[linux-2.6-block.git] / tools / perf / tests / switch-tracking.c

// SPDX-License-Identifier: GPL-2.0
#include <sys/time.h>
#include <sys/prctl.h>
#include <errno.h>
#include <time.h>
#include <stdlib.h>
#include <linux/zalloc.h>

#include "parse-events.h"
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
#include "cpumap.h"
#include "tests.h"

static int spin_sleep(void)
{
	struct timeval start, now, diff, maxtime;
	struct timespec ts;
	int err, i;

	maxtime.tv_sec = 0;
	maxtime.tv_usec = 50000;

	err = gettimeofday(&start, NULL);
	if (err)
		return err;

	/* Spin for 50ms */
	while (1) {
		for (i = 0; i < 1000; i++)
			barrier();

		err = gettimeofday(&now, NULL);
		if (err)
			return err;

		timersub(&now, &start, &diff);
		if (timercmp(&diff, &maxtime, > /* For checkpatch */))
			break;
	}

	ts.tv_nsec = 50 * 1000 * 1000;
	ts.tv_sec = 0;

	/* Sleep for 50ms */
	err = nanosleep(&ts, NULL);
	if (err == EINTR)
		err = 0;

	return err;
}

struct switch_tracking {
	struct evsel *switch_evsel;
	struct evsel *cycles_evsel;
	pid_t *tids;
	int nr_tids;
	int comm_seen[4];
	int cycles_before_comm_1;
	int cycles_between_comm_2_and_comm_3;
	int cycles_after_comm_4;
};

static int check_comm(struct switch_tracking *switch_tracking,
		      union perf_event *event, const char *comm, int nr)
{
	if (event->header.type == PERF_RECORD_COMM &&
	    (pid_t)event->comm.pid == getpid() &&
	    (pid_t)event->comm.tid == getpid() &&
	    strcmp(event->comm.comm, comm) == 0) {
		if (switch_tracking->comm_seen[nr]) {
			pr_debug("Duplicate comm event\n");
			return -1;
		}
		switch_tracking->comm_seen[nr] = 1;
		pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
		return 1;
	}
	return 0;
}

static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
{
	int i, nr = cpu + 1;

	if (cpu < 0)
		return -1;

	if (!switch_tracking->tids) {
		switch_tracking->tids = calloc(nr, sizeof(pid_t));
		if (!switch_tracking->tids)
			return -1;
		for (i = 0; i < nr; i++)
			switch_tracking->tids[i] = -1;
		switch_tracking->nr_tids = nr;
		return 0;
	}

	if (cpu >= switch_tracking->nr_tids) {
		void *addr;

		addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
		if (!addr)
			return -1;
		switch_tracking->tids = addr;
		for (i = switch_tracking->nr_tids; i < nr; i++)
			switch_tracking->tids[i] = -1;
		switch_tracking->nr_tids = nr;
		return 0;
	}

	return 0;
}

static int process_sample_event(struct evlist *evlist,
				union perf_event *event,
				struct switch_tracking *switch_tracking)
{
	struct perf_sample sample;
	struct evsel *evsel;
	pid_t next_tid, prev_tid;
	int cpu, err;

	if (perf_evlist__parse_sample(evlist, event, &sample)) {
		pr_debug("perf_evlist__parse_sample failed\n");
		return -1;
	}

	evsel = perf_evlist__id2evsel(evlist, sample.id);
	if (evsel == switch_tracking->switch_evsel) {
		next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
		prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
		cpu = sample.cpu;
		pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
			  cpu, prev_tid, next_tid);
		err = check_cpu(switch_tracking, cpu);
		if (err)
			return err;
		/*
		 * Check for no missing sched_switch events i.e. that the
		 * evsel->system_wide flag has worked.
		 */
		if (switch_tracking->tids[cpu] != -1 &&
		    switch_tracking->tids[cpu] != prev_tid) {
			pr_debug("Missing sched_switch events\n");
			return -1;
		}
		switch_tracking->tids[cpu] = next_tid;
	}

	if (evsel == switch_tracking->cycles_evsel) {
		pr_debug3("cycles event\n");
		if (!switch_tracking->comm_seen[0])
			switch_tracking->cycles_before_comm_1 = 1;
		if (switch_tracking->comm_seen[1] &&
		    !switch_tracking->comm_seen[2])
			switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
		if (switch_tracking->comm_seen[3])
			switch_tracking->cycles_after_comm_4 = 1;
	}

