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[chromium-blink-merge.git] / base / trace_event / process_memory_maps_dump_provider.cc
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1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/trace_event/process_memory_maps_dump_provider.h"
7 #include <cctype>
8 #include <fstream>
10 #include "base/logging.h"
11 #include "base/process/process_metrics.h"
12 #include "base/trace_event/process_memory_dump.h"
13 #include "base/trace_event/process_memory_maps.h"
15 namespace base {
16 namespace trace_event {
18 #if defined(OS_LINUX) || defined(OS_ANDROID)
19 // static
20 std::istream* ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = nullptr;
22 namespace {
24 const uint32 kMaxLineSize = 4096;
26 bool ParseSmapsHeader(std::istream* smaps,
27 ProcessMemoryMaps::VMRegion* region) {
28 // e.g., "00400000-00421000 r-xp 00000000 fc:01 1234 /foo.so\n"
29 bool res = true; // Whether this region should be appended or skipped.
30 uint64 end_addr;
31 std::string protection_flags;
32 std::string ignored;
33 *smaps >> std::hex >> region->start_address;
34 smaps->ignore(1);
35 *smaps >> std::hex >> end_addr;
36 if (end_addr > region->start_address) {
37 region->size_in_bytes = end_addr - region->start_address;
38 } else {
39 // This is not just paranoia, it can actually happen (See crbug.com/461237).
40 region->size_in_bytes = 0;
41 res = false;
44 region->protection_flags = 0;
45 *smaps >> protection_flags;
46 CHECK_EQ(4UL, protection_flags.size());
47 if (protection_flags[0] == 'r') {
48 region->protection_flags |=
49 ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
51 if (protection_flags[1] == 'w') {
52 region->protection_flags |=
53 ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
55 if (protection_flags[2] == 'x') {
56 region->protection_flags |=
57 ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
59 *smaps >> ignored; // Ignore mapped file offset.
60 *smaps >> ignored; // Ignore device maj-min (fc:01 in the example above).
61 *smaps >> ignored; // Ignore inode number (1234 in the example above).
63 while (smaps->peek() == ' ')
64 smaps->ignore(1);
65 char mapped_file[kMaxLineSize];
66 smaps->getline(mapped_file, sizeof(mapped_file));
67 region->mapped_file = mapped_file;
69 return res;
72 uint64 ReadCounterBytes(std::istream* smaps) {
73 uint64 counter_value = 0;
74 *smaps >> std::dec >> counter_value;
75 return counter_value * 1024;
78 uint32 ParseSmapsCounter(std::istream* smaps,
79 ProcessMemoryMaps::VMRegion* region) {
80 // A smaps counter lines looks as follows: "RSS: 0 Kb\n"
81 uint32 res = 1;
82 std::string counter_name;
83 *smaps >> counter_name;
85 // TODO(primiano): "Swap" should also be accounted as resident. Check
86 // whether Rss isn't already counting swapped and fix below if that is
87 // the case.
88 if (counter_name == "Pss:") {
89 region->byte_stats_proportional_resident = ReadCounterBytes(smaps);
90 } else if (counter_name == "Private_Dirty:") {
91 region->byte_stats_private_dirty_resident = ReadCounterBytes(smaps);
92 } else if (counter_name == "Private_Clean:") {
93 region->byte_stats_private_clean_resident = ReadCounterBytes(smaps);
94 } else if (counter_name == "Shared_Dirty:") {
95 region->byte_stats_shared_dirty_resident = ReadCounterBytes(smaps);
96 } else if (counter_name == "Shared_Clean:") {
97 region->byte_stats_shared_clean_resident = ReadCounterBytes(smaps);
98 } else if (counter_name == "Swap:") {
99 region->byte_stats_swapped = ReadCounterBytes(smaps);
100 } else {
101 res = 0;
104 #ifndef NDEBUG
105 // Paranoid check against changes of the Kernel /proc interface.
106 if (res) {
107 std::string unit;
108 *smaps >> unit;
109 DCHECK_EQ("kB", unit);
111 #endif
113 smaps->ignore(kMaxLineSize, '\n');
115 return res;
118 uint32 ReadLinuxProcSmapsFile(std::istream* smaps, ProcessMemoryMaps* pmm) {
119 if (!smaps->good())
120 return 0;
122 const uint32 kNumExpectedCountersPerRegion = 6;
123 uint32 counters_parsed_for_current_region = 0;
124 uint32 num_valid_regions = 0;
125 ProcessMemoryMaps::VMRegion region;
126 bool should_add_current_region = false;
127 for (;;) {
128 int next = smaps->peek();
129 if (next == std::ifstream::traits_type::eof() || next == '\n')
130 break;
131 if (isxdigit(next) && !isupper(next)) {
132 region = ProcessMemoryMaps::VMRegion();
133 counters_parsed_for_current_region = 0;
134 should_add_current_region = ParseSmapsHeader(smaps, &region);
135 } else {
136 counters_parsed_for_current_region += ParseSmapsCounter(smaps, &region);
137 DCHECK_LE(counters_parsed_for_current_region,
138 kNumExpectedCountersPerRegion);
139 if (counters_parsed_for_current_region == kNumExpectedCountersPerRegion) {
140 if (should_add_current_region) {
141 pmm->AddVMRegion(region);
142 ++num_valid_regions;
143 should_add_current_region = false;
148 return num_valid_regions;
151 } // namespace
152 #endif // defined(OS_LINUX) || defined(OS_ANDROID)
154 // static
155 ProcessMemoryMapsDumpProvider* ProcessMemoryMapsDumpProvider::GetInstance() {
156 return Singleton<ProcessMemoryMapsDumpProvider,
157 LeakySingletonTraits<ProcessMemoryMapsDumpProvider>>::get();
160 ProcessMemoryMapsDumpProvider::ProcessMemoryMapsDumpProvider() {
163 ProcessMemoryMapsDumpProvider::~ProcessMemoryMapsDumpProvider() {
166 // Called at trace dump point time. Creates a snapshot of the memory maps for
167 // the current process.
168 bool ProcessMemoryMapsDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
169 ProcessMemoryDump* pmd) {
170 // Snapshot of memory maps is not taken for light dump requests.
171 if (args.level_of_detail == MemoryDumpArgs::LEVEL_OF_DETAIL_LOW)
172 return true;
174 uint32 res = 0;
176 #if defined(OS_LINUX) || defined(OS_ANDROID)
177 if (UNLIKELY(proc_smaps_for_testing)) {
178 res = ReadLinuxProcSmapsFile(proc_smaps_for_testing, pmd->process_mmaps());
179 } else {
180 std::ifstream proc_self_smaps("/proc/self/smaps");
181 res = ReadLinuxProcSmapsFile(&proc_self_smaps, pmd->process_mmaps());
183 #else
184 LOG(ERROR) << "ProcessMemoryMaps dump provider is supported only on Linux";
185 #endif
187 if (res > 0) {
188 pmd->set_has_process_mmaps();
189 return true;
192 return false;
195 } // namespace trace_event
196 } // namespace base