Source/WebCore/page/cocoa/ResourceUsageThreadCocoa.mm - WebKit - Git at Google

 /*
  * Copyright (C) 2015-2018 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 #import "config.h"
 #import "ResourceUsageThread.h"

 #if ENABLE(RESOURCE_USAGE)

 #import "WorkerThread.h"
 #import <JavaScriptCore/GCActivityCallback.h>
 #import <JavaScriptCore/Heap.h>
 #import <JavaScriptCore/SamplingProfiler.h>
 #import <JavaScriptCore/VM.h>
 #import <mach/mach.h>
 #import <mach/vm_statistics.h>
 #import <wtf/MachSendRight.h>
 #import <wtf/ResourceUsage.h>
 #import <wtf/spi/cocoa/MachVMSPI.h>
 #import <wtf/text/StringConcatenateNumbers.h>

 namespace WebCore {

 static unsigned categoryForVMTag(unsigned tag)
 {
     switch (tag) {
     case VM_MEMORY_IOKIT:
     case VM_MEMORY_LAYERKIT:
         return MemoryCategory::Layers;
     case VM_MEMORY_IMAGEIO:
     case VM_MEMORY_CGIMAGE:
         return MemoryCategory::Images;
     case VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE:
         return MemoryCategory::IsoHeap;
     case VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR:
         return MemoryCategory::JSJIT;
     case VM_MEMORY_JAVASCRIPT_CORE:
         return MemoryCategory::Gigacage;
     case VM_MEMORY_MALLOC:
     case VM_MEMORY_MALLOC_HUGE:
     case VM_MEMORY_MALLOC_LARGE:
     case VM_MEMORY_MALLOC_SMALL:
     case VM_MEMORY_MALLOC_TINY:
     case VM_MEMORY_MALLOC_NANO:
         return MemoryCategory::LibcMalloc;
     case VM_MEMORY_TCMALLOC:
         return MemoryCategory::bmalloc;
     default:
         return MemoryCategory::Other;
     }
 }

 struct ThreadInfo {
     MachSendRight sendRight;
     float usage { 0 };
     String threadName;
     String dispatchQueueName;
 };

 static Vector<ThreadInfo> threadInfos()
 {
     thread_array_t threadList = nullptr;
     mach_msg_type_number_t threadCount = 0;
     kern_return_t kr = task_threads(mach_task_self(), &threadList, &threadCount);
     ASSERT(kr == KERN_SUCCESS);
     if (kr != KERN_SUCCESS)
         return { };

     // Since we collect thread usage without suspending threads, threads retrieved by task_threads can have gone while iterating
     // them to get usage information. If a thread has gone, a system call returns non KERN_SUCCESS, and we just ignore these threads.
     Vector<ThreadInfo> infos;
     for (mach_msg_type_number_t i = 0; i < threadCount; ++i) {
         MachSendRight sendRight = MachSendRight::adopt(threadList[i]);

         thread_info_data_t threadInfo;
         mach_msg_type_number_t threadInfoCount = THREAD_INFO_MAX;
         kr = thread_info(sendRight.sendRight(), THREAD_BASIC_INFO, reinterpret_cast<thread_info_t>(&threadInfo), &threadInfoCount);
         if (kr != KERN_SUCCESS)
             continue;

         thread_identifier_info_data_t threadIdentifierInfo;
         mach_msg_type_number_t threadIdentifierInfoCount = THREAD_IDENTIFIER_INFO_COUNT;
         kr = thread_info(sendRight.sendRight(), THREAD_IDENTIFIER_INFO, reinterpret_cast<thread_info_t>(&threadIdentifierInfo), &threadIdentifierInfoCount);
         if (kr != KERN_SUCCESS)
             continue;

         thread_extended_info_data_t threadExtendedInfo;
         mach_msg_type_number_t threadExtendedInfoCount = THREAD_EXTENDED_INFO_COUNT;
         kr = thread_info(sendRight.sendRight(), THREAD_EXTENDED_INFO, reinterpret_cast<thread_info_t>(&threadExtendedInfo), &threadExtendedInfoCount);
         if (kr != KERN_SUCCESS)
             continue;

         float usage = 0;
         auto threadBasicInfo = reinterpret_cast<thread_basic_info_t>(threadInfo);
         if (!(threadBasicInfo->flags & TH_FLAGS_IDLE))
             usage = threadBasicInfo->cpu_usage / static_cast<float>(TH_USAGE_SCALE) * 100.0;