	return 0;
}

static int process_event(struct evlist *evlist, union perf_event *event,
			 struct switch_tracking *switch_tracking)
{
	if (event->header.type == PERF_RECORD_SAMPLE)
		return process_sample_event(evlist, event, switch_tracking);

	if (event->header.type == PERF_RECORD_COMM) {
		int err, done = 0;

		err = check_comm(switch_tracking, event, "Test COMM 1", 0);
		if (err < 0)
			return -1;
		done += err;
		err = check_comm(switch_tracking, event, "Test COMM 2", 1);
		if (err < 0)
			return -1;
		done += err;
		err = check_comm(switch_tracking, event, "Test COMM 3", 2);
		if (err < 0)
			return -1;
		done += err;
		err = check_comm(switch_tracking, event, "Test COMM 4", 3);
		if (err < 0)
			return -1;
		done += err;
		if (done != 1) {
			pr_debug("Unexpected comm event\n");
			return -1;
		}
	}

	return 0;
}

struct event_node {
	struct list_head list;
	union perf_event *event;
	u64 event_time;
};

static int add_event(struct evlist *evlist, struct list_head *events,
		     union perf_event *event)
{
	struct perf_sample sample;
	struct event_node *node;

	node = malloc(sizeof(struct event_node));
	if (!node) {
		pr_debug("malloc failed\n");
		return -1;
	}
	node->event = event;
	list_add(&node->list, events);

	if (perf_evlist__parse_sample(evlist, event, &sample)) {
		pr_debug("perf_evlist__parse_sample failed\n");
		return -1;
	}

	if (!sample.time) {
		pr_debug("event with no time\n");
		return -1;
	}

	node->event_time = sample.time;

	return 0;
}

static void free_event_nodes(struct list_head *events)
{
	struct event_node *node;

	while (!list_empty(events)) {
		node = list_entry(events->next, struct event_node, list);
		list_del_init(&node->list);
		free(node);
	}
}

static int compar(const void *a, const void *b)
{
	const struct event_node *nodea = a;
	const struct event_node *nodeb = b;
	s64 cmp = nodea->event_time - nodeb->event_time;

	return cmp;
}

static int process_events(struct evlist *evlist,
			  struct switch_tracking *switch_tracking)
{
	union perf_event *event;
	unsigned pos, cnt = 0;
	LIST_HEAD(events);
	struct event_node *events_array, *node;
	struct perf_mmap *md;
	int i, ret;

	for (i = 0; i < evlist->nr_mmaps; i++) {
		md = &evlist->mmap[i];
		if (perf_mmap__read_init(md) < 0)
			continue;

		while ((event = perf_mmap__read_event(md)) != NULL) {
			cnt += 1;
			ret = add_event(evlist, &events, event);
			 perf_mmap__consume(md);
			if (ret < 0)
				goto out_free_nodes;
		}
		perf_mmap__read_done(md);
	}

	events_array = calloc(cnt, sizeof(struct event_node));
	if (!events_array) {
		pr_debug("calloc failed\n");
		ret = -1;
		goto out_free_nodes;
	}

	pos = 0;
	list_for_each_entry(node, &events, list)
		events_array[pos++] = *node;

	qsort(events_array, cnt, sizeof(struct event_node), compar);

	for (pos = 0; pos < cnt; pos++) {
		ret = process_event(evlist, events_array[pos].event,
				    switch_tracking);
		if (ret < 0)
			goto out_free;
	}

	ret = 0;
out_free:
	pr_debug("%u events recorded\n", cnt);
	free(events_array);
out_free_nodes:
	free_event_nodes(&events);
	return ret;
}

/**
 * test__switch_tracking - test using sched_switch and tracking events.
 *
 * This function implements a test that checks that sched_switch events and
 * tracking events can be recorded for a workload (current process) using the
 * evsel->system_wide and evsel->tracking flags (respectively) with other events
 * sometimes enabled or disabled.
 */
int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
{
	const char *sched_switch = "sched:sched_switch";
	struct switch_tracking switch_tracking = { .tids = NULL, };
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 4000,
		.target		     = {
			.uses_mmap   = true,
		},
	};
	struct perf_thread_map *threads = NULL;
	struct perf_cpu_map *cpus = NULL;
	struct evlist *evlist = NULL;
	struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
	struct evsel *switch_evsel, *tracking_evsel;
	const char *comm;
	int err = -1;

	threads = thread_map__new(-1, getpid(), UINT_MAX);
	if (!threads) {
		pr_debug("thread_map__new failed!\n");
		goto out_err;
	}

	cpus = cpu_map__new(NULL);
	if (!cpus) {
		pr_debug("cpu_map__new failed!\n");
		goto out_err;
	}

	evlist = evlist__new();
	if (!evlist) {
		pr_debug("evlist__new failed!\n");
		goto out_err;
	}

	perf_evlist__set_maps(evlist, cpus, threads);

