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/*
* Copyright (c) 2010-2011 Apple Inc. All rights reserved.
*
* @APPLE_APACHE_LICENSE_HEADER_START@
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @APPLE_APACHE_LICENSE_HEADER_END@
*/
#include <sys/event.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#endif
#ifdef __APPLE__
#include <libkern/OSAtomic.h>
#endif
#include <assert.h>
#ifdef __ANDROID__
#include <linux/sysctl.h>
#else
#if !defined(__linux__)
#include <sys/sysctl.h>
#endif
#endif /* __ANDROID__ */
#include <stdarg.h>
#include <time.h>
#include <dispatch/dispatch.h>
#include <dispatch/private.h>
#include <bsdtests.h>
#include "dispatch_test.h"
#if defined(DISPATCH_SOURCE_TYPE_VM) && defined(NOTE_VM_PRESSURE)
#if TARGET_OS_EMBEDDED
#define ALLOC_SIZE ((size_t)(1024*1024*1ul)) // 1MB
#define NOTIFICATIONS 1
#else
#define ALLOC_SIZE ((size_t)(1024*1024*20ul)) // 20MB
#define NOTIFICATIONS 2
#endif
#define pg2mb(p) ((p) * ALLOC_SIZE/(1024*1024))
#ifdef __LP64__
#define MAXMEM ((size_t)SIZE_MAX)
#else
#define MAXMEM ((size_t)(3200ul*1024*1024)) // 3200MB
#endif
static char **pages;
static volatile int32_t handler_call_count;
static volatile int32_t page_count;
static int32_t max_page_count;
static dispatch_source_t vm_source;
static dispatch_queue_t vm_queue;
static time_t initial;
static int interval = 16;
#define log_msg(msg, ...) \
do { \
fprintf(stderr, "[%2ds] " msg, (int)(time(NULL) - initial), ##__VA_ARGS__);\
} while (0)
static bool
dispatch_test_check_evfilt_vm(void)
{
int kq = kqueue();
assert(kq != -1);
struct kevent ke = {
.filter = EVFILT_VM,
.flags = EV_ADD|EV_ENABLE|EV_RECEIPT,
.fflags = NOTE_VM_PRESSURE,
};
int r = kevent(kq, &ke, 1, &ke, 1, NULL);
close(kq);
return !(r > 0 && ke.flags & EV_ERROR && ke.data == ENOTSUP);
}
static void
cleanup(void)
{
dispatch_source_cancel(vm_source);
dispatch_release(vm_source);
dispatch_release(vm_queue);
int32_t pc = 0, i;
for (i = 0; i < max_page_count; ++i) {
if (pages[i]) {
pc++;
free(pages[i]);
}
}
if (pc) {
log_msg("Freed %ldMB\n", pg2mb(pc));
}
free(pages);
test_stop();
}
int
main(void)
{
dispatch_test_start("Dispatch VM Pressure test"); // rdar://problem/7000945
if (!dispatch_test_check_evfilt_vm()) {
test_skip("EVFILT_VM not supported");
test_stop();
return 0;
}
initial = time(NULL);
uint64_t memsize;
#ifdef __linux__
memsize = sysconf(_SC_PAGESIZE) * sysconf(_SC_PHYS_PAGES);
#else
size_t s = sizeof(memsize);
int rc = sysctlbyname("hw.memsize", &memsize, &s, NULL, 0);
assert(rc == 0);
#endif
max_page_count = MIN(memsize, MAXMEM) / ALLOC_SIZE;
pages = calloc(max_page_count, sizeof(char*));
vm_queue = dispatch_queue_create("VM Pressure", NULL);
vm_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_VM, 0,
DISPATCH_VM_PRESSURE, vm_queue);
dispatch_source_set_event_handler(vm_source, ^{
if (!page_count) {
// Too much memory pressure already to start the test
test_skip("Memory pressure at start of test");
cleanup();
}
if (OSAtomicIncrement32Barrier(&handler_call_count) != NOTIFICATIONS) {
log_msg("Ignoring vm pressure notification\n");
interval = 1;
return;
}
test_long("dispatch_source_get_data()",
dispatch_source_get_data(vm_source), NOTE_VM_PRESSURE);
int32_t i, pc = page_count + 1;
for (i = 0; i < pc && pages[i]; ++i) {
free(pages[i]);
pages[i] = NULL;
}
log_msg("Freed %ldMB\n", pg2mb(i));
});
dispatch_resume(vm_source);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC),
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
while (handler_call_count < NOTIFICATIONS &&
page_count < max_page_count) {
void *p = valloc(ALLOC_SIZE);
if (!p) {
break;
}
bzero(p, ALLOC_SIZE);
pages[page_count] = p;
if (!(OSAtomicIncrement32Barrier(&page_count) % interval)) {
log_msg("Allocated %ldMB\n", pg2mb(page_count));
usleep(200000);
}
}
if (page_count % interval) {
log_msg("Allocated %ldMB\n", pg2mb(page_count));
}
if (handler_call_count < NOTIFICATIONS) {
// Cannot allocate enough memory for test (e.g. on 32 bit)
test_skip("Cannot allocate enough memory for test");
dispatch_async(vm_queue, ^{cleanup();});
return;
}
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 2 * NSEC_PER_SEC),
vm_queue, ^{
test_long_greater_than_or_equal("VM Pressure fired",
handler_call_count, NOTIFICATIONS);
test_long_less_than("VM Pressure stopped firing",
handler_call_count, 4);
cleanup();
});
});
dispatch_main();
return 0;
}
#else //DISPATCH_SOURCE_TYPE_VM
int
main(void)
{
dispatch_test_start("Dispatch VM Pressure test"
" - No DISPATCH_SOURCE_TYPE_VM");
test_stop();
return 0;
}
#endif //DISPATCH_SOURCE_TYPE_VM
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