         // FIXME: dispatch_queue_t can be destroyed concurrently while we are accessing to it here. We should not use it.
         String threadName = String(threadExtendedInfo.pth_name);
         String dispatchQueueName;
         if (threadIdentifierInfo.dispatch_qaddr) {
             dispatch_queue_t queue = *reinterpret_cast<dispatch_queue_t*>(threadIdentifierInfo.dispatch_qaddr);
             dispatchQueueName = String(dispatch_queue_get_label(queue));
         }

         infos.append(ThreadInfo { WTFMove(sendRight), usage, threadName, dispatchQueueName });
     }

     kr = vm_deallocate(mach_task_self(), (vm_offset_t)threadList, threadCount * sizeof(thread_t));
     ASSERT(kr == KERN_SUCCESS);

     return infos;
 }

 void ResourceUsageThread::platformSaveStateBeforeStarting()
 {
 #if ENABLE(SAMPLING_PROFILER)
     m_samplingProfilerMachThread = m_vm->samplingProfiler() ? m_vm->samplingProfiler()->machThread() : MACH_PORT_NULL;
 #endif
 }

 void ResourceUsageThread::platformCollectCPUData(JSC::VM*, ResourceUsageData& data)
 {
     Vector<ThreadInfo> threads = threadInfos();
     if (threads.isEmpty()) {
         ASSERT_NOT_REACHED();
         return;
     }

     // Main thread is always first.
     ASSERT(threads[0].dispatchQueueName == "com.apple.main-thread");

     mach_port_t resourceUsageMachThread = mach_thread_self();
     mach_port_t mainThreadMachThread = threads[0].sendRight.sendRight();

     HashSet<mach_port_t> knownWebKitThreads;
     {
         auto locker = holdLock(Thread::allThreadsMutex());
         for (auto* thread : Thread::allThreads(locker)) {
             mach_port_t machThread = thread->machThread();
             if (machThread != MACH_PORT_NULL)
                 knownWebKitThreads.add(machThread);
         }
     }

     HashMap<mach_port_t, String> knownWorkerThreads;
     {
         LockHolder lock(WorkerThread::workerThreadsMutex());
         for (auto* thread : WorkerThread::workerThreads(lock)) {
             // Ignore worker threads that have not been fully started yet.
             if (!thread->thread())
                 continue;
             mach_port_t machThread = thread->thread()->machThread();
             if (machThread != MACH_PORT_NULL)
                 knownWorkerThreads.set(machThread, thread->identifier().isolatedCopy());
         }
     }

     auto isDebuggerThread = [&](const ThreadInfo& thread) -> bool {
         mach_port_t machThread = thread.sendRight.sendRight();
         if (machThread == resourceUsageMachThread)
             return true;
 #if ENABLE(SAMPLING_PROFILER)
         if (machThread == m_samplingProfilerMachThread)
             return true;
 #endif
         return false;
     };

     auto isWebKitThread = [&](const ThreadInfo& thread) -> bool {
         mach_port_t machThread = thread.sendRight.sendRight();
         if (knownWebKitThreads.contains(machThread))
             return true;

         // The bmalloc scavenger thread is below WTF. Detect it by its name.
         if (thread.threadName == "JavaScriptCore bmalloc scavenger")
             return true;