	/* First event */
	err = parse_events(evlist, "cpu-clock:u", NULL);
	if (err) {
		pr_debug("Failed to parse event dummy:u\n");
		goto out_err;
	}

	cpu_clocks_evsel = perf_evlist__last(evlist);

	/* Second event */
	err = parse_events(evlist, "cycles:u", NULL);
	if (err) {
		pr_debug("Failed to parse event cycles:u\n");
		goto out_err;
	}

	cycles_evsel = perf_evlist__last(evlist);

	/* Third event */
	if (!perf_evlist__can_select_event(evlist, sched_switch)) {
		pr_debug("No sched_switch\n");
		err = 0;
		goto out;
	}

	err = parse_events(evlist, sched_switch, NULL);
	if (err) {
		pr_debug("Failed to parse event %s\n", sched_switch);
		goto out_err;
	}

	switch_evsel = perf_evlist__last(evlist);

	perf_evsel__set_sample_bit(switch_evsel, CPU);
	perf_evsel__set_sample_bit(switch_evsel, TIME);

	switch_evsel->system_wide = true;
	switch_evsel->no_aux_samples = true;
	switch_evsel->immediate = true;

	/* Test moving an event to the front */
	if (cycles_evsel == perf_evlist__first(evlist)) {
		pr_debug("cycles event already at front");
		goto out_err;
	}
	perf_evlist__to_front(evlist, cycles_evsel);
	if (cycles_evsel != perf_evlist__first(evlist)) {
		pr_debug("Failed to move cycles event to front");
		goto out_err;
	}

	perf_evsel__set_sample_bit(cycles_evsel, CPU);
	perf_evsel__set_sample_bit(cycles_evsel, TIME);

	/* Fourth event */
	err = parse_events(evlist, "dummy:u", NULL);
	if (err) {
		pr_debug("Failed to parse event dummy:u\n");
		goto out_err;
	}

	tracking_evsel = perf_evlist__last(evlist);

	perf_evlist__set_tracking_event(evlist, tracking_evsel);

	tracking_evsel->attr.freq = 0;
	tracking_evsel->attr.sample_period = 1;

	perf_evsel__set_sample_bit(tracking_evsel, TIME);

	/* Config events */
	perf_evlist__config(evlist, &opts, NULL);

	/* Check moved event is still at the front */
	if (cycles_evsel != perf_evlist__first(evlist)) {
		pr_debug("Front event no longer at front");
		goto out_err;
	}

	/* Check tracking event is tracking */
	if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) {
		pr_debug("Tracking event not tracking\n");
		goto out_err;
	}

	/* Check non-tracking events are not tracking */
	evlist__for_each_entry(evlist, evsel) {
		if (evsel != tracking_evsel) {
			if (evsel->attr.mmap || evsel->attr.comm) {
				pr_debug("Non-tracking event is tracking\n");
				goto out_err;
			}
		}
	}

	if (evlist__open(evlist) < 0) {
		pr_debug("Not supported\n");
		err = 0;
		goto out;
	}

	err = perf_evlist__mmap(evlist, UINT_MAX);
	if (err) {
		pr_debug("perf_evlist__mmap failed!\n");
		goto out_err;
	}

	evlist__enable(evlist);

	err = evsel__disable(cpu_clocks_evsel);
	if (err) {
		pr_debug("perf_evlist__disable_event failed!\n");
		goto out_err;
	}

	err = spin_sleep();
	if (err) {
		pr_debug("spin_sleep failed!\n");
		goto out_err;
	}

	comm = "Test COMM 1";
	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	if (err) {
		pr_debug("PR_SET_NAME failed!\n");
		goto out_err;
	}

	err = evsel__disable(cycles_evsel);
	if (err) {
		pr_debug("perf_evlist__disable_event failed!\n");
		goto out_err;
	}

	comm = "Test COMM 2";
	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	if (err) {
		pr_debug("PR_SET_NAME failed!\n");
		goto out_err;
	}

