// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE // needed for sched.h to get sched_[gs]etaffinity and CPU_(ZERO,SET)
#include <inttypes.h>
#include <sched.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <stdlib.h>
#include <linux/perf_event.h>
#include <linux/limits.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/prctl.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <perf/evlist.h>
#include <perf/evsel.h>
#include <perf/mmap.h>
#include <perf/event.h>
#include <internal/tests.h>
#include <api/fs/fs.h>
#include "tests.h"
#include <internal/evsel.h>
#define EVENT_NUM 15
#define WAIT_COUNT 100000000UL
static int libperf_print(enum libperf_print_level level,
const char *fmt, va_list ap)
{
return vfprintf(stderr, fmt, ap);
}
static int test_stat_cpu(void)
{
struct perf_cpu_map *cpus;
struct perf_evlist *evlist;
struct perf_evsel *evsel, *leader;
struct perf_event_attr attr1 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_CPU_CLOCK,
};
struct perf_event_attr attr2 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_TASK_CLOCK,
};
int err, idx;
cpus = perf_cpu_map__new_online_cpus();
__T("failed to create cpus", cpus);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
evsel = leader = perf_evsel__new(&attr1);
__T("failed to create evsel1", evsel);
perf_evlist__add(evlist, evsel);
evsel = perf_evsel__new(&attr2);
__T("failed to create evsel2", evsel);
perf_evlist__add(evlist, evsel);
perf_evlist__set_leader(evlist);
__T("failed to set leader", leader->leader == leader);
__T("failed to set leader", evsel->leader == leader);
perf_evlist__set_maps(evlist, cpus, NULL);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
perf_evlist__for_each_evsel(evlist, evsel) {
cpus = perf_evsel__cpus(evsel);
for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) {
struct perf_counts_values counts = { .val = 0 };
perf_evsel__read(evsel, idx, 0, &counts);
__T("failed to read value for evsel", counts.val != 0);
}
}
perf_evlist__close(evlist);
perf_evlist__delete(evlist);
perf_cpu_map__put(cpus);
return 0;
}
static int test_stat_thread(void)
{
struct perf_counts_values counts = { .val = 0 };
struct perf_thread_map *threads;
struct perf_evlist *evlist;
struct perf_evsel *evsel, *leader;
struct perf_event_attr attr1 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_CPU_CLOCK,
};
struct perf_event_attr attr2 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_TASK_CLOCK,
};
int err;
threads = perf_thread_map__new_dummy();
__T("failed to create threads", threads);
perf_thread_map__set_pid(threads, 0, 0);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
evsel = leader = perf_evsel__new(&attr1);
__T("failed to create evsel1", evsel);
perf_evlist__add(evlist, evsel);
evsel = perf_evsel__new(&attr2);
__T("failed to create evsel2", evsel);
perf_evlist__add(evlist, evsel);
perf_evlist__set_leader(evlist);
__T("failed to set leader", leader->leader == leader);
__T("failed to set leader", evsel->leader == leader);
perf_evlist__set_maps(evlist, NULL, threads);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
perf_evlist__for_each_evsel(evlist, evsel) {
perf_evsel__read(evsel, 0, 0, &counts);
__T("failed to read value for evsel", counts.val != 0);
}
perf_evlist__close(evlist);
perf_evlist__delete(evlist);
perf_thread_map__put(threads);
return 0;
}
static int test_stat_thread_enable(void)
{
struct perf_counts_values counts = { .val = 0 };
struct perf_thread_map *threads;
struct perf_evlist *evlist;
struct perf_evsel *evsel, *leader;
struct perf_event_attr attr1 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_CPU_CLOCK,
.disabled = 1,
};
struct perf_event_attr attr2 = {
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_TASK_CLOCK,
.disabled = 1,
};
int err;
threads = perf_thread_map__new_dummy();
__T("failed to create threads", threads);
perf_thread_map__set_pid(threads, 0, 0);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
evsel = leader = perf_evsel__new(&attr1);
__T("failed to create evsel1", evsel);
perf_evlist__add(evlist, evsel);
evsel = perf_evsel__new(&attr2);
__T("failed to create evsel2", evsel);
perf_evlist__add(evlist, evsel);
perf_evlist__set_leader(evlist);
__T("failed to set leader", leader->leader == leader);
__T("failed to set leader", evsel->leader == leader);
perf_evlist__set_maps(evlist, NULL, threads);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
perf_evlist__for_each_evsel(evlist, evsel) {
perf_evsel__read(evsel, 0, 0, &counts);
