208 lines
8.0 KiB
Plaintext
208 lines
8.0 KiB
Plaintext
/*
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* Copyright (C) 2011-2019 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "config.h"
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#import <wtf/MemoryPressureHandler.h>
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#import <mach/mach.h>
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#import <mach/task_info.h>
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#import <malloc/malloc.h>
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#import <notify.h>
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#import <wtf/Logging.h>
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#import <wtf/ResourceUsage.h>
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#import <wtf/spi/darwin/DispatchSPI.h>
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#define ENABLE_FMW_FOOTPRINT_COMPARISON 0
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extern "C" void cache_simulate_memory_warning_event(uint64_t);
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namespace WTF {
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void MemoryPressureHandler::platformReleaseMemory(Critical critical)
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{
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if (critical == Critical::Yes && (!isUnderMemoryPressure() || m_isSimulatingMemoryPressure)) {
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// libcache listens to OS memory notifications, but for process suspension
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// or memory pressure simulation, we need to prod it manually:
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cache_simulate_memory_warning_event(DISPATCH_MEMORYPRESSURE_CRITICAL);
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}
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}
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static dispatch_source_t memoryPressureEventSource = nullptr;
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static dispatch_source_t timerEventSource = nullptr;
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static int notifyTokens[3];
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// Disable memory event reception for a minimum of s_minimumHoldOffTime
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// seconds after receiving an event. Don't let events fire any sooner than
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// s_holdOffMultiplier times the last cleanup processing time. Effectively
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// this is 1 / s_holdOffMultiplier percent of the time.
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// These value seems reasonable and testing verifies that it throttles frequent
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// low memory events, greatly reducing CPU usage.
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static const Seconds s_minimumHoldOffTime { 5_s };
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#if !PLATFORM(IOS_FAMILY)
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static constexpr unsigned s_holdOffMultiplier = 20;
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#endif
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void MemoryPressureHandler::install()
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{
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if (m_installed || timerEventSource)
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return;
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dispatch_async(m_dispatchQueue.get(), ^{
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auto memoryStatusFlags = DISPATCH_MEMORYPRESSURE_NORMAL | DISPATCH_MEMORYPRESSURE_WARN | DISPATCH_MEMORYPRESSURE_CRITICAL | DISPATCH_MEMORYPRESSURE_PROC_LIMIT_WARN | DISPATCH_MEMORYPRESSURE_PROC_LIMIT_CRITICAL;
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memoryPressureEventSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MEMORYPRESSURE, 0, memoryStatusFlags, m_dispatchQueue.get());
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dispatch_source_set_event_handler(memoryPressureEventSource, ^{
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auto status = dispatch_source_get_data(memoryPressureEventSource);
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switch (status) {
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// VM pressure events.
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case DISPATCH_MEMORYPRESSURE_NORMAL:
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setUnderMemoryPressure(false);
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break;
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case DISPATCH_MEMORYPRESSURE_WARN:
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setUnderMemoryPressure(false);
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respondToMemoryPressure(Critical::No);
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break;
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case DISPATCH_MEMORYPRESSURE_CRITICAL:
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setUnderMemoryPressure(true);
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respondToMemoryPressure(Critical::Yes);
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break;
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// Process memory limit events.