	err = spin_sleep();
	if (err) {
		pr_debug("spin_sleep failed!\n");
		goto out_err;
	}

	comm = "Test COMM 3";
	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	if (err) {
		pr_debug("PR_SET_NAME failed!\n");
		goto out_err;
	}

	err = evsel__enable(cycles_evsel);
	if (err) {
		pr_debug("perf_evlist__disable_event failed!\n");
		goto out_err;
	}

	comm = "Test COMM 4";
	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	if (err) {
		pr_debug("PR_SET_NAME failed!\n");
		goto out_err;
	}

	err = spin_sleep();
	if (err) {
		pr_debug("spin_sleep failed!\n");
		goto out_err;
	}

	evlist__disable(evlist);

	switch_tracking.switch_evsel = switch_evsel;
	switch_tracking.cycles_evsel = cycles_evsel;

	err = process_events(evlist, &switch_tracking);

	zfree(&switch_tracking.tids);

	if (err)
		goto out_err;

	/* Check all 4 comm events were seen i.e. that evsel->tracking works */
	if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
	    !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
		pr_debug("Missing comm events\n");
		goto out_err;
	}

	/* Check cycles event got enabled */
	if (!switch_tracking.cycles_before_comm_1) {
		pr_debug("Missing cycles events\n");
		goto out_err;
	}

	/* Check cycles event got disabled */
	if (switch_tracking.cycles_between_comm_2_and_comm_3) {
		pr_debug("cycles events even though event was disabled\n");
		goto out_err;
	}

	/* Check cycles event got enabled again */
	if (!switch_tracking.cycles_after_comm_4) {
		pr_debug("Missing cycles events\n");
		goto out_err;
	}
out:
	if (evlist) {
		evlist__disable(evlist);
		evlist__delete(evlist);
	} else {
		perf_cpu_map__put(cpus);
		perf_thread_map__put(threads);
	}

	return err;

