62	}
	63	evlist__add(evlist, evsel);
	64
	65	cpus = perf_cpu_map__new_any_cpu();
	66	threads = thread_map__new_by_tid(getpid());
	67	if (!cpus \|\| !threads) {
	68	err = -ENOMEM;
	69	pr_debug("Not enough memory to create thread/cpu maps\n");
	70	goto out_delete_evlist;
	71	}
	72
	73	perf_evlist__set_maps(&evlist->core, cpus, threads);
	74
	75	if (evlist__open(evlist)) {
	76	const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
	77
	78	err = -errno;
	79	pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
	80	str_error_r(errno, sbuf, sizeof(sbuf)),
	81	knob, (u64)attr.sample_freq);
	82	goto out_delete_evlist;
	83	}
	84
	85	err = evlist__mmap(evlist, 128);
	86	if (err < 0) {
	87	pr_debug("failed to mmap event: %d (%s)\n", errno,
	88	str_error_r(errno, sbuf, sizeof(sbuf)));
	89	goto out_delete_evlist;
	90	}
	91
	92	evlist__enable(evlist);
	93
	94	/* collect samples */
	95	for (i = 0; i < NR_LOOPS; i++)
	96	tmp++;
	97
	98	evlist__disable(evlist);
	99
	100	md = &evlist->mmap[0];
	101	if (perf_mmap__read_init(&md->core) < 0)
	102	goto out_init;
	103
	104	while ((event = perf_mmap__read_event(&md->core)) != NULL) {
	105	struct perf_sample sample;
	106
	107	perf_sample__init(&sample, /all=/false);
	108	if (event->header.type != PERF_RECORD_SAMPLE)
	109	goto next_event;
	110
	111	err = evlist__parse_sample(evlist, event, &sample);
	112	if (err < 0) {
	113	pr_debug("Error during parse sample\n");
	114	perf_sample__exit(&sample);
	115	goto out_delete_evlist;
	116	}
	117
	118	total_periods += sample.period;
	119	nr_samples++;
	120	next_event:
	121	perf_mmap__consume(&md->core);
	122	perf_sample__exit(&sample);
	123	}
	124	perf_mmap__read_done(&md->core);
	125
	126	out_init:
	127	if ((u64) nr_samples == total_periods) {
	128	pr_debug("All (%d) samples have period value of 1!\n",
	129	nr_samples);
	130	err = -1;
	131	}
	132
	133	out_delete_evlist:
	134	perf_cpu_map__put(cpus);
	135	perf_thread_map__put(threads);
	136	evlist__delete(evlist);
	137	return err;
	138	}
	139
	140	static int test__sw_clock_freq(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
	141	{
	142	int ret;
	143
	144	ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
	145	if (!ret)
	146	ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
	147
	148	return ret;
	149	}
	150
	151	DEFINE_SUITE("Software clock events period values", sw_clock_freq);