blob: 1fb76e5a2fa3a015f6cd2319c97ed091b7dcdc00 [file] [log] [blame]
// Copyright (c) 2013 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/process/process_metrics.h"
#include <dirent.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <utility>
#include "base/files/dir_reader_posix.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/optional.h"
#include "base/process/internal_linux.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_restrictions.h"
#include "build/build_config.h"
namespace base {
namespace {
void TrimKeyValuePairs(StringPairs* pairs) {
for (auto& pair : *pairs) {
TrimWhitespaceASCII(pair.first, TRIM_ALL, &pair.first);
TrimWhitespaceASCII(pair.second, TRIM_ALL, &pair.second);
}
}
#if defined(OS_CHROMEOS)
// Read a file with a single number string and return the number as a uint64_t.
uint64_t ReadFileToUint64(const FilePath& file) {
std::string file_contents;
if (!ReadFileToString(file, &file_contents))
return 0;
TrimWhitespaceASCII(file_contents, TRIM_ALL, &file_contents);
uint64_t file_contents_uint64 = 0;
if (!StringToUint64(file_contents, &file_contents_uint64))
return 0;
return file_contents_uint64;
}
#endif
// Read |filename| in /proc/<pid>/, split the entries into key/value pairs, and
// trim the key and value. On success, return true and write the trimmed
// key/value pairs into |key_value_pairs|.
bool ReadProcFileToTrimmedStringPairs(pid_t pid,
StringPiece filename,
StringPairs* key_value_pairs) {
std::string status_data;
{
// Synchronously reading files in /proc does not hit the disk.
ThreadRestrictions::ScopedAllowIO allow_io;
FilePath status_file = internal::GetProcPidDir(pid).Append(filename);
if (!ReadFileToString(status_file, &status_data))
return false;
}
SplitStringIntoKeyValuePairs(status_data, ':', '\n', key_value_pairs);
TrimKeyValuePairs(key_value_pairs);
return true;
}
// Read /proc/<pid>/status and return the value for |field|, or 0 on failure.
// Only works for fields in the form of "Field: value kB".
size_t ReadProcStatusAndGetFieldAsSizeT(pid_t pid, StringPiece field) {
StringPairs pairs;
if (!ReadProcFileToTrimmedStringPairs(pid, "status", &pairs))
return 0;
for (const auto& pair : pairs) {
const std::string& key = pair.first;
const std::string& value_str = pair.second;
if (key != field)
continue;
std::vector<StringPiece> split_value_str =
SplitStringPiece(value_str, " ", TRIM_WHITESPACE, SPLIT_WANT_ALL);
if (split_value_str.size() != 2 || split_value_str[1] != "kB") {
NOTREACHED();
return 0;
}
size_t value;
if (!StringToSizeT(split_value_str[0], &value)) {
NOTREACHED();
return 0;
}
return value;
}
// This can be reached if the process dies when proc is read -- in that case,
// the kernel can return missing fields.
return 0;
}
#if defined(OS_LINUX) || defined(OS_AIX)
// Read /proc/<pid>/status and look for |field|. On success, return true and
// write the value for |field| into |result|.
// Only works for fields in the form of "field : uint_value"
bool ReadProcStatusAndGetFieldAsUint64(pid_t pid,
StringPiece field,
uint64_t* result) {
StringPairs pairs;
if (!ReadProcFileToTrimmedStringPairs(pid, "status", &pairs))
return false;
for (const auto& pair : pairs) {
const std::string& key = pair.first;
const std::string& value_str = pair.second;
if (key != field)
continue;
uint64_t value;
if (!StringToUint64(value_str, &value))
return false;
*result = value;
return true;
}
return false;
}
#endif // defined(OS_LINUX) || defined(OS_AIX)
// Get the total CPU of a single process. Return value is number of jiffies
// on success or -1 on error.
int GetProcessCPU(pid_t pid) {
// Use /proc/<pid>/task to find all threads and parse their /stat file.