out_err:
	err = -1;
	goto out;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
d44bc558 AH	2	#include <sys/time.h>
d44bc558 AH	3	#include <sys/prctl.h>
a43783ae	4	#include <errno.h>
d44bc558 AH	5	#include <time.h>
d44bc558 AH	6	#include <stdlib.h>
7f7c536f	7	#include <linux/zalloc.h>
d44bc558 AH	8
	9	#include "parse-events.h"
	10	#include "evlist.h"
	11	#include "evsel.h"
	12	#include "thread_map.h"
	13	#include "cpumap.h"
	14	#include "tests.h"
	15
	16	static int spin_sleep(void)
	17	{
	18	struct timeval start, now, diff, maxtime;
	19	struct timespec ts;
	20	int err, i;
	21
	22	maxtime.tv_sec = 0;
	23	maxtime.tv_usec = 50000;
	24
	25	err = gettimeofday(&start, NULL);
	26	if (err)
	27	return err;
	28
	29	/* Spin for 50ms */
	30	while (1) {
	31	for (i = 0; i < 1000; i++)
	32	barrier();
	33
	34	err = gettimeofday(&now, NULL);
	35	if (err)
	36	return err;
	37
	38	timersub(&now, &start, &diff);
	39	if (timercmp(&diff, &maxtime, > /* For checkpatch */))
	40	break;
	41	}
	42
	43	ts.tv_nsec = 50 * 1000 * 1000;
	44	ts.tv_sec = 0;
	45
	46	/* Sleep for 50ms */
	47	err = nanosleep(&ts, NULL);
	48	if (err == EINTR)
	49	err = 0;
	50
	51	return err;
	52	}
	53
	54	struct switch_tracking {
32dcd021 JO	55	struct evsel *switch_evsel;
32dcd021 JO	56	struct evsel *cycles_evsel;
d44bc558 AH	57	pid_t *tids;
	58	int nr_tids;
	59	int comm_seen[4];
	60	int cycles_before_comm_1;
	61	int cycles_between_comm_2_and_comm_3;
	62	int cycles_after_comm_4;
	63	};
	64
	65	static int check_comm(struct switch_tracking *switch_tracking,
	66	union perf_event event, const char comm, int nr)
	67	{
	68	if (event->header.type == PERF_RECORD_COMM &&
	69	(pid_t)event->comm.pid == getpid() &&
	70	(pid_t)event->comm.tid == getpid() &&
	71	strcmp(event->comm.comm, comm) == 0) {
	72	if (switch_tracking->comm_seen[nr]) {
	73	pr_debug("Duplicate comm event\n");
	74	return -1;
	75	}
	76	switch_tracking->comm_seen[nr] = 1;
	77	pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
	78	return 1;
	79	}
	80	return 0;
	81	}
	82
	83	static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
	84	{
	85	int i, nr = cpu + 1;
	86
	87	if (cpu < 0)
	88	return -1;
	89
	90	if (!switch_tracking->tids) {
	91	switch_tracking->tids = calloc(nr, sizeof(pid_t));
	92	if (!switch_tracking->tids)
	93	return -1;
	94	for (i = 0; i < nr; i++)
	95	switch_tracking->tids[i] = -1;
	96	switch_tracking->nr_tids = nr;
	97	return 0;
	98	}
	99
	100	if (cpu >= switch_tracking->nr_tids) {
	101	void *addr;
	102
	103	addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
	104	if (!addr)
	105	return -1;
	106	switch_tracking->tids = addr;
	107	for (i = switch_tracking->nr_tids; i < nr; i++)
	108	switch_tracking->tids[i] = -1;
	109	switch_tracking->nr_tids = nr;
	110	return 0;
	111	}
	112
	113	return 0;
	114	}
	115
63503dba	116	static int process_sample_event(struct evlist *evlist,
d44bc558 AH	117	union perf_event *event,
	118	struct switch_tracking *switch_tracking)
	119	{
	120	struct perf_sample sample;
32dcd021	121	struct evsel *evsel;
d44bc558 AH	122	pid_t next_tid, prev_tid;
	123	int cpu, err;
	124
	125	if (perf_evlist__parse_sample(evlist, event, &sample)) {
	126	pr_debug("perf_evlist__parse_sample failed\n");
	127	return -1;
	128	}
	129
	130	evsel = perf_evlist__id2evsel(evlist, sample.id);
	131	if (evsel == switch_tracking->switch_evsel) {
	132	next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
	133	prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
	134	cpu = sample.cpu;
	135	pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
	136	cpu, prev_tid, next_tid);
	137	err = check_cpu(switch_tracking, cpu);
	138	if (err)
	139	return err;
	140	/*
	141	* Check for no missing sched_switch events i.e. that the
	142	* evsel->system_wide flag has worked.
	143	*/
	144	if (switch_tracking->tids[cpu] != -1 &&
	145	switch_tracking->tids[cpu] != prev_tid) {
	146	pr_debug("Missing sched_switch events\n");
	147	return -1;
	148	}
	149	switch_tracking->tids[cpu] = next_tid;
	150	}
	151
