1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "dex_file_layout.h" 18 19 #include <sys/mman.h> 20 21 #include "dex_file.h" 22 #include "utils.h" 23 24 namespace art { 25 26 void DexLayoutSection::Subsection::Madvise(const DexFile* dex_file, int advice) const { 27 DCHECK(dex_file != nullptr); 28 DCHECK_LE(size_, dex_file->Size()); 29 DCHECK_LE(offset_ + size_, dex_file->Size()); 30 MadviseLargestPageAlignedRegion(dex_file->Begin() + offset_, 31 dex_file->Begin() + offset_ + size_, 32 advice); 33 } 34 35 void DexLayoutSections::Madvise(const DexFile* dex_file, MadviseState state) const { 36 // The dex file is already defaulted to random access everywhere. 37 for (const DexLayoutSection& section : sections_) { 38 switch (state) { 39 case MadviseState::kMadviseStateAtLoad: { 40 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise( 41 dex_file, 42 MADV_WILLNEED); 43 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeHot)].Madvise( 44 dex_file, 45 MADV_WILLNEED); 46 break; 47 } 48 case MadviseState::kMadviseStateFinishedLaunch: { 49 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise( 50 dex_file, 51 MADV_DONTNEED); 52 break; 53 } 54 case MadviseState::kMadviseStateFinishedTrim: { 55 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeSometimesUsed)].Madvise( 56 dex_file, 57 MADV_DONTNEED); 58 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeUsedOnce)].Madvise( 59 dex_file, 60 MADV_DONTNEED); 61 break; 62 } 63 } 64 } 65 } 66 67 std::ostream& operator<<(std::ostream& os, const DexLayoutSection& section) { 68 for (size_t i = 0; i < static_cast<size_t>(LayoutType::kLayoutTypeCount); ++i) { 69 const DexLayoutSection::Subsection& part = section.parts_[i]; 70 os << static_cast<LayoutType>(i) << "(" 71 << part.offset_ << "-" << part.offset_ + part.size_ << ") "; 72 } 73 return os; 74 } 75 76 std::ostream& operator<<(std::ostream& os, const DexLayoutSections& sections) { 77 for (size_t i = 0; i < static_cast<size_t>(DexLayoutSections::SectionType::kSectionCount); ++i) { 78 os << static_cast<DexLayoutSections::SectionType>(i) << ":" << sections.sections_[i] << "\n"; 79 } 80 return os; 81 } 82 83 } // namespace art 84