__T("failed to read value for evsel", counts.val == 0);
}
perf_evlist__enable(evlist);
perf_evlist__for_each_evsel(evlist, evsel) {
perf_evsel__read(evsel, 0, 0, &counts);
__T("failed to read value for evsel", counts.val != 0);
}
perf_evlist__disable(evlist);
perf_evlist__close(evlist);
perf_evlist__delete(evlist);
perf_thread_map__put(threads);
return 0;
}
static int test_mmap_thread(void)
{
struct perf_evlist *evlist;
struct perf_evsel *evsel;
struct perf_mmap *map;
struct perf_cpu_map *cpus;
struct perf_thread_map *threads;
struct perf_event_attr attr = {
.type = PERF_TYPE_TRACEPOINT,
.sample_period = 1,
.wakeup_watermark = 1,
.disabled = 1,
};
char path[PATH_MAX];
int id, err, pid, go_pipe[2];
union perf_event *event;
int count = 0;
snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id",
sysfs__mountpoint());
if (filename__read_int(path, &id)) {
tests_failed++;
fprintf(stderr, "error: failed to get tracepoint id: %s\n", path);
return -1;
}
attr.config = id;
err = pipe(go_pipe);
__T("failed to create pipe", err == 0);
fflush(NULL);
pid = fork();
if (!pid) {
int i;
char bf;
read(go_pipe[0], &bf, 1);
/* Generate 100 prctl calls. */
for (i = 0; i < 100; i++)
prctl(0, 0, 0, 0, 0);
exit(0);
}
threads = perf_thread_map__new_dummy();
__T("failed to create threads", threads);
cpus = perf_cpu_map__new_any_cpu();
__T("failed to create cpus", cpus);
perf_thread_map__set_pid(threads, 0, pid);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
evsel = perf_evsel__new(&attr);
__T("failed to create evsel1", evsel);
__T("failed to set leader", evsel->leader == evsel);
perf_evlist__add(evlist, evsel);
perf_evlist__set_maps(evlist, cpus, threads);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
err = perf_evlist__mmap(evlist, 4);
__T("failed to mmap evlist", err == 0);
perf_evlist__enable(evlist);
/* kick the child and wait for it to finish */
write(go_pipe[1], "A", 1);
waitpid(pid, NULL, 0);
/*
* There's no need to call perf_evlist__disable,
* monitored process is dead now.
*/
perf_evlist__for_each_mmap(evlist, map, false) {
if (perf_mmap__read_init(map) < 0)
continue;
while ((event = perf_mmap__read_event(map)) != NULL) {
count++;
perf_mmap__consume(map);
}
perf_mmap__read_done(map);
}
/* calls perf_evlist__munmap/perf_evlist__close */
perf_evlist__delete(evlist);
perf_thread_map__put(threads);
perf_cpu_map__put(cpus);
/*
* The generated prctl calls should match the
* number of events in the buffer.
*/
__T("failed count", count == 100);
return 0;
}
static int test_mmap_cpus(void)
{
struct perf_evlist *evlist;
struct perf_evsel *evsel;
struct perf_mmap *map;
struct perf_cpu_map *cpus;
struct perf_event_attr attr = {
.type = PERF_TYPE_TRACEPOINT,
.sample_period = 1,
.wakeup_watermark = 1,
.disabled = 1,
};
cpu_set_t saved_mask;
char path[PATH_MAX];
int id, err, tmp;
struct perf_cpu cpu;
union perf_event *event;
int count = 0;
snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id",
sysfs__mountpoint());
if (filename__read_int(path, &id)) {
fprintf(stderr, "error: failed to get tracepoint id: %s\n", path);
return -1;
}
attr.config = id;
cpus = perf_cpu_map__new_online_cpus();
__T("failed to create cpus", cpus);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
evsel = perf_evsel__new(&attr);
__T("failed to create evsel1", evsel);
__T("failed to set leader", evsel->leader == evsel);
perf_evlist__add(evlist, evsel);
perf_evlist__set_maps(evlist, cpus, NULL);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
err = perf_evlist__mmap(evlist, 4);
__T("failed to mmap evlist", err == 0);
perf_evlist__enable(evlist);
err = sched_getaffinity(0, sizeof(saved_mask), &saved_mask);
__T("sched_getaffinity failed", err == 0);
perf_cpu_map__for_each_cpu(cpu, tmp, cpus) {
cpu_set_t mask;
CPU_ZERO(&mask);
CPU_SET(cpu.cpu, &mask);
err = sched_setaffinity(0, sizeof(mask), &mask);
__T("sched_setaffinity failed", err == 0);
prctl(0, 0, 0, 0, 0);
}
err = sched_setaffinity(0, sizeof(saved_mask), &saved_mask);
__T("sched_setaffinity failed", err == 0);
perf_evlist__disable(evlist);
perf_evlist__for_each_mmap(evlist, map, false) {
if (perf_mmap__read_init(map) < 0)
continue;
while ((event = perf_mmap__read_event(map)) != NULL) {
count++;
perf_mmap__consume(map);
}
perf_mmap__read_done(map);
}
/* calls perf_evlist__munmap/perf_evlist__close */
perf_evlist__delete(evlist);
/*
* The generated prctl events should match the
* number of cpus or be bigger (we are system-wide).