	152	if (evsel == switch_tracking->cycles_evsel) {
	153	pr_debug3("cycles event\n");
	154	if (!switch_tracking->comm_seen[0])
	155	switch_tracking->cycles_before_comm_1 = 1;
	156	if (switch_tracking->comm_seen[1] &&
	157	!switch_tracking->comm_seen[2])
	158	switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
	159	if (switch_tracking->comm_seen[3])
	160	switch_tracking->cycles_after_comm_4 = 1;
	161	}
	162
	163	return 0;
	164	}
	165
63503dba	166	static int process_event(struct evlist evlist, union perf_event event,
d44bc558 AH	167	struct switch_tracking *switch_tracking)
	168	{
	169	if (event->header.type == PERF_RECORD_SAMPLE)
	170	return process_sample_event(evlist, event, switch_tracking);
	171
	172	if (event->header.type == PERF_RECORD_COMM) {
	173	int err, done = 0;
	174
	175	err = check_comm(switch_tracking, event, "Test COMM 1", 0);
	176	if (err < 0)
	177	return -1;
	178	done += err;
	179	err = check_comm(switch_tracking, event, "Test COMM 2", 1);
	180	if (err < 0)
	181	return -1;
	182	done += err;
	183	err = check_comm(switch_tracking, event, "Test COMM 3", 2);
	184	if (err < 0)
	185	return -1;
	186	done += err;
	187	err = check_comm(switch_tracking, event, "Test COMM 4", 3);
	188	if (err < 0)
	189	return -1;
	190	done += err;
	191	if (done != 1) {
	192	pr_debug("Unexpected comm event\n");
	193	return -1;
	194	}
	195	}
	196
	197	return 0;
	198	}
	199
	200	struct event_node {
	201	struct list_head list;
	202	union perf_event *event;
	203	u64 event_time;
	204	};
	205
63503dba	206	static int add_event(struct evlist evlist, struct list_head events,
d44bc558 AH	207	union perf_event *event)
	208	{
	209	struct perf_sample sample;
	210	struct event_node *node;
	211
	212	node = malloc(sizeof(struct event_node));
	213	if (!node) {
	214	pr_debug("malloc failed\n");
	215	return -1;
	216	}
	217	node->event = event;
	218	list_add(&node->list, events);
	219
	220	if (perf_evlist__parse_sample(evlist, event, &sample)) {
	221	pr_debug("perf_evlist__parse_sample failed\n");
	222	return -1;
	223	}
	224
	225	if (!sample.time) {
	226	pr_debug("event with no time\n");
	227	return -1;
	228	}
	229
	230	node->event_time = sample.time;
	231
	232	return 0;
	233	}
	234
	235	static void free_event_nodes(struct list_head *events)
	236	{
	237	struct event_node *node;
	238
	239	while (!list_empty(events)) {
	240	node = list_entry(events->next, struct event_node, list);
e56fbc9d	241	list_del_init(&node->list);
d44bc558 AH	242	free(node);
	243	}
	244	}
	245
	246	static int compar(const void a, const void b)
	247	{
	248	const struct event_node *nodea = a;
	249	const struct event_node *nodeb = b;
	250	s64 cmp = nodea->event_time - nodeb->event_time;
	251
	252	return cmp;
	253	}
	254
63503dba	255	static int process_events(struct evlist *evlist,
d44bc558 AH	256	struct switch_tracking *switch_tracking)
	257	{
	258	union perf_event *event;
	259	unsigned pos, cnt = 0;
	260	LIST_HEAD(events);
	261	struct event_node events_array, node;
ee4024ff	262	struct perf_mmap *md;
d44bc558 AH	263	int i, ret;
	264
	265	for (i = 0; i < evlist->nr_mmaps; i++) {
ee4024ff	266	md = &evlist->mmap[i];
b9bae2c8	267	if (perf_mmap__read_init(md) < 0)
ee4024ff KL	268	continue;
ee4024ff KL	269
0019dc87	270	while ((event = perf_mmap__read_event(md)) != NULL) {
d44bc558 AH	271	cnt += 1;
d44bc558 AH	272	ret = add_event(evlist, &events, event);
d6ace3df	273	perf_mmap__consume(md);
d44bc558 AH	274	if (ret < 0)
	275	goto out_free_nodes;
	276	}
ee4024ff	277	perf_mmap__read_done(md);
d44bc558 AH	278	}
	279
	280	events_array = calloc(cnt, sizeof(struct event_node));
	281	if (!events_array) {
	282	pr_debug("calloc failed\n");
	283	ret = -1;
	284	goto out_free_nodes;
	285	}
	286
	287	pos = 0;
	288	list_for_each_entry(node, &events, list)
	289	events_array[pos++] = *node;
	290
	291	qsort(events_array, cnt, sizeof(struct event_node), compar);
	292
	293	for (pos = 0; pos < cnt; pos++) {
	294	ret = process_event(evlist, events_array[pos].event,
	295	switch_tracking);
	296	if (ret < 0)
