93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dex_file_layout.h"
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#include "base/bit_utils.h"
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#include "base/mman.h"
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#include "dex_file.h"
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namespace art {
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int DexLayoutSection::MadviseLargestPageAlignedRegion(const uint8_t* begin,
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const uint8_t* end,
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int advice) {
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#ifdef _WIN32
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UNUSED(begin);
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UNUSED(end);
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UNUSED(advice);
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PLOG(WARNING) << "madvise is unsupported on Windows.";
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#else
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DCHECK_LE(begin, end);
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begin = AlignUp(begin, kPageSize);
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end = AlignDown(end, kPageSize);
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if (begin < end) {
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// TODO: remove the direct dependency on madvise here.
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int result = madvise(const_cast<uint8_t*>(begin), end - begin, advice);
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if (result != 0) {
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PLOG(WARNING) << "madvise failed " << result;
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}
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return result;
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}
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#endif
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return 0;
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}
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void DexLayoutSection::Subsection::Madvise(const DexFile* dex_file, int advice) const {
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DCHECK(dex_file != nullptr);
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DCHECK_LT(start_offset_, dex_file->Size());
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DCHECK_LE(end_offset_, dex_file->Size());
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MadviseLargestPageAlignedRegion(dex_file->Begin() + start_offset_,
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dex_file->Begin() + end_offset_,
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advice);
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}
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void DexLayoutSections::MadviseAtLoad(const DexFile* dex_file) const {
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#ifdef _WIN32
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UNUSED(dex_file);
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PLOG(WARNING) << "madvise is unsupported on Windows.";
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#else
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// The dex file is already defaulted to random access everywhere.
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for (const DexLayoutSection& section : sections_) {
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section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise(
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dex_file,
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MADV_WILLNEED);
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section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeHot)].Madvise(
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dex_file,
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MADV_WILLNEED);
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}
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#endif
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}
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std::ostream& operator<<(std::ostream& os, const DexLayoutSection& section) {
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for (size_t i = 0; i < static_cast<size_t>(LayoutType::kLayoutTypeCount); ++i) {
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const DexLayoutSection::Subsection& part = section.parts_[i];
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os << static_cast<LayoutType>(i) << "("
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<< part.start_offset_ << "-" << part.end_offset_ << ") ";
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}
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return os;
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}
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std::ostream& operator<<(std::ostream& os, const DexLayoutSections& sections) {
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for (size_t i = 0; i < static_cast<size_t>(DexLayoutSections::SectionType::kSectionCount); ++i) {
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os << static_cast<DexLayoutSections::SectionType>(i) << ":" << sections.sections_[i] << "\n";
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}
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return os;
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}
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} // namespace art
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