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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/trace_event/process_memory_maps_dump_provider.h"
#include <cctype>
#include <fstream>
#include "base/logging.h"
#include "base/process/process_metrics.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/trace_event/process_memory_maps.h"
namespace base {
namespace trace_event {
#if defined(OS_LINUX) || defined(OS_ANDROID)
// static
std::istream* ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = nullptr;
namespace {
const uint32 kMaxLineSize = 4096;
bool ParseSmapsHeader(std::istream* smaps,
ProcessMemoryMaps::VMRegion* region) {
// e.g., "00400000-00421000 r-xp 00000000 fc:01 1234 /foo.so\n"
bool res = true; // Whether this region should be appended or skipped.
uint64 end_addr;
std::string protection_flags;
std::string ignored;
*smaps >> std::hex >> region->start_address;
smaps->ignore(1);
*smaps >> std::hex >> end_addr;
if (end_addr > region->start_address) {
region->size_in_bytes = end_addr - region->start_address;
} else {
// This is not just paranoia, it can actually happen (See crbug.com/461237).
region->size_in_bytes = 0;
res = false;
}
region->protection_flags = 0;
*smaps >> protection_flags;
CHECK_EQ(4UL, protection_flags.size());
if (protection_flags[0] == 'r') {
region->protection_flags |=
ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
}
if (protection_flags[1] == 'w') {
region->protection_flags |=
ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
}
if (protection_flags[2] == 'x') {
region->protection_flags |=
ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
}
*smaps >> ignored; // Ignore mapped file offset.
*smaps >> ignored; // Ignore device maj-min (fc:01 in the example above).
*smaps >> ignored; // Ignore inode number (1234 in the example above).
while (smaps->peek() == ' ')
smaps->ignore(1);
char mapped_file[kMaxLineSize];
smaps->getline(mapped_file, sizeof(mapped_file));
region->mapped_file = mapped_file;
return res;
}
uint64 ReadCounterBytes(std::istream* smaps) {
uint64 counter_value = 0;
*smaps >> std::dec >> counter_value;
return counter_value * 1024;
}
uint32 ParseSmapsCounter(std::istream* smaps,
ProcessMemoryMaps::VMRegion* region) {
// A smaps counter lines looks as follows: "RSS: 0 Kb\n"
uint32 res = 0;
std::string counter_name;
*smaps >> counter_name;
// TODO(primiano): "Swap" should also be accounted as resident. Check
// whether Rss isn't already counting swapped and fix below if that is
// the case.
if (counter_name == "Pss:") {
region->byte_stats_proportional_resident = ReadCounterBytes(smaps);
res = 1;
} else if (counter_name == "Private_Dirty:" ||
counter_name == "Private_Clean:") {
// For Private and Shared counters keep the sum of the dirty + clean stats.
region->byte_stats_private_resident += ReadCounterBytes(smaps);
res = 1;
} else if (counter_name == "Shared_Dirty:" ||
counter_name == "Shared_Clean:") {
region->byte_stats_shared_resident += ReadCounterBytes(smaps);
res = 1;
}
#ifndef NDEBUG
// Paranoid check against changes of the Kernel /proc interface.
if (res) {
std::string unit;
*smaps >> unit;
DCHECK_EQ("kB", unit);
}
#endif
smaps->ignore(kMaxLineSize, '\n');
return res;
}
uint32 ReadLinuxProcSmapsFile(std::istream* smaps, ProcessMemoryMaps* pmm) {
if (!smaps->good())
return 0;
const uint32 kNumExpectedCountersPerRegion = 5;
uint32 counters_parsed_for_current_region = 0;
uint32 num_valid_regions = 0;
ProcessMemoryMaps::VMRegion region;
bool should_add_current_region = false;
for (;;) {
int next = smaps->peek();
if (next == std::ifstream::traits_type::eof() || next == '\n')
break;
if (isxdigit(next) && !isupper(next)) {
region = {0};
counters_parsed_for_current_region = 0;
should_add_current_region = ParseSmapsHeader(smaps, ®ion);
} else {
counters_parsed_for_current_region += ParseSmapsCounter(smaps, ®ion);
DCHECK_LE(counters_parsed_for_current_region,
kNumExpectedCountersPerRegion);
if (counters_parsed_for_current_region == kNumExpectedCountersPerRegion) {
if (should_add_current_region) {
pmm->AddVMRegion(region);
++num_valid_regions;
should_add_current_region = false;
}
}
}
}
return num_valid_regions;
}
} // namespace
#endif // defined(OS_LINUX) || defined(OS_ANDROID)
// static
ProcessMemoryMapsDumpProvider* ProcessMemoryMapsDumpProvider::GetInstance() {
return Singleton<ProcessMemoryMapsDumpProvider,
LeakySingletonTraits<ProcessMemoryMapsDumpProvider>>::get();
}
ProcessMemoryMapsDumpProvider::ProcessMemoryMapsDumpProvider() {
}
ProcessMemoryMapsDumpProvider::~ProcessMemoryMapsDumpProvider() {
}
// Called at trace dump point time. Creates a snapshot the memory maps for the
// current process.
bool ProcessMemoryMapsDumpProvider::OnMemoryDump(ProcessMemoryDump* pmd) {
uint32 res = 0;
#if defined(OS_LINUX) || defined(OS_ANDROID)
if (UNLIKELY(proc_smaps_for_testing)) {
res = ReadLinuxProcSmapsFile(proc_smaps_for_testing, pmd->process_mmaps());
} else {
std::ifstream proc_self_smaps("/proc/self/smaps");
res = ReadLinuxProcSmapsFile(&proc_self_smaps, pmd->process_mmaps());
}
#else
LOG(ERROR) << "ProcessMemoryMaps dump provider is supported only on Linux";
#endif
if (res > 0) {
pmd->set_has_process_mmaps();
return true;
}
return false;
}
} // namespace trace_event
} // namespace base
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