This is xnu-10002.1.13. See this file in:
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>
#include <err.h>
#include <string.h>
#include <assert.h>
#include <sysexits.h>
#include <getopt.h>
#include <spawn.h>
#include <stdbool.h>
#include <sys/sysctl.h>
#include <mach/mach_time.h>
#include <mach/mach.h>
#include <mach/semaphore.h>
#include <TargetConditionals.h>
#ifdef T_NAMESPACE
#undef T_NAMESPACE
#endif
#include <darwintest.h>
#include <stdatomic.h>
T_GLOBAL_META(T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("scheduler"));
#define MAX_THREADS 32
#define SPIN_SECS 6
#define THR_SPINNER_PRI 63
#define THR_MANAGER_PRI 62
#define WARMUP_ITERATIONS 100
#define POWERCTRL_SUCCESS_STR "Factor1: 1.000000"
static mach_timebase_info_data_t timebase_info;
static semaphore_t semaphore;
static semaphore_t worker_sem;
static uint32_t g_numcpus;
static _Atomic uint32_t keep_going = 1;
static dt_stat_time_t s;
static struct {
pthread_t thread;
bool measure_thread;
} threads[MAX_THREADS];
static uint64_t
nanos_to_abs(uint64_t nanos)
{
return nanos * timebase_info.denom / timebase_info.numer;
}
extern char **environ;
static void
csw_perf_test_init(void)
{
int spawn_ret, pid;
char *const clpcctrl_args[] = {"/usr/local/bin/clpcctrl", "-f", "5000", NULL};
spawn_ret = posix_spawn(&pid, clpcctrl_args[0], NULL, NULL, clpcctrl_args, environ);
waitpid(pid, &spawn_ret, 0);
}
static void
csw_perf_test_cleanup(void)
{
int spawn_ret, pid;
char *const clpcctrl_args[] = {"/usr/local/bin/clpcctrl", "-d", NULL};
spawn_ret = posix_spawn(&pid, clpcctrl_args[0], NULL, NULL, clpcctrl_args, environ);
waitpid(pid, &spawn_ret, 0);
}
static pthread_t
create_thread(uint32_t thread_id, uint32_t priority, bool fixpri,
void *(*start_routine)(void *))
{
int rv;
pthread_t new_thread;
struct sched_param param = { .sched_priority = (int)priority };
pthread_attr_t attr;
T_ASSERT_POSIX_ZERO(pthread_attr_init(&attr), "pthread_attr_init");
T_ASSERT_POSIX_ZERO(pthread_attr_setschedparam(&attr, ¶m),
"pthread_attr_setschedparam");
if (fixpri) {
T_ASSERT_POSIX_ZERO(pthread_attr_setschedpolicy(&attr, SCHED_RR),
"pthread_attr_setschedpolicy");
}
T_ASSERT_POSIX_ZERO(pthread_create(&new_thread, &attr, start_routine,
(void*)(uintptr_t)thread_id), "pthread_create");
T_ASSERT_POSIX_ZERO(pthread_attr_destroy(&attr), "pthread_attr_destroy");
threads[thread_id].thread = new_thread;
return new_thread;
}
/* Spin until a specified number of seconds elapses */
static void
spin_for_duration(uint32_t seconds)
{
uint64_t duration = nanos_to_abs((uint64_t)seconds * NSEC_PER_SEC);
uint64_t current_time = mach_absolute_time();
uint64_t timeout = duration + current_time;
uint64_t spin_count = 0;
while (mach_absolute_time() < timeout && atomic_load_explicit(&keep_going,
memory_order_relaxed)) {
spin_count++;
}
}
static void *
spin_thread(void *arg)
{
uint32_t thread_id = (uint32_t) arg;
char name[30] = "";
snprintf(name, sizeof(name), "spin thread %2d", thread_id);
pthread_setname_np(name);
T_ASSERT_MACH_SUCCESS(semaphore_wait_signal(semaphore, worker_sem),
"semaphore_wait_signal");
spin_for_duration(SPIN_SECS);
return NULL;
}
static void *
thread(void *arg)
{
uint32_t thread_id = (uint32_t) arg;
char name[30] = "";
snprintf(name, sizeof(name), "thread %2d", thread_id);
pthread_setname_np(name);
T_ASSERT_MACH_SUCCESS(semaphore_wait_signal(semaphore, worker_sem), "semaphore_wait");
if (threads[thread_id].measure_thread) {
for (int i = 0; i < WARMUP_ITERATIONS; i++) {
thread_switch(THREAD_NULL, SWITCH_OPTION_NONE, 0);
}
T_STAT_MEASURE_LOOP(s) {
if (thread_switch(THREAD_NULL, SWITCH_OPTION_NONE, 0)) {
T_ASSERT_FAIL("thread_switch");
}
}
atomic_store_explicit(&keep_going, 0, memory_order_relaxed);
} else {
while (atomic_load_explicit(&keep_going, memory_order_relaxed)) {
if (thread_switch(THREAD_NULL, SWITCH_OPTION_NONE, 0)) {
T_ASSERT_FAIL("thread_switch");
}
}
}
return NULL;
}
void
check_device_temperature(void)
