96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*
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* Copyright (C) 2018 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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#pragma once
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#include "VMAllocate.h"
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#include <vector>
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namespace bmalloc {
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class BulkDecommit {
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using Data = std::vector<std::pair<char*, size_t>>;
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public:
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void addEager(void* ptr, size_t size)
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{
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add(m_eager, ptr, size);
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}
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void addLazy(void* ptr, size_t size)
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{
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add(m_lazy, ptr, size);
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}
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void processEager()
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{
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process(m_eager);
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}
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void processLazy()
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{
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process(m_lazy);
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}
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private:
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void add(Data& data, void* ptr, size_t size)
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{
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char* begin = roundUpToMultipleOf(vmPageSizePhysical(), static_cast<char*>(ptr));
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char* end = roundDownToMultipleOf(vmPageSizePhysical(), static_cast<char*>(ptr) + size);
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if (begin >= end)
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return;
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data.push_back({begin, end - begin});
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}
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void process(BulkDecommit::Data& decommits)
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{
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std::sort(
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decommits.begin(), decommits.end(),
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[&] (const auto& a, const auto& b) -> bool {
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return a.first < b.first;
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});
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char* run = nullptr;
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size_t runSize = 0;
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for (unsigned i = 0; i < decommits.size(); ++i) {
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auto& pair = decommits[i];
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if (run + runSize != pair.first) {
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if (run)
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vmDeallocatePhysicalPages(run, runSize);
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run = pair.first;
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runSize = pair.second;
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} else {
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BASSERT(run);
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runSize += pair.second;
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}
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}
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if (run)
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vmDeallocatePhysicalPages(run, runSize);
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}
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Data m_eager;
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Data m_lazy;
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};
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} // namespace bmalloc
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