FilePath task_path = internal::GetProcPidDir(pid).Append("task");
DIR* dir = opendir(task_path.value().c_str());
if (!dir) {
DPLOG(ERROR) << "opendir(" << task_path.value() << ")";
return -1;
}
int total_cpu = 0;
while (struct dirent* ent = readdir(dir)) {
pid_t tid = internal::ProcDirSlotToPid(ent->d_name);
if (!tid)
continue;
// Synchronously reading files in /proc does not hit the disk.
ThreadRestrictions::ScopedAllowIO allow_io;
std::string stat;
FilePath stat_path =
task_path.Append(ent->d_name).Append(internal::kStatFile);
if (ReadFileToString(stat_path, &stat)) {
int cpu = ParseProcStatCPU(stat);
if (cpu > 0)
total_cpu += cpu;
}
}
closedir(dir);
return total_cpu;
}
#if defined(OS_CHROMEOS)
// Report on Chrome OS GEM object graphics memory. /run/debugfs_gpu is a
// bind mount into /sys/kernel/debug and synchronously reading the in-memory
// files in /sys is fast.
void ReadChromeOSGraphicsMemory(SystemMemoryInfoKB* meminfo) {
#if defined(ARCH_CPU_ARM_FAMILY)
FilePath geminfo_file("/run/debugfs_gpu/exynos_gem_objects");
#else
FilePath geminfo_file("/run/debugfs_gpu/i915_gem_objects");
#endif
std::string geminfo_data;
meminfo->gem_objects = -1;
meminfo->gem_size = -1;
if (ReadFileToString(geminfo_file, &geminfo_data)) {
int gem_objects = -1;
long long gem_size = -1;
int num_res = sscanf(geminfo_data.c_str(), "%d objects, %lld bytes",
&gem_objects, &gem_size);
if (num_res == 2) {
meminfo->gem_objects = gem_objects;
meminfo->gem_size = gem_size;
}
}
#if defined(ARCH_CPU_ARM_FAMILY)
// Incorporate Mali graphics memory if present.
FilePath mali_memory_file("/sys/class/misc/mali0/device/memory");
std::string mali_memory_data;
if (ReadFileToString(mali_memory_file, &mali_memory_data)) {
long long mali_size = -1;
int num_res = sscanf(mali_memory_data.c_str(), "%lld bytes", &mali_size);
if (num_res == 1)
meminfo->gem_size += mali_size;
}
#endif // defined(ARCH_CPU_ARM_FAMILY)
}
#endif // defined(OS_CHROMEOS)
} // namespace
// static
std::unique_ptr<ProcessMetrics> ProcessMetrics::CreateProcessMetrics(
ProcessHandle process) {
return WrapUnique(new ProcessMetrics(process));
}
// On Linux, return vsize.
size_t ProcessMetrics::GetPagefileUsage() const {
return internal::ReadProcStatsAndGetFieldAsSizeT(process_,
internal::VM_VSIZE);
}
// On Linux, return the high water mark of vsize.
size_t ProcessMetrics::GetPeakPagefileUsage() const {
return ReadProcStatusAndGetFieldAsSizeT(process_, "VmPeak") * 1024;
}
// On Linux, return RSS.
size_t ProcessMetrics::GetWorkingSetSize() const {
return internal::ReadProcStatsAndGetFieldAsSizeT(process_, internal::VM_RSS) *
getpagesize();
}
// On Linux, return the high water mark of RSS.
size_t ProcessMetrics::GetPeakWorkingSetSize() const {
return ReadProcStatusAndGetFieldAsSizeT(process_, "VmHWM") * 1024;
}
bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
size_t* shared_bytes) const {
WorkingSetKBytes ws_usage;
if (!GetWorkingSetKBytes(&ws_usage))
return false;
if (private_bytes)
*private_bytes = ws_usage.priv * 1024;
if (shared_bytes)
*shared_bytes = ws_usage.shared * 1024;
return true;
}
bool ProcessMetrics::GetWorkingSetKBytes(WorkingSetKBytes* ws_usage) const {
#if defined(OS_CHROMEOS)
if (GetWorkingSetKBytesTotmaps(ws_usage))
return true;
#endif
return GetWorkingSetKBytesStatm(ws_usage);
}
double ProcessMetrics::GetPlatformIndependentCPUUsage() {
TimeTicks time = TimeTicks::Now();
if (last_cpu_ == 0) {
// First call, just set the last values.
last_cpu_time_ = time;
last_cpu_ = GetProcessCPU(process_);
return 0.0;
}
TimeDelta time_delta = time - last_cpu_time_;
if (time_delta.is_zero()) {
NOTREACHED();
return 0.0;
}
int cpu = GetProcessCPU(process_);
// The number of jiffies in the time period. Convert to percentage.