	297	goto out_free;
	298	}
	299
	300	ret = 0;
	301	out_free:
	302	pr_debug("%u events recorded\n", cnt);
	303	free(events_array);
	304	out_free_nodes:
	305	free_event_nodes(&events);
	306	return ret;
	307	}
	308
	309	/**
	310	* test__switch_tracking - test using sched_switch and tracking events.
	311	*
	312	* This function implements a test that checks that sched_switch events and
	313	* tracking events can be recorded for a workload (current process) using the
	314	* evsel->system_wide and evsel->tracking flags (respectively) with other events
	315	* sometimes enabled or disabled.
	316	*/
81f17c90	317	int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
d44bc558 AH	318	{
	319	const char *sched_switch = "sched:sched_switch";
	320	struct switch_tracking switch_tracking = { .tids = NULL, };
	321	struct record_opts opts = {
	322	.mmap_pages = UINT_MAX,
	323	.user_freq = UINT_MAX,
	324	.user_interval = ULLONG_MAX,
	325	.freq = 4000,
	326	.target = {
	327	.uses_mmap = true,
	328	},
	329	};
9749b90e	330	struct perf_thread_map *threads = NULL;
f854839b	331	struct perf_cpu_map *cpus = NULL;
63503dba	332	struct evlist *evlist = NULL;
32dcd021 JO	333	struct evsel evsel, cpu_clocks_evsel, *cycles_evsel;
32dcd021 JO	334	struct evsel switch_evsel, tracking_evsel;
d44bc558 AH	335	const char *comm;
	336	int err = -1;
	337
	338	threads = thread_map__new(-1, getpid(), UINT_MAX);
	339	if (!threads) {
	340	pr_debug("thread_map__new failed!\n");
	341	goto out_err;
	342	}
	343
	344	cpus = cpu_map__new(NULL);
	345	if (!cpus) {
	346	pr_debug("cpu_map__new failed!\n");
	347	goto out_err;
	348	}
	349
0f98b11c	350	evlist = evlist__new();
d44bc558	351	if (!evlist) {
0f98b11c	352	pr_debug("evlist__new failed!\n");
d44bc558 AH	353	goto out_err;
	354	}
	355
	356	perf_evlist__set_maps(evlist, cpus, threads);
	357
	358	/* First event */
b39b8393	359	err = parse_events(evlist, "cpu-clock:u", NULL);
d44bc558 AH	360	if (err) {
	361	pr_debug("Failed to parse event dummy:u\n");
	362	goto out_err;
	363	}
	364
	365	cpu_clocks_evsel = perf_evlist__last(evlist);
	366
	367	/* Second event */
b39b8393	368	err = parse_events(evlist, "cycles:u", NULL);
d44bc558 AH	369	if (err) {
	370	pr_debug("Failed to parse event cycles:u\n");
	371	goto out_err;
	372	}
	373
	374	cycles_evsel = perf_evlist__last(evlist);
	375
	376	/* Third event */
	377	if (!perf_evlist__can_select_event(evlist, sched_switch)) {
597bdeb4	378	pr_debug("No sched_switch\n");
d44bc558 AH	379	err = 0;
	380	goto out;
	381	}
	382
b39b8393	383	err = parse_events(evlist, sched_switch, NULL);
d44bc558 AH	384	if (err) {
	385	pr_debug("Failed to parse event %s\n", sched_switch);
	386	goto out_err;
	387	}
	388
	389	switch_evsel = perf_evlist__last(evlist);
	390
	391	perf_evsel__set_sample_bit(switch_evsel, CPU);
	392	perf_evsel__set_sample_bit(switch_evsel, TIME);
	393
	394	switch_evsel->system_wide = true;
	395	switch_evsel->no_aux_samples = true;
	396	switch_evsel->immediate = true;
	397
	398	/* Test moving an event to the front */
	399	if (cycles_evsel == perf_evlist__first(evlist)) {
	400	pr_debug("cycles event already at front");
	401	goto out_err;
	402	}
	403	perf_evlist__to_front(evlist, cycles_evsel);
	404	if (cycles_evsel != perf_evlist__first(evlist)) {
	405	pr_debug("Failed to move cycles event to front");
	406	goto out_err;
	407	}
	408
	409	perf_evsel__set_sample_bit(cycles_evsel, CPU);
	410	perf_evsel__set_sample_bit(cycles_evsel, TIME);
	411
	412	/* Fourth event */
b39b8393	413	err = parse_events(evlist, "dummy:u", NULL);
d44bc558 AH	414	if (err) {
	415	pr_debug("Failed to parse event dummy:u\n");
	416	goto out_err;
	417	}
	418
	419	tracking_evsel = perf_evlist__last(evlist);
	420
	421	perf_evlist__set_tracking_event(evlist, tracking_evsel);
	422
	423	tracking_evsel->attr.freq = 0;
	424	tracking_evsel->attr.sample_period = 1;
	425
	426	perf_evsel__set_sample_bit(tracking_evsel, TIME);
	427
	428	/* Config events */
e68ae9cf	429	perf_evlist__config(evlist, &opts, NULL);
