90 lines
4.4 KiB
C++
90 lines
4.4 KiB
C++
/*
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* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
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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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#include "config.h"
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#include <wtf/MemoryFootprint.h>
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#include <algorithm>
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#include <type_traits>
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#include <windows.h>
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#include <psapi.h>
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#include <wtf/MallocPtr.h>
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#include <wtf/win/Win32Handle.h>
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namespace WTF {
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size_t memoryFootprint()
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{
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// We would like to calculate size of private working set.
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684891(v=vs.85).aspx
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// > The working set of a program is a collection of those pages in its virtual address
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// > space that have been recently referenced. It includes both shared and private data.
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// > The shared data includes pages that contain all instructions your application executes,
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// > including those in your DLLs and the system DLLs. As the working set size increases,
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// > memory demand increases.
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Win32Handle process(OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, GetCurrentProcessId()));
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if (!process.isValid())
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return 0;
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auto countSizeOfPrivateWorkingSet = [] (const PSAPI_WORKING_SET_INFORMATION& workingSets) {
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constexpr const size_t pageSize = 4 * KB;
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size_t numberOfPrivateWorkingSetPages = 0;
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for (size_t i = 0; i < workingSets.NumberOfEntries; ++i) {
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684902(v=vs.85).aspx
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PSAPI_WORKING_SET_BLOCK workingSetBlock = workingSets.WorkingSetInfo[i];
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if (!workingSetBlock.Shared)
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numberOfPrivateWorkingSetPages++;
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}
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return numberOfPrivateWorkingSetPages * pageSize;
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};
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684946(v=vs.85).aspx
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constexpr const size_t minNumberOfEntries = 16;
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constexpr const size_t sizeOfBufferOnStack = sizeof(PSAPI_WORKING_SET_INFORMATION) + minNumberOfEntries * sizeof(PSAPI_WORKING_SET_BLOCK);
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std::aligned_storage<sizeOfBufferOnStack, alignof(PSAPI_WORKING_SET_INFORMATION)>::type bufferOnStack;
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auto* workingSetsOnStack = reinterpret_cast<PSAPI_WORKING_SET_INFORMATION*>(&bufferOnStack);
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if (QueryWorkingSet(process.get(), workingSetsOnStack, sizeOfBufferOnStack))
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return countSizeOfPrivateWorkingSet(*workingSetsOnStack);
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auto updateNumberOfEntries = [&] (size_t numberOfEntries) {
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// If working set increases between first QueryWorkingSet and second QueryWorkingSet, the second one can fail.
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// At that time, we should increase numberOfEntries.
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return std::max(minNumberOfEntries, numberOfEntries + numberOfEntries / 4 + 1);
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};
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for (size_t numberOfEntries = updateNumberOfEntries(workingSetsOnStack->NumberOfEntries);;) {
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size_t workingSetSizeInBytes = sizeof(PSAPI_WORKING_SET_INFORMATION) + sizeof(PSAPI_WORKING_SET_BLOCK) * numberOfEntries;
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auto workingSets = MallocPtr<PSAPI_WORKING_SET_INFORMATION>::malloc(workingSetSizeInBytes);
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if (QueryWorkingSet(process.get(), workingSets.get(), workingSetSizeInBytes))
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return countSizeOfPrivateWorkingSet(*workingSets);
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if (GetLastError() != ERROR_BAD_LENGTH)
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return 0;
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numberOfEntries = updateNumberOfEntries(workingSets->NumberOfEntries);
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}
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}
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}
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