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case DISPATCH_MEMORYPRESSURE_PROC_LIMIT_WARN:
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respondToMemoryPressure(Critical::No);
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break;
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case DISPATCH_MEMORYPRESSURE_PROC_LIMIT_CRITICAL:
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respondToMemoryPressure(Critical::Yes);
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break;
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}
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if (m_shouldLogMemoryMemoryPressureEvents)
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RELEASE_LOG(MemoryPressure, "Received memory pressure event %lu vm pressure %d", status, isUnderMemoryPressure());
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});
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dispatch_resume(memoryPressureEventSource);
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});
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// Allow simulation of memory pressure with "notifyutil -p org.WebKit.lowMemory"
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notify_register_dispatch("org.WebKit.lowMemory", ¬ifyTokens[0], m_dispatchQueue.get(), ^(int) {
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#if ENABLE(FMW_FOOTPRINT_COMPARISON)
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auto footprintBefore = pagesPerVMTag();
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#endif
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beginSimulatedMemoryPressure();
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WTF::releaseFastMallocFreeMemory();
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malloc_zone_pressure_relief(nullptr, 0);
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#if ENABLE(FMW_FOOTPRINT_COMPARISON)
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auto footprintAfter = pagesPerVMTag();
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logFootprintComparison(footprintBefore, footprintAfter);
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#endif
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 2 * NSEC_PER_SEC), m_dispatchQueue.get(), ^{
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endSimulatedMemoryPressure();
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});
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});
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notify_register_dispatch("org.WebKit.lowMemory.begin", ¬ifyTokens[1], m_dispatchQueue.get(), ^(int) {
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beginSimulatedMemoryPressure();
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});
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notify_register_dispatch("org.WebKit.lowMemory.end", ¬ifyTokens[2], m_dispatchQueue.get(), ^(int) {
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endSimulatedMemoryPressure();
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});
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m_installed = true;
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}
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void MemoryPressureHandler::uninstall()
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{
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if (!m_installed)
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return;
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dispatch_async(m_dispatchQueue.get(), ^{
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if (memoryPressureEventSource) {
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dispatch_source_cancel(memoryPressureEventSource);
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memoryPressureEventSource = nullptr;
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}
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if (timerEventSource) {
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dispatch_source_cancel(timerEventSource);
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timerEventSource = nullptr;
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}
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});
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m_installed = false;
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for (auto& token : notifyTokens)
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notify_cancel(token);
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}
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void MemoryPressureHandler::holdOff(Seconds seconds)
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{
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dispatch_async(m_dispatchQueue.get(), ^{
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timerEventSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, m_dispatchQueue.get());
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if (timerEventSource) {
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dispatch_set_context(timerEventSource, this);
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// FIXME: The final argument `s_minimumHoldOffTime.seconds()` seems wrong.
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// https://bugs.webkit.org/show_bug.cgi?id=183277
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dispatch_source_set_timer(timerEventSource, dispatch_time(DISPATCH_TIME_NOW, seconds.seconds() * NSEC_PER_SEC), DISPATCH_TIME_FOREVER, s_minimumHoldOffTime.seconds());
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dispatch_source_set_event_handler(timerEventSource, ^{
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if (timerEventSource) {
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dispatch_source_cancel(timerEventSource);
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timerEventSource = nullptr;
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}
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MemoryPressureHandler::singleton().install();
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});
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dispatch_resume(timerEventSource);
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}
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});
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}
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void MemoryPressureHandler::respondToMemoryPressure(Critical critical, Synchronous synchronous)
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{
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#if !PLATFORM(IOS_FAMILY)
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uninstall();
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MonotonicTime startTime = MonotonicTime::now();
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#endif
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releaseMemory(critical, synchronous);
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#if !PLATFORM(IOS_FAMILY)
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Seconds holdOffTime = (MonotonicTime::now() - startTime) * s_holdOffMultiplier;
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holdOff(std::max(holdOffTime, s_minimumHoldOffTime));
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#endif
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}
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std::optional<MemoryPressureHandler::ReliefLogger::MemoryUsage> MemoryPressureHandler::ReliefLogger::platformMemoryUsage()
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{
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task_vm_info_data_t vmInfo;
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mach_msg_type_number_t count = TASK_VM_INFO_COUNT;
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kern_return_t err = task_info(mach_task_self(), TASK_VM_INFO, (task_info_t) &vmInfo, &count);
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if (err != KERN_SUCCESS)
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return std::nullopt;
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return MemoryUsage {static_cast<size_t>(vmInfo.internal), static_cast<size_t>(vmInfo.phys_footprint)};
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}
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} // namespace WTF
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#undef LOG_CHANNEL_PREFIX
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