// Note: this means this will go *over* 100 in the case where multiple threads
// are together adding to more than one CPU's worth.
TimeDelta cpu_time = internal::ClockTicksToTimeDelta(cpu);
TimeDelta last_cpu_time = internal::ClockTicksToTimeDelta(last_cpu_);
// If the number of threads running in the process has decreased since the
// last time this function was called, |last_cpu_time| will be greater than
// |cpu_time| which will result in a negative value in the below percentage
// calculation. Prevent this by clamping to 0. https://crbug.com/546565.
// This computation is known to be shaky when threads are destroyed between
// "last" and "now", but for our current purposes, it's all right.
double percentage = 0.0;
if (last_cpu_time < cpu_time) {
percentage = 100.0 * (cpu_time - last_cpu_time).InSecondsF() /
time_delta.InSecondsF();
}
last_cpu_time_ = time;
last_cpu_ = cpu;
return percentage;
}
// For the /proc/self/io file to exist, the Linux kernel must have
// CONFIG_TASK_IO_ACCOUNTING enabled.
bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {
StringPairs pairs;
if (!ReadProcFileToTrimmedStringPairs(process_, "io", &pairs))
return false;
io_counters->OtherOperationCount = 0;
io_counters->OtherTransferCount = 0;
for (const auto& pair : pairs) {
const std::string& key = pair.first;
const std::string& value_str = pair.second;
uint64_t* target_counter = nullptr;
if (key == "syscr")
target_counter = &io_counters->ReadOperationCount;
else if (key == "syscw")
target_counter = &io_counters->WriteOperationCount;
else if (key == "rchar")
target_counter = &io_counters->ReadTransferCount;
else if (key == "wchar")
target_counter = &io_counters->WriteTransferCount;
if (!target_counter)
continue;
bool converted = StringToUint64(value_str, target_counter);
DCHECK(converted);
}
return true;
}
#if defined(OS_LINUX) || defined(OS_ANDROID)
uint64_t ProcessMetrics::GetVmSwapBytes() const {
return ReadProcStatusAndGetFieldAsSizeT(process_, "VmSwap") * 1024;
}
#endif // defined(OS_LINUX) || defined(OS_ANDROID)
#if defined(OS_LINUX) || defined(OS_ANDROID)
bool ProcessMetrics::GetPageFaultCounts(PageFaultCounts* counts) const {
// We are not using internal::ReadStatsFileAndGetFieldAsInt64(), since it
// would read the file twice, and return inconsistent numbers.
std::string stats_data;
if (!internal::ReadProcStats(process_, &stats_data))
return false;
std::vector<std::string> proc_stats;
if (!internal::ParseProcStats(stats_data, &proc_stats))
return false;
counts->minor =
internal::GetProcStatsFieldAsInt64(proc_stats, internal::VM_MINFLT);
counts->major =
internal::GetProcStatsFieldAsInt64(proc_stats, internal::VM_MAJFLT);
return true;
}
#endif // defined(OS_LINUX) || defined(OS_ANDROID)
#if defined(OS_LINUX) || defined(OS_AIX)
int ProcessMetrics::GetOpenFdCount() const {
// Use /proc/<pid>/fd to count the number of entries there.
FilePath fd_path = internal::GetProcPidDir(process_).Append("fd");
DirReaderPosix dir_reader(fd_path.value().c_str());
if (!dir_reader.IsValid())
return -1;
int total_count = 0;
for (; dir_reader.Next(); ) {
const char* name = dir_reader.name();
if (strcmp(name, ".") != 0 && strcmp(name, "..") != 0)
++total_count;
}
return total_count;
}
int ProcessMetrics::GetOpenFdSoftLimit() const {
// Use /proc/<pid>/limits to read the open fd limit.
