#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <mach/mach.h>
#include <mach/vm_map.h>
#include <darwintest.h>
#include <TargetConditionals.h>
#include <perfcheck_keys.h>
T_GLOBAL_META(
T_META_NAMESPACE("xnu.vm.perf"),
T_META_CHECK_LEAKS(false),
T_META_TAG_PERF
);
#ifdef DT_IOSMARK
#define MEMSIZE (1UL<<29)
#else
#define MEMSIZE (1UL<<27)
#endif
enum {
SOFT_FAULT,
ZERO_FILL,
NUM_TESTS
};
static int test_type;
static int num_threads;
static int ready_thread_count;
static size_t pgsize;
static size_t num_pages;
static char *memblock;
static char *memblock_share;
static dt_stat_time_t t;
static pthread_cond_t start_cvar;
static pthread_cond_t threads_ready_cvar;
static pthread_mutex_t ready_thread_count_lock;
static void map_mem_regions(void);
static void unmap_mem_regions(void);
static void fault_pages(int thread_id);
static void execute_threads(void);
static void *thread_setup(void *arg);
static void run_test(int test, int threads, int cpus);
static int get_ncpu(void);
static void map_mem_regions(void)
{
char *ptr;
volatile char val;
vm_prot_t curprot, maxprot;
memblock = (char *)mmap(NULL, MEMSIZE, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
T_QUIET; T_ASSERT_NE((void *)memblock, MAP_FAILED, "mmap");
if (test_type == SOFT_FAULT) {
for(ptr = memblock; ptr < memblock + MEMSIZE; ptr += pgsize) {
val = *ptr;
}
T_QUIET; T_ASSERT_MACH_SUCCESS(vm_remap(mach_task_self(), (vm_address_t *)&memblock_share,
MEMSIZE, 0, VM_FLAGS_ANYWHERE, mach_task_self(), (vm_address_t)memblock, FALSE,
&curprot, &maxprot, VM_INHERIT_DEFAULT), "vm_remap");
}
}
static void unmap_mem_regions(void)
{
if (test_type == SOFT_FAULT) {
T_QUIET; T_ASSERT_MACH_SUCCESS(munmap(memblock_share, MEMSIZE), "munmap");
}
T_QUIET; T_ASSERT_MACH_SUCCESS(munmap(memblock, MEMSIZE), "munmap");
}
static void fault_pages(int thread_id)
{
size_t region_len, region_start, region_end;
char *ptr, *block;
volatile char val;
region_len = num_pages / (size_t)num_threads;
region_start = region_len * (size_t)thread_id;
if((size_t)thread_id < num_pages % (size_t)num_threads) {
region_start += (size_t)thread_id;
region_len++;
}
else {
region_start += num_pages % (size_t)num_threads;
}
region_start *= pgsize;
region_len *= pgsize;
region_end = region_start + region_len;
block = (test_type == SOFT_FAULT)? memblock_share: memblock;
for(ptr = block + region_start; ptr < block + region_end; ptr += pgsize) {
val = *ptr;
}
}
static void execute_threads(void)
{
int thread_index, thread_retval;
int *thread_indices;
void *thread_retval_ptr = &thread_retval;
pthread_t* threads;
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_init(&threads_ready_cvar, NULL), "pthread_cond_init");
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_init(&start_cvar, NULL), "pthread_cond_init");
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_mutex_init(&ready_thread_count_lock, NULL), "pthread_mutex_init");
ready_thread_count = 0;
threads = (pthread_t *)malloc(sizeof(*threads) * (size_t)num_threads);
thread_indices = (int *)malloc(sizeof(*thread_indices) * (size_t)num_threads);
for(thread_index = 0; thread_index < num_threads; thread_index++) {
thread_indices[thread_index] = thread_index;
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_create(&threads[thread_index], NULL,
thread_setup, (void *)&thread_indices[thread_index]), "pthread_create");
}
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_mutex_lock(&ready_thread_count_lock), "pthread_mutex_lock");
if(ready_thread_count != num_threads) {
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_wait(&threads_ready_cvar, &ready_thread_count_lock),
"pthread_cond_wait");
}
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_mutex_unlock(&ready_thread_count_lock), "pthread_mutex_unlock");
T_STAT_MEASURE(t) {
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_broadcast(&start_cvar), "pthread_cond_broadcast");
for(thread_index = 0; thread_index < num_threads; thread_index++) {
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_join(threads[thread_index], &thread_retval_ptr),
"pthread_join");
}
};
free(threads);
free(thread_indices);
}
static void *thread_setup(void *arg)
{
int my_index = *((int *)arg);
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_mutex_lock(&ready_thread_count_lock), "pthread_mutex_lock");
ready_thread_count++;
if(ready_thread_count == num_threads) {
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_signal(&threads_ready_cvar), "pthread_cond_signal");
}
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_cond_wait(&start_cvar, &ready_thread_count_lock), "pthread_cond_wait");
T_QUIET; T_ASSERT_POSIX_SUCCESS(pthread_mutex_unlock(&ready_thread_count_lock), "pthread_mutex_unlock");
fault_pages(my_index);
return NULL;
}
static void run_test(int test, int threads, int cpus)
{
size_t sysctl_size = sizeof(pgsize);
int ret = sysctlbyname("vm.pagesize", &pgsize, &sysctl_size, NULL, 0);
T_QUIET; T_ASSERT_POSIX_SUCCESS(ret, "sysctl vm.pagesize failed");
test_type = test;
num_threads = threads;
num_pages = MEMSIZE / pgsize;
T_QUIET; T_ASSERT_LT(test_type, NUM_TESTS, "invalid test type");
T_QUIET; T_ASSERT_GT(num_threads, 0, "num_threads <= 0");
T_QUIET; T_ASSERT_GT((int)num_pages/ num_threads, 0, "num_pages/num_threads <= 0");
T_LOG("No. of cpus: %d", cpus);
T_LOG("No. of threads: %d", num_threads);
T_LOG("No. of pages: %ld", num_pages);
T_LOG("Pagesize: %ld", pgsize);
t = dt_stat_time_create("Runtime");
dt_stat_set_variable(t, kPCFailureThresholdPctVar, 50.0);
while (!dt_stat_stable(t)) {
map_mem_regions();
execute_threads();
unmap_mem_regions();
}
dt_stat_finalize(t);
T_END;
}
static int get_ncpu(void)
{
int ncpu;
size_t length = sizeof(ncpu);
T_QUIET; T_ASSERT_POSIX_SUCCESS(sysctlbyname("hw.ncpu", &ncpu, &length, NULL, 0),
"failed to query hw.ncpu");
return ncpu;
}
T_DECL(read_soft_fault,
"Read soft faults (single thread)")
{
run_test(SOFT_FAULT, 1, get_ncpu());
}
T_DECL(read_soft_fault_multithreaded,
"Read soft faults (multi-threaded)")
{
char *e;
int nthreads;
if ((e = getenv("DT_STAT_NTHREADS"))) {
nthreads = (int)strtol(e, NULL, 0);
} else {
nthreads = get_ncpu();
}
run_test(SOFT_FAULT, nthreads, get_ncpu());
}
T_DECL(zero_fill_fault,
"Zero fill faults (single thread)")
{
run_test(ZERO_FILL, 1, get_ncpu());
}
T_DECL(zero_fill_fault_multithreaded,
"Zero fill faults (multi-threaded)")
{
char *e;
int nthreads;
if ((e = getenv("DT_STAT_NTHREADS"))) {
nthreads = (int)strtol(e, NULL, 0);
} else {
nthreads = get_ncpu();
}
run_test(ZERO_FILL, nthreads, get_ncpu());
}