// SPDX-License-Identifier: GPL-2.0
|
#include <sys/time.h>
|
#include <sys/prctl.h>
|
#include <errno.h>
|
#include <time.h>
|
#include <stdlib.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 perf_evsel *switch_evsel;
|
struct perf_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 perf_evlist *evlist,
|
union perf_event *event,
|
struct switch_tracking *switch_tracking)
|
{
|
struct perf_sample sample;
|
struct perf_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 perf_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 perf_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(&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 perf_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 thread_map *threads = NULL;
|
struct cpu_map *cpus = NULL;
|
struct perf_evlist *evlist = NULL;
|
struct perf_evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
|
struct perf_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 = perf_evlist__new();
|
if (!evlist) {
|
pr_debug("perf_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 (perf_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;
|
}
|
|
perf_evlist__enable(evlist);
|
|
err = perf_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 = perf_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 = perf_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;
|
}
|
|
perf_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) {
|
perf_evlist__disable(evlist);
|
perf_evlist__delete(evlist);
|
} else {
|
cpu_map__put(cpus);
|
thread_map__put(threads);
|
}
|
|
return err;
|
|
out_err:
|
err = -1;
|
goto out;
|
}
|