         // WebKit uses many WorkQueues with common prefixes.
         if (thread.dispatchQueueName.startsWith("com.apple.IPC.")
             || thread.dispatchQueueName.startsWith("com.apple.WebKit.")
             || thread.dispatchQueueName.startsWith("org.webkit."))
             return true;

         return false;
     };

     for (auto& thread : threads) {
         data.cpu += thread.usage;
         if (isDebuggerThread(thread))
             continue;

         data.cpuExcludingDebuggerThreads += thread.usage;

         mach_port_t machThread = thread.sendRight.sendRight();
         if (machThread == mainThreadMachThread) {
             data.cpuThreads.append(ThreadCPUInfo { "Main Thread"_s, String(), thread.usage, ThreadCPUInfo::Type::Main});
             continue;
         }

         String threadIdentifier = knownWorkerThreads.get(machThread);
         bool isWorkerThread = !threadIdentifier.isEmpty();
         ThreadCPUInfo::Type type = (isWorkerThread || isWebKitThread(thread)) ? ThreadCPUInfo::Type::WebKit : ThreadCPUInfo::Type::Unknown;
         data.cpuThreads.append(ThreadCPUInfo { thread.threadName, threadIdentifier, thread.usage, type });
     }
 }

 void ResourceUsageThread::platformCollectMemoryData(JSC::VM* vm, ResourceUsageData& data)
 {
     auto tags = pagesPerVMTag();
     std::array<TagInfo, MemoryCategory::NumberOfCategories> pagesPerCategory;
     size_t totalDirtyPages = 0;
     for (unsigned i = 0; i < 256; ++i) {
         pagesPerCategory[categoryForVMTag(i)].dirty += tags[i].dirty;
         pagesPerCategory[categoryForVMTag(i)].reclaimable += tags[i].reclaimable;
         totalDirtyPages += tags[i].dirty;
     }

     for (auto& category : data.categories) {
         if (category.isSubcategory) // Only do automatic tallying for top-level categories.
             continue;
         category.dirtySize = pagesPerCategory[category.type].dirty * vmPageSize();
         category.reclaimableSize = pagesPerCategory[category.type].reclaimable * vmPageSize();
     }
     data.totalDirtySize = totalDirtyPages * vmPageSize();

     size_t currentGCHeapCapacity = vm->heap.blockBytesAllocated();
     size_t currentGCOwnedExtra = vm->heap.extraMemorySize();
     size_t currentGCOwnedExternal = vm->heap.externalMemorySize();
     ASSERT(currentGCOwnedExternal <= currentGCOwnedExtra);

     data.categories[MemoryCategory::GCHeap].dirtySize = currentGCHeapCapacity;
     data.categories[MemoryCategory::GCOwned].dirtySize = currentGCOwnedExtra - currentGCOwnedExternal;
     data.categories[MemoryCategory::GCOwned].externalSize = currentGCOwnedExternal;

     auto& mallocBucket = isFastMallocEnabled() ? data.categories[MemoryCategory::bmalloc] : data.categories[MemoryCategory::LibcMalloc];

     // First subtract memory allocated by the GC heap, since we track that separately.
     mallocBucket.dirtySize -= currentGCHeapCapacity;

     // It would be nice to assert that the "GC owned" amount is smaller than the total dirty malloc size,
     // but since the "GC owned" accounting is inexact, it's not currently feasible.
     size_t currentGCOwnedGenerallyInMalloc = currentGCOwnedExtra - currentGCOwnedExternal;
     if (currentGCOwnedGenerallyInMalloc < mallocBucket.dirtySize)
         mallocBucket.dirtySize -= currentGCOwnedGenerallyInMalloc;

     data.totalExternalSize = currentGCOwnedExternal;

     data.timeOfNextEdenCollection = data.timestamp + vm->heap.edenActivityCallback()->timeUntilFire().valueOr(Seconds(std::numeric_limits<double>::infinity()));
     data.timeOfNextFullCollection = data.timestamp + vm->heap.fullActivityCallback()->timeUntilFire().valueOr(Seconds(std::numeric_limits<double>::infinity()));
 }