d44bc558 AH	430
	431	/* Check moved event is still at the front */
	432	if (cycles_evsel != perf_evlist__first(evlist)) {
	433	pr_debug("Front event no longer at front");
	434	goto out_err;
	435	}
	436
	437	/* Check tracking event is tracking */
	438	if (!tracking_evsel->attr.mmap \|\| !tracking_evsel->attr.comm) {
	439	pr_debug("Tracking event not tracking\n");
	440	goto out_err;
	441	}
	442
	443	/* Check non-tracking events are not tracking */
e5cadb93	444	evlist__for_each_entry(evlist, evsel) {
d44bc558 AH	445	if (evsel != tracking_evsel) {
	446	if (evsel->attr.mmap \|\| evsel->attr.comm) {
	447	pr_debug("Non-tracking event is tracking\n");
	448	goto out_err;
	449	}
	450	}
	451	}
	452
474ddc4c	453	if (evlist__open(evlist) < 0) {
597bdeb4	454	pr_debug("Not supported\n");
d44bc558 AH	455	err = 0;
	456	goto out;
	457	}
	458
f74b9d3a	459	err = perf_evlist__mmap(evlist, UINT_MAX);
d44bc558 AH	460	if (err) {
	461	pr_debug("perf_evlist__mmap failed!\n");
	462	goto out_err;
	463	}
	464
1c87f165	465	evlist__enable(evlist);
d44bc558	466
9a10bb22	467	err = evsel__disable(cpu_clocks_evsel);
d44bc558 AH	468	if (err) {
	469	pr_debug("perf_evlist__disable_event failed!\n");
	470	goto out_err;
	471	}
	472
	473	err = spin_sleep();
	474	if (err) {
	475	pr_debug("spin_sleep failed!\n");
	476	goto out_err;
	477	}
	478
	479	comm = "Test COMM 1";
	480	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	481	if (err) {
	482	pr_debug("PR_SET_NAME failed!\n");
	483	goto out_err;
	484	}
	485
9a10bb22	486	err = evsel__disable(cycles_evsel);
d44bc558 AH	487	if (err) {
	488	pr_debug("perf_evlist__disable_event failed!\n");
	489	goto out_err;
	490	}
	491
	492	comm = "Test COMM 2";
	493	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	494	if (err) {
	495	pr_debug("PR_SET_NAME failed!\n");
	496	goto out_err;
	497	}
	498
	499	err = spin_sleep();
	500	if (err) {
	501	pr_debug("spin_sleep failed!\n");
	502	goto out_err;
	503	}
	504
	505	comm = "Test COMM 3";
	506	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	507	if (err) {
	508	pr_debug("PR_SET_NAME failed!\n");
	509	goto out_err;
	510	}
	511
ec7f24ef	512	err = evsel__enable(cycles_evsel);
d44bc558 AH	513	if (err) {
	514	pr_debug("perf_evlist__disable_event failed!\n");
	515	goto out_err;
	516	}
	517
	518	comm = "Test COMM 4";
	519	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
	520	if (err) {
	521	pr_debug("PR_SET_NAME failed!\n");
	522	goto out_err;
	523	}
	524
	525	err = spin_sleep();
	526	if (err) {
	527	pr_debug("spin_sleep failed!\n");
	528	goto out_err;
	529	}
	530
e74676de	531	evlist__disable(evlist);
d44bc558 AH	532
	533	switch_tracking.switch_evsel = switch_evsel;
	534	switch_tracking.cycles_evsel = cycles_evsel;
	535
	536	err = process_events(evlist, &switch_tracking);
	537
	538	zfree(&switch_tracking.tids);
	539
	540	if (err)
	541	goto out_err;
	542
	543	/* Check all 4 comm events were seen i.e. that evsel->tracking works */
	544	if (!switch_tracking.comm_seen[0] \|\| !switch_tracking.comm_seen[1] \|\|
	545	!switch_tracking.comm_seen[2] \|\| !switch_tracking.comm_seen[3]) {
	546	pr_debug("Missing comm events\n");
	547	goto out_err;
	548	}
	549
	550	/* Check cycles event got enabled */
	551	if (!switch_tracking.cycles_before_comm_1) {
	552	pr_debug("Missing cycles events\n");
	553	goto out_err;
	554	}
	555
	556	/* Check cycles event got disabled */
	557	if (switch_tracking.cycles_between_comm_2_and_comm_3) {
	558	pr_debug("cycles events even though event was disabled\n");
	559	goto out_err;
	560	}
	561
	562	/* Check cycles event got enabled again */
	563	if (!switch_tracking.cycles_after_comm_4) {
	564	pr_debug("Missing cycles events\n");
	565	goto out_err;
	566	}
	567	out:
	568	if (evlist) {
e74676de	569	evlist__disable(evlist);
c12995a5	570	evlist__delete(evlist);
d44bc558	571	} else {
38f01d8d	572	perf_cpu_map__put(cpus);
7836e52e	573	perf_thread_map__put(threads);
d44bc558 AH	574	}
	575
	576	return err;
	577
	578	out_err:
	579	err = -1;
	580	goto out;
	581	}