*/
__T("failed count", count >= perf_cpu_map__nr(cpus));
perf_cpu_map__put(cpus);
return 0;
}
static double display_error(long long average,
long long high,
long long low,
long long expected)
{
double error;
error = (((double)average - expected) / expected) * 100.0;
__T_VERBOSE(" Expected: %lld\n", expected);
__T_VERBOSE(" High: %lld Low: %lld Average: %lld\n",
high, low, average);
__T_VERBOSE(" Average Error = %.2f%%\n", error);
return error;
}
static int test_stat_multiplexing(void)
{
struct perf_counts_values expected_counts = { .val = 0 };
struct perf_counts_values counts[EVENT_NUM] = {{ .val = 0 },};
struct perf_thread_map *threads;
struct perf_evlist *evlist;
struct perf_evsel *evsel;
struct perf_event_attr attr = {
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_INSTRUCTIONS,
.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
PERF_FORMAT_TOTAL_TIME_RUNNING,
.disabled = 1,
};
int err, i, nonzero = 0;
unsigned long count;
long long max = 0, min = 0, avg = 0;
double error = 0.0;
s8 scaled = 0;
/* read for non-multiplexing event count */
threads = perf_thread_map__new_dummy();
__T("failed to create threads", threads);
perf_thread_map__set_pid(threads, 0, 0);
evsel = perf_evsel__new(&attr);
__T("failed to create evsel", evsel);
err = perf_evsel__open(evsel, NULL, threads);
__T("failed to open evsel", err == 0);
err = perf_evsel__enable(evsel);
__T("failed to enable evsel", err == 0);
/* wait loop */
count = WAIT_COUNT;
while (count--)
;
perf_evsel__read(evsel, 0, 0, &expected_counts);
__T("failed to read value for evsel", expected_counts.val != 0);
__T("failed to read non-multiplexing event count",
expected_counts.ena == expected_counts.run);
err = perf_evsel__disable(evsel);
__T("failed to enable evsel", err == 0);
perf_evsel__close(evsel);
perf_evsel__delete(evsel);
perf_thread_map__put(threads);
/* read for multiplexing event count */
threads = perf_thread_map__new_dummy();
__T("failed to create threads", threads);
perf_thread_map__set_pid(threads, 0, 0);
evlist = perf_evlist__new();
__T("failed to create evlist", evlist);
for (i = 0; i < EVENT_NUM; i++) {
evsel = perf_evsel__new(&attr);
__T("failed to create evsel", evsel);
perf_evlist__add(evlist, evsel);
}
perf_evlist__set_maps(evlist, NULL, threads);
err = perf_evlist__open(evlist);
__T("failed to open evlist", err == 0);
perf_evlist__enable(evlist);
/* wait loop */
count = WAIT_COUNT;
while (count--)
;
i = 0;
perf_evlist__for_each_evsel(evlist, evsel) {
perf_evsel__read(evsel, 0, 0, &counts[i]);
__T("failed to read value for evsel", counts[i].val != 0);
i++;
}
perf_evlist__disable(evlist);
min = counts[0].val;
for (i = 0; i < EVENT_NUM; i++) {
__T_VERBOSE("Event %2d -- Raw count = %" PRIu64 ", run = %" PRIu64 ", enable = %" PRIu64 "\n",
i, counts[i].val, counts[i].run, counts[i].ena);
perf_counts_values__scale(&counts[i], true, &scaled);
if (scaled == 1) {
__T_VERBOSE("\t Scaled count = %" PRIu64 " (%.2lf%%, %" PRIu64 "/%" PRIu64 ")\n",
counts[i].val,
(double)counts[i].run / (double)counts[i].ena * 100.0,
counts[i].run, counts[i].ena);
} else if (scaled == -1) {
__T_VERBOSE("\t Not Running\n");
} else {
__T_VERBOSE("\t Not Scaling\n");
}
if (counts[i].val > max)
max = counts[i].val;
if (counts[i].val < min)
min = counts[i].val;
avg += counts[i].val;
if (counts[i].val != 0)
nonzero++;
}
if (nonzero != 0)
avg = avg / nonzero;
else
avg = 0;
error = display_error(avg, max, min, expected_counts.val);
__T("Error out of range!", ((error <= 1.0) && (error >= -1.0)));
perf_evlist__close(evlist);
perf_evlist__delete(evlist);
perf_thread_map__put(threads);
return 0;
}
int test_evlist(int argc, char **argv)
{
__T_START;
libperf_init(libperf_print);
test_stat_cpu();
test_stat_thread();
test_stat_thread_enable();
test_mmap_thread();
test_mmap_cpus();
test_stat_multiplexing();
__T_END;
return tests_failed == 0 ? 0 : -1;
}
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