 }

 #endif
	/*
	* Copyright (C) 2015-2018 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#import "config.h"
	#import "ResourceUsageThread.h"

	#if ENABLE(RESOURCE_USAGE)

	#import "WorkerThread.h"
	#import <JavaScriptCore/GCActivityCallback.h>
	#import <JavaScriptCore/Heap.h>
	#import <JavaScriptCore/SamplingProfiler.h>
	#import <JavaScriptCore/VM.h>
	#import <mach/mach.h>
	#import <mach/vm_statistics.h>
	#import <wtf/MachSendRight.h>
	#import <wtf/ResourceUsage.h>
	#import <wtf/spi/cocoa/MachVMSPI.h>
	#import <wtf/text/StringConcatenateNumbers.h>

	namespace WebCore {

	static unsigned categoryForVMTag(unsigned tag)
	{
	switch (tag) {
	case VM_MEMORY_IOKIT:
	case VM_MEMORY_LAYERKIT:
	return MemoryCategory::Layers;
	case VM_MEMORY_IMAGEIO:
	case VM_MEMORY_CGIMAGE:
	return MemoryCategory::Images;
	case VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE:
	return MemoryCategory::IsoHeap;
	case VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR:
	return MemoryCategory::JSJIT;
	case VM_MEMORY_JAVASCRIPT_CORE:
	return MemoryCategory::Gigacage;
	case VM_MEMORY_MALLOC:
	case VM_MEMORY_MALLOC_HUGE:
	case VM_MEMORY_MALLOC_LARGE:
	case VM_MEMORY_MALLOC_SMALL:
	case VM_MEMORY_MALLOC_TINY:
	case VM_MEMORY_MALLOC_NANO:
	return MemoryCategory::LibcMalloc;
	case VM_MEMORY_TCMALLOC:
	return MemoryCategory::bmalloc;
	default:
	return MemoryCategory::Other;
	}
	}

	struct ThreadInfo {
	MachSendRight sendRight;
	float usage { 0 };
	String threadName;
	String dispatchQueueName;
	};

	static Vector<ThreadInfo> threadInfos()
	{
	thread_array_t threadList = nullptr;
	mach_msg_type_number_t threadCount = 0;
	kern_return_t kr = task_threads(mach_task_self(), &threadList, &threadCount);
	ASSERT(kr == KERN_SUCCESS);
	if (kr != KERN_SUCCESS)
	return { };

	// Since we collect thread usage without suspending threads, threads retrieved by task_threads can have gone while iterating
	// them to get usage information. If a thread has gone, a system call returns non KERN_SUCCESS, and we just ignore these threads.
	Vector<ThreadInfo> infos;
	for (mach_msg_type_number_t i = 0; i < threadCount; ++i) {
	MachSendRight sendRight = MachSendRight::adopt(threadList[i]);

	thread_info_data_t threadInfo;
	mach_msg_type_number_t threadInfoCount = THREAD_INFO_MAX;
	kr = thread_info(sendRight.sendRight(), THREAD_BASIC_INFO, reinterpret_cast<thread_info_t>(&threadInfo), &threadInfoCount);
	if (kr != KERN_SUCCESS)
	continue;

	thread_identifier_info_data_t threadIdentifierInfo;
	mach_msg_type_number_t threadIdentifierInfoCount = THREAD_IDENTIFIER_INFO_COUNT;
	kr = thread_info(sendRight.sendRight(), THREAD_IDENTIFIER_INFO, reinterpret_cast<thread_info_t>(&threadIdentifierInfo), &threadIdentifierInfoCount);
	if (kr != KERN_SUCCESS)
	continue;

	thread_extended_info_data_t threadExtendedInfo;
	mach_msg_type_number_t threadExtendedInfoCount = THREAD_EXTENDED_INFO_COUNT;
	kr = thread_info(sendRight.sendRight(), THREAD_EXTENDED_INFO, reinterpret_cast<thread_info_t>(&threadExtendedInfo), &threadExtendedInfoCount);
	if (kr != KERN_SUCCESS)
	continue;

	float usage = 0;
	auto threadBasicInfo = reinterpret_cast<thread_basic_info_t>(threadInfo);
	if (!(threadBasicInfo->flags & TH_FLAGS_IDLE))
	usage = threadBasicInfo->cpu_usage / static_cast<float>(TH_USAGE_SCALE) * 100.0;