FilePath fd_path = internal::GetProcPidDir(process_).Append("limits");
std::string limits_contents;
if (!ReadFileToString(fd_path, &limits_contents))
return -1;
for (const auto& line : SplitStringPiece(
limits_contents, "\n", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY)) {
if (!line.starts_with("Max open files"))
continue;
auto tokens =
SplitStringPiece(line, " ", TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
if (tokens.size() > 3) {
int limit = -1;
if (!StringToInt(tokens[3], &limit))
return -1;
return limit;
}
}
return -1;
}
#endif // defined(OS_LINUX) || defined(OS_AIX)
ProcessMetrics::ProcessMetrics(ProcessHandle process)
: process_(process),
last_system_time_(0),
#if defined(OS_LINUX) || defined(OS_AIX)
last_absolute_idle_wakeups_(0),
#endif
last_cpu_(0) {
}
#if defined(OS_CHROMEOS)
// Private, Shared and Proportional working set sizes are obtained from
// /proc/<pid>/totmaps
bool ProcessMetrics::GetWorkingSetKBytesTotmaps(WorkingSetKBytes *ws_usage)
const {
// The format of /proc/<pid>/totmaps is:
//
// Rss: 6120 kB
// Pss: 3335 kB
// Shared_Clean: 1008 kB
// Shared_Dirty: 4012 kB
// Private_Clean: 4 kB
// Private_Dirty: 1096 kB
// Referenced: XXX kB
// Anonymous: XXX kB
// AnonHugePages: XXX kB
// Swap: XXX kB
// Locked: XXX kB
const size_t kPssIndex = (1 * 3) + 1;
const size_t kPrivate_CleanIndex = (4 * 3) + 1;
const size_t kPrivate_DirtyIndex = (5 * 3) + 1;
const size_t kSwapIndex = (9 * 3) + 1;
std::string totmaps_data;
{
FilePath totmaps_file = internal::GetProcPidDir(process_).Append("totmaps");
ThreadRestrictions::ScopedAllowIO allow_io;
bool ret = ReadFileToString(totmaps_file, &totmaps_data);
if (!ret || totmaps_data.length() == 0)
return false;
}
std::vector<std::string> totmaps_fields = SplitString(
totmaps_data, kWhitespaceASCII, KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY);
DCHECK_EQ("Pss:", totmaps_fields[kPssIndex-1]);
DCHECK_EQ("Private_Clean:", totmaps_fields[kPrivate_CleanIndex - 1]);
DCHECK_EQ("Private_Dirty:", totmaps_fields[kPrivate_DirtyIndex - 1]);
DCHECK_EQ("Swap:", totmaps_fields[kSwapIndex-1]);
int pss = 0;
int private_clean = 0;
int private_dirty = 0;
int swap = 0;
bool ret = true;
ret &= StringToInt(totmaps_fields[kPssIndex], &pss);
ret &= StringToInt(totmaps_fields[kPrivate_CleanIndex], &private_clean);
ret &= StringToInt(totmaps_fields[kPrivate_DirtyIndex], &private_dirty);
ret &= StringToInt(totmaps_fields[kSwapIndex], &swap);
// On ChromeOS, swap goes to zram. Count this as private / shared, as
// increased swap decreases available RAM to user processes, which would
// otherwise create surprising results.
ws_usage->priv = private_clean + private_dirty + swap;
ws_usage->shared = pss + swap;
ws_usage->shareable = 0;
ws_usage->swapped = swap;
return ret;
}
#endif
// Private and Shared working set sizes are obtained from /proc/<pid>/statm.
bool ProcessMetrics::GetWorkingSetKBytesStatm(WorkingSetKBytes* ws_usage)
const {
// Use statm instead of smaps because smaps is:
// a) Large and slow to parse.
// b) Unavailable in the SUID sandbox.
// First get the page size, since everything is measured in pages.
// For details, see: man 5 proc.
const int page_size_kb = getpagesize() / 1024;
if (page_size_kb <= 0)
return false;
std::string statm;
{
FilePath statm_file = internal::GetProcPidDir(process_).Append("statm");
// Synchronously reading files in /proc does not hit the disk.
