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
23 namespace art {
24
MadviseLargestPageAlignedRegion(const uint8_t * begin,const uint8_t * end,int advice)25 int DexLayoutSection::MadviseLargestPageAlignedRegion(const uint8_t* begin,
26 const uint8_t* end,
27 int advice) {
28 DCHECK_LE(begin, end);
29 begin = AlignUp(begin, kPageSize);
30 end = AlignDown(end, kPageSize);
31 if (begin < end) {
32 // TODO: remove the direct dependency on madvise here.
33 int result = madvise(const_cast<uint8_t*>(begin), end - begin, advice);
34 if (result != 0) {
35 PLOG(WARNING) << "madvise failed " << result;
36 }
37 return result;
38 }
39 return 0;
40 }
41
Madvise(const DexFile * dex_file,int advice) const42 void DexLayoutSection::Subsection::Madvise(const DexFile* dex_file, int advice) const {
43 DCHECK(dex_file != nullptr);
44 DCHECK_LT(start_offset_, dex_file->Size());
45 DCHECK_LE(end_offset_, dex_file->Size());
46 MadviseLargestPageAlignedRegion(dex_file->Begin() + start_offset_,
47 dex_file->Begin() + end_offset_,
48 advice);
49 }
50
Madvise(const DexFile * dex_file,MadviseState state) const51 void DexLayoutSections::Madvise(const DexFile* dex_file, MadviseState state) const {
52 // The dex file is already defaulted to random access everywhere.
53 for (const DexLayoutSection& section : sections_) {
54 switch (state) {
55 case MadviseState::kMadviseStateAtLoad: {
56 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise(
57 dex_file,
58 MADV_WILLNEED);
59 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeHot)].Madvise(
60 dex_file,
61 MADV_WILLNEED);
62 break;
63 }
64 case MadviseState::kMadviseStateFinishedLaunch: {
65 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise(
66 dex_file,
67 MADV_DONTNEED);
68 break;
69 }
70 case MadviseState::kMadviseStateFinishedTrim: {
71 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeSometimesUsed)].Madvise(
72 dex_file,
73 MADV_DONTNEED);
74 section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeUsedOnce)].Madvise(
75 dex_file,
76 MADV_DONTNEED);
77 break;
78 }
79 }
80 }
81 }
82
operator <<(std::ostream & os,const DexLayoutSection & section)83 std::ostream& operator<<(std::ostream& os, const DexLayoutSection& section) {
84 for (size_t i = 0; i < static_cast<size_t>(LayoutType::kLayoutTypeCount); ++i) {
85 const DexLayoutSection::Subsection& part = section.parts_[i];
86 os << static_cast<LayoutType>(i) << "("
87 << part.start_offset_ << "-" << part.end_offset_ << ") ";
88 }
89 return os;
90 }
91
operator <<(std::ostream & os,const DexLayoutSections & sections)92 std::ostream& operator<<(std::ostream& os, const DexLayoutSections& sections) {
93 for (size_t i = 0; i < static_cast<size_t>(DexLayoutSections::SectionType::kSectionCount); ++i) {
94 os << static_cast<DexLayoutSections::SectionType>(i) << ":" << sections.sections_[i] << "\n";
95 }
96 return os;
97 }
98
99 } // namespace art
100