{
char buffer[256];
FILE *pipe = popen("powerctrl Factor1", "r");
if (pipe == NULL) {
T_FAIL("Failed to check device temperature");
T_END;
}
fgets(buffer, sizeof(buffer), pipe);
if (strncmp(POWERCTRL_SUCCESS_STR, buffer, strlen(POWERCTRL_SUCCESS_STR))) {
T_PERF("temperature", 0.0, "factor", "device temperature");
} else {
T_PASS("Device temperature check pass");
T_PERF("temperature", 1.0, "factor", "device temperature");
}
pclose(pipe);
}
void
record_perfcontrol_stats(const char *sysctlname, const char *units, const char *info)
{
int data = 0;
size_t data_size = sizeof(data);
T_ASSERT_POSIX_ZERO(sysctlbyname(sysctlname,
&data, &data_size, NULL, 0),
"%s", sysctlname);
T_PERF(info, data, units, info);
}
T_GLOBAL_META(T_META_NAMESPACE("xnu.scheduler"));
/* Disable the test on MacOS for now */
T_DECL(perf_csw, "context switch performance", T_META_TAG_PERF, T_META_CHECK_LEAKS(false), T_META_ASROOT(true))
{
#if !defined(__arm64__)
T_SKIP("Not supported on Intel platforms");
return;
#endif /* !defined(__arm64__) */
check_device_temperature();
T_ATEND(csw_perf_test_cleanup);
csw_perf_test_init();
pthread_setname_np("main thread");
T_ASSERT_MACH_SUCCESS(mach_timebase_info(&timebase_info), "mach_timebase_info");
struct sched_param param = {.sched_priority = 48};
T_ASSERT_POSIX_ZERO(pthread_setschedparam(pthread_self(), SCHED_FIFO, ¶m),
"pthread_setschedparam");
T_ASSERT_MACH_SUCCESS(semaphore_create(mach_task_self(), &semaphore,
SYNC_POLICY_FIFO, 0), "semaphore_create");
T_ASSERT_MACH_SUCCESS(semaphore_create(mach_task_self(), &worker_sem,
SYNC_POLICY_FIFO, 0), "semaphore_create");
size_t ncpu_size = sizeof(g_numcpus);
T_ASSERT_POSIX_ZERO(sysctlbyname("hw.ncpu", &g_numcpus, &ncpu_size, NULL, 0),
"sysctlbyname hw.ncpu");
printf("hw.ncpu: %d\n", g_numcpus);
uint32_t n_spinners = g_numcpus - 1;
int mt_supported = 0;
size_t mt_supported_size = sizeof(mt_supported);
T_ASSERT_POSIX_ZERO(sysctlbyname("kern.monotonic.supported", &mt_supported,
&mt_supported_size, NULL, 0), "sysctlbyname kern.monotonic.supported");
for (uint32_t thread_id = 0; thread_id < n_spinners; thread_id++) {
threads[thread_id].thread = create_thread(thread_id, THR_SPINNER_PRI,
true, &spin_thread);
}
s = dt_stat_time_create("context switch time");
create_thread(n_spinners, THR_MANAGER_PRI, true, &thread);
threads[n_spinners].measure_thread = true;
create_thread(n_spinners + 1, THR_MANAGER_PRI, true, &thread);
/* Allow the context switch threads to get into sem_wait() */
for (uint32_t thread_id = 0; thread_id < n_spinners + 2; thread_id++) {
T_ASSERT_MACH_SUCCESS(semaphore_wait(worker_sem), "semaphore_wait");
}
int enable_callout_stats = 1;
size_t enable_size = sizeof(enable_callout_stats);
if (mt_supported) {
/* Enable callout stat collection */
T_ASSERT_POSIX_ZERO(sysctlbyname("kern.perfcontrol_callout.stats_enabled",
NULL, 0, &enable_callout_stats, enable_size),
"sysctlbyname kern.perfcontrol_callout.stats_enabled");
}
T_ASSERT_MACH_SUCCESS(semaphore_signal_all(semaphore), "semaphore_signal");
for (uint32_t thread_id = 0; thread_id < n_spinners + 2; thread_id++) {
T_ASSERT_POSIX_ZERO(pthread_join(threads[thread_id].thread, NULL),
"pthread_join %d", thread_id);
}
if (mt_supported) {
record_perfcontrol_stats("kern.perfcontrol_callout.oncore_instr",
"instructions", "oncore.instructions");
record_perfcontrol_stats("kern.perfcontrol_callout.offcore_instr",
"instructions", "offcore.instructions");
record_perfcontrol_stats("kern.perfcontrol_callout.oncore_cycles",
"cycles", "oncore.cycles");
record_perfcontrol_stats("kern.perfcontrol_callout.offcore_cycles",
"cycles", "offcore.cycles");
/* Disable callout stat collection */
enable_callout_stats = 0;
T_ASSERT_POSIX_ZERO(sysctlbyname("kern.perfcontrol_callout.stats_enabled",
NULL, 0, &enable_callout_stats, enable_size),
"sysctlbyname kern.perfcontrol_callout.stats_enabled");
}
check_device_temperature();
dt_stat_finalize(s);
}