ThreadRestrictions::ScopedAllowIO allow_io;
bool ret = ReadFileToString(statm_file, &statm);
if (!ret || statm.length() == 0)
return false;
}
std::vector<StringPiece> statm_vec =
SplitStringPiece(statm, " ", TRIM_WHITESPACE, SPLIT_WANT_ALL);
if (statm_vec.size() != 7)
return false; // Not the expected format.
int statm_rss;
int statm_shared;
bool ret = true;
ret &= StringToInt(statm_vec[1], &statm_rss);
ret &= StringToInt(statm_vec[2], &statm_shared);
ws_usage->priv = (statm_rss - statm_shared) * page_size_kb;
ws_usage->shared = statm_shared * page_size_kb;
// Sharable is not calculated, as it does not provide interesting data.
ws_usage->shareable = 0;
#if defined(OS_CHROMEOS)
// Can't get swapped memory from statm.
ws_usage->swapped = 0;
#endif
return ret;
}
size_t GetSystemCommitCharge() {
SystemMemoryInfoKB meminfo;
if (!GetSystemMemoryInfo(&meminfo))
return 0;
return meminfo.total - meminfo.free - meminfo.buffers - meminfo.cached;
}
int ParseProcStatCPU(StringPiece input) {
// |input| may be empty if the process disappeared somehow.
// e.g. http://crbug.com/145811.
if (input.empty())
return -1;
size_t start = input.find_last_of(')');
if (start == input.npos)
return -1;
// Number of spaces remaining until reaching utime's index starting after the
// last ')'.
int num_spaces_remaining = internal::VM_UTIME - 1;
size_t i = start;
while ((i = input.find(' ', i + 1)) != input.npos) {
// Validate the assumption that there aren't any contiguous spaces
// in |input| before utime.
DCHECK_NE(input[i - 1], ' ');
if (--num_spaces_remaining == 0) {
int utime = 0;
int stime = 0;
if (sscanf(&input.data()[i], "%d %d", &utime, &stime) != 2)
return -1;
return utime + stime;
}
}
return -1;
}
int GetNumberOfThreads(ProcessHandle process) {
return internal::ReadProcStatsAndGetFieldAsInt64(process,
internal::VM_NUMTHREADS);
}
const char kProcSelfExe[] = "/proc/self/exe";
namespace {
// The format of /proc/diskstats is:
// Device major number
// Device minor number
// Device name
// Field 1 -- # of reads completed
// This is the total number of reads completed successfully.
// Field 2 -- # of reads merged, field 6 -- # of writes merged
// Reads and writes which are adjacent to each other may be merged for
// efficiency. Thus two 4K reads may become one 8K read before it is
// ultimately handed to the disk, and so it will be counted (and queued)
// as only one I/O. This field lets you know how often this was done.
// Field 3 -- # of sectors read
// This is the total number of sectors read successfully.
// Field 4 -- # of milliseconds spent reading
// This is the total number of milliseconds spent by all reads (as
// measured from __make_request() to end_that_request_last()).
// Field 5 -- # of writes completed
// This is the total number of writes completed successfully.
// Field 6 -- # of writes merged
// See the description of field 2.
// Field 7 -- # of sectors written
// This is the total number of sectors written successfully.
// Field 8 -- # of milliseconds spent writing
// This is the total number of milliseconds spent by all writes (as
// measured from __make_request() to end_that_request_last()).
// Field 9 -- # of I/Os currently in progress
// The only field that should go to zero. Incremented as requests are
// given to appropriate struct request_queue and decremented as they
// finish.
// Field 10 -- # of milliseconds spent doing I/Os
// This field increases so long as field 9 is nonzero.