	// FIXME: dispatch_queue_t can be destroyed concurrently while we are accessing to it here. We should not use it.
	String threadName = String(threadExtendedInfo.pth_name);
	String dispatchQueueName;
	if (threadIdentifierInfo.dispatch_qaddr) {
	dispatch_queue_t queue = reinterpret_cast<dispatch_queue_t>(threadIdentifierInfo.dispatch_qaddr);
	dispatchQueueName = String(dispatch_queue_get_label(queue));
	}

	infos.append(ThreadInfo { WTFMove(sendRight), usage, threadName, dispatchQueueName });
	}

	kr = vm_deallocate(mach_task_self(), (vm_offset_t)threadList, threadCount * sizeof(thread_t));
	ASSERT(kr == KERN_SUCCESS);

	return infos;
	}

	void ResourceUsageThread::platformSaveStateBeforeStarting()
	{
	#if ENABLE(SAMPLING_PROFILER)
	m_samplingProfilerMachThread = m_vm->samplingProfiler() ? m_vm->samplingProfiler()->machThread() : MACH_PORT_NULL;
	#endif
	}

	void ResourceUsageThread::platformCollectCPUData(JSC::VM*, ResourceUsageData& data)
	{
	Vector<ThreadInfo> threads = threadInfos();
	if (threads.isEmpty()) {
	ASSERT_NOT_REACHED();
	return;
	}

	// Main thread is always first.
	ASSERT(threads[0].dispatchQueueName == "com.apple.main-thread");

	mach_port_t resourceUsageMachThread = mach_thread_self();
	mach_port_t mainThreadMachThread = threads[0].sendRight.sendRight();

	HashSet<mach_port_t> knownWebKitThreads;
	{
	auto locker = holdLock(Thread::allThreadsMutex());
	for (auto* thread : Thread::allThreads(locker)) {
	mach_port_t machThread = thread->machThread();
	if (machThread != MACH_PORT_NULL)
	knownWebKitThreads.add(machThread);
	}
	}

	HashMap<mach_port_t, String> knownWorkerThreads;
	{
	LockHolder lock(WorkerThread::workerThreadsMutex());
	for (auto* thread : WorkerThread::workerThreads(lock)) {
	// Ignore worker threads that have not been fully started yet.
	if (!thread->thread())
	continue;
	mach_port_t machThread = thread->thread()->machThread();
	if (machThread != MACH_PORT_NULL)
	knownWorkerThreads.set(machThread, thread->identifier().isolatedCopy());
	}
	}

	auto isDebuggerThread = [&](const ThreadInfo& thread) -> bool {
	mach_port_t machThread = thread.sendRight.sendRight();
	if (machThread == resourceUsageMachThread)
	return true;
	#if ENABLE(SAMPLING_PROFILER)
	if (machThread == m_samplingProfilerMachThread)
	return true;
	#endif
	return false;
	};

	auto isWebKitThread = [&](const ThreadInfo& thread) -> bool {
	mach_port_t machThread = thread.sendRight.sendRight();
	if (knownWebKitThreads.contains(machThread))
	return true;

	// The bmalloc scavenger thread is below WTF. Detect it by its name.
	if (thread.threadName == "JavaScriptCore bmalloc scavenger")
	return true;

	// WebKit uses many WorkQueues with common prefixes.
	if (thread.dispatchQueueName.startsWith("com.apple.IPC.")
	\|\| thread.dispatchQueueName.startsWith("com.apple.WebKit.")
	\|\| thread.dispatchQueueName.startsWith("org.webkit."))
	return true;

	return false;
	};

	for (auto& thread : threads) {
	data.cpu += thread.usage;
	if (isDebuggerThread(thread))
	continue;

	data.cpuExcludingDebuggerThreads += thread.usage;

	mach_port_t machThread = thread.sendRight.sendRight();
	if (machThread == mainThreadMachThread) {
	data.cpuThreads.append(ThreadCPUInfo { "Main Thread"_s, String(), thread.usage, ThreadCPUInfo::Type::Main});
	continue;
	}

	String threadIdentifier = knownWorkerThreads.get(machThread);
	bool isWorkerThread = !threadIdentifier.isEmpty();
	ThreadCPUInfo::Type type = (isWorkerThread \|\| isWebKitThread(thread)) ? ThreadCPUInfo::Type::WebKit : ThreadCPUInfo::Type::Unknown;
	data.cpuThreads.append(ThreadCPUInfo { thread.threadName, threadIdentifier, thread.usage, type });
	}
	}

	void ResourceUsageThread::platformCollectMemoryData(JSC::VM* vm, ResourceUsageData& data)
	{
	auto tags = pagesPerVMTag();
	std::array<TagInfo, MemoryCategory::NumberOfCategories> pagesPerCategory;
	size_t totalDirtyPages = 0;
	for (unsigned i = 0; i < 256; ++i) {
	pagesPerCategory[categoryForVMTag(i)].dirty += tags[i].dirty;
	pagesPerCategory[categoryForVMTag(i)].reclaimable += tags[i].reclaimable;
	totalDirtyPages += tags[i].dirty;
	}

	for (auto& category : data.categories) {
	if (category.isSubcategory) // Only do automatic tallying for top-level categories.
	continue;
	category.dirtySize = pagesPerCategory[category.type].dirty * vmPageSize();
	category.reclaimableSize = pagesPerCategory[category.type].reclaimable * vmPageSize();
	}
	data.totalDirtySize = totalDirtyPages * vmPageSize();

	size_t currentGCHeapCapacity = vm->heap.blockBytesAllocated();
	size_t currentGCOwnedExtra = vm->heap.extraMemorySize();
	size_t currentGCOwnedExternal = vm->heap.externalMemorySize();
	ASSERT(currentGCOwnedExternal <= currentGCOwnedExtra);

	data.categories[MemoryCategory::GCHeap].dirtySize = currentGCHeapCapacity;
	data.categories[MemoryCategory::GCOwned].dirtySize = currentGCOwnedExtra - currentGCOwnedExternal;
	data.categories[MemoryCategory::GCOwned].externalSize = currentGCOwnedExternal;

	auto& mallocBucket = isFastMallocEnabled() ? data.categories[MemoryCategory::bmalloc] : data.categories[MemoryCategory::LibcMalloc];

	// First subtract memory allocated by the GC heap, since we track that separately.
	mallocBucket.dirtySize -= currentGCHeapCapacity;

	// It would be nice to assert that the "GC owned" amount is smaller than the total dirty malloc size,
	// but since the "GC owned" accounting is inexact, it's not currently feasible.
	size_t currentGCOwnedGenerallyInMalloc = currentGCOwnedExtra - currentGCOwnedExternal;
	if (currentGCOwnedGenerallyInMalloc < mallocBucket.dirtySize)
	mallocBucket.dirtySize -= currentGCOwnedGenerallyInMalloc;

	data.totalExternalSize = currentGCOwnedExternal;

	data.timeOfNextEdenCollection = data.timestamp + vm->heap.edenActivityCallback()->timeUntilFire().valueOr(Seconds(std::numeric_limits<double>::infinity()));
	data.timeOfNextFullCollection = data.timestamp + vm->heap.fullActivityCallback()->timeUntilFire().valueOr(Seconds(std::numeric_limits<double>::infinity()));
	}

	}

	#endif