// Field 11 -- weighted # of milliseconds spent doing I/Os
// This field is incremented at each I/O start, I/O completion, I/O
// merge, or read of these stats by the number of I/Os in progress
// (field 9) times the number of milliseconds spent doing I/O since the
// last update of this field. This can provide an easy measure of both
// I/O completion time and the backlog that may be accumulating.
const size_t kDiskDriveName = 2;
const size_t kDiskReads = 3;
const size_t kDiskReadsMerged = 4;
const size_t kDiskSectorsRead = 5;
const size_t kDiskReadTime = 6;
const size_t kDiskWrites = 7;
const size_t kDiskWritesMerged = 8;
const size_t kDiskSectorsWritten = 9;
const size_t kDiskWriteTime = 10;
const size_t kDiskIO = 11;
const size_t kDiskIOTime = 12;
const size_t kDiskWeightedIOTime = 13;
} // namespace
std::unique_ptr<DictionaryValue> SystemMemoryInfoKB::ToValue() const {
auto res = std::make_unique<DictionaryValue>();
res->SetInteger("total", total);
res->SetInteger("free", free);
res->SetInteger("available", available);
res->SetInteger("buffers", buffers);
res->SetInteger("cached", cached);
res->SetInteger("active_anon", active_anon);
res->SetInteger("inactive_anon", inactive_anon);
res->SetInteger("active_file", active_file);
res->SetInteger("inactive_file", inactive_file);
res->SetInteger("swap_total", swap_total);
res->SetInteger("swap_free", swap_free);
res->SetInteger("swap_used", swap_total - swap_free);
res->SetInteger("dirty", dirty);
res->SetInteger("reclaimable", reclaimable);
#ifdef OS_CHROMEOS
res->SetInteger("shmem", shmem);
res->SetInteger("slab", slab);
res->SetInteger("gem_objects", gem_objects);
res->SetInteger("gem_size", gem_size);
#endif
return res;
}
bool ParseProcMeminfo(StringPiece meminfo_data, SystemMemoryInfoKB* meminfo) {
// The format of /proc/meminfo is:
//
// MemTotal: 8235324 kB
// MemFree: 1628304 kB
// Buffers: 429596 kB
// Cached: 4728232 kB
// ...
// There is no guarantee on the ordering or position
// though it doesn't appear to change very often
// As a basic sanity check at the end, make sure the MemTotal value will be at
// least non-zero. So start off with a zero total.
meminfo->total = 0;
for (const StringPiece& line : SplitStringPiece(
meminfo_data, "\n", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY)) {
std::vector<StringPiece> tokens = SplitStringPiece(
line, kWhitespaceASCII, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
// HugePages_* only has a number and no suffix so there may not be exactly 3
// tokens.
if (tokens.size() <= 1) {
DLOG(WARNING) << "meminfo: tokens: " << tokens.size()
<< " malformed line: " << line.as_string();
continue;
}
int* target = nullptr;
if (tokens[0] == "MemTotal:")
target = &meminfo->total;
else if (tokens[0] == "MemFree:")
target = &meminfo->free;
else if (tokens[0] == "MemAvailable:")
target = &meminfo->available;
else if (tokens[0] == "Buffers:")
target = &meminfo->buffers;
else if (tokens[0] == "Cached:")
target = &meminfo->cached;
else if (tokens[0] == "Active(anon):")
target = &meminfo->active_anon;
else if (tokens[0] == "Inactive(anon):")
target = &meminfo->inactive_anon;
else if (tokens[0] == "Active(file):")
target = &meminfo->active_file;
else if (tokens[0] == "Inactive(file):")
target = &meminfo->inactive_file;
else if (tokens[0] == "SwapTotal:")
target = &meminfo->swap_total;
else if (tokens[0] == "SwapFree:")
target = &meminfo->swap_free;
else if (tokens[0] == "Dirty:")
target = &meminfo->dirty;
else if (tokens[0] == "SReclaimable:")
target = &meminfo->reclaimable;
#if defined(OS_CHROMEOS)
// Chrome OS has a tweaked kernel that allows querying Shmem, which is
// usually video memory otherwise invisible to the OS.
else if (tokens[0] == "Shmem:")
target = &meminfo->shmem;
else if (tokens[0] == "Slab:")
target = &meminfo->slab;
#endif
if (target)
StringToInt(tokens[1], target);
}
// Make sure the MemTotal is valid.
return meminfo->total > 0;
}
bool ParseProcVmstat(StringPiece vmstat_data, VmStatInfo* vmstat) {
// The format of /proc/vmstat is:
//
// nr_free_pages 299878
// nr_inactive_anon 239863
// nr_active_anon 1318966
// nr_inactive_file 2015629
// ...
//
// Iterate through the whole file because the position of the
// fields are dependent on the kernel version and configuration.
bool has_pswpin = false;
bool has_pswpout = false;
bool has_pgmajfault = false;
for (const StringPiece& line : SplitStringPiece(
vmstat_data, "\n", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY)) {
std::vector<StringPiece> tokens = SplitStringPiece(
line, " ", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY);
if (tokens.size() != 2)
continue;
uint64_t val;
if (!StringToUint64(tokens[1], &val))
continue;
if (tokens[0] == "pswpin") {
vmstat->pswpin = val;
DCHECK(!has_pswpin);
has_pswpin = true;
} else if (tokens[0] == "pswpout") {
vmstat->pswpout = val;
DCHECK(!has_pswpout);
has_pswpout = true;
} else if (tokens[0] == "pgmajfault") {
vmstat->pgmajfault = val;
DCHECK(!has_pgmajfault);
has_pgmajfault = true;
}
if (has_pswpin && has_pswpout && has_pgmajfault)
return true;
}
return false;
}
bool GetSystemMemoryInfo(SystemMemoryInfoKB* meminfo) {
// Synchronously reading files in /proc and /sys are safe.
ThreadRestrictions::ScopedAllowIO allow_io;
// Used memory is: total - free - buffers - caches
FilePath meminfo_file("/proc/meminfo");
std::string meminfo_data;
if (!ReadFileToString(meminfo_file, &meminfo_data)) {
DLOG(WARNING) << "Failed to open " << meminfo_file.value();
return false;
}
if (!ParseProcMeminfo(meminfo_data, meminfo)) {
DLOG(WARNING) << "Failed to parse " << meminfo_file.value();
return false;
}
#if defined(OS_CHROMEOS)
ReadChromeOSGraphicsMemory(meminfo);
#endif
return true;
}
std::unique_ptr<DictionaryValue> VmStatInfo::ToValue() const {
auto res = std::make_unique<DictionaryValue>();
res->SetInteger("pswpin", pswpin);
res->SetInteger("pswpout", pswpout);
res->SetInteger("pgmajfault", pgmajfault);
return res;
}
bool GetVmStatInfo(VmStatInfo* vmstat) {
// Synchronously reading files in /proc and /sys are safe.
ThreadRestrictions::ScopedAllowIO allow_io;
FilePath vmstat_file("/proc/vmstat");
std::string vmstat_data;
if (!ReadFileToString(vmstat_file, &vmstat_data)) {
DLOG(WARNING) << "Failed to open " << vmstat_file.value();
return false;
}
if (!ParseProcVmstat(vmstat_data, vmstat)) {
DLOG(WARNING) << "Failed to parse " << vmstat_file.value();
return false;
}
return true;
}
SystemDiskInfo::SystemDiskInfo() {
reads = 0;
reads_merged = 0;
sectors_read = 0;
read_time = 0;
writes = 0;
writes_merged = 0;
sectors_written = 0;
write_time = 0;
io = 0;
io_time = 0;
weighted_io_time = 0;
}
SystemDiskInfo::SystemDiskInfo(const SystemDiskInfo& other) = default;
std::unique_ptr<Value> SystemDiskInfo::ToValue() const {
auto res = std::make_unique<DictionaryValue>();
// Write out uint64_t variables as doubles.
// Note: this may discard some precision, but for JS there's no other option.
res->SetDouble("reads", static_cast<double>(reads));
res->SetDouble("reads_merged", static_cast<double>(reads_merged));
res->SetDouble("sectors_read", static_cast<double>(sectors_read));
res->SetDouble("read_time", static_cast<double>(read_time));
res->SetDouble("writes", static_cast<double>(writes));
res->SetDouble("writes_merged", static_cast<double>(writes_merged));
res->SetDouble("sectors_written", static_cast<double>(sectors_written));
res->SetDouble("write_time", static_cast<double>(write_time));
res->SetDouble("io", static_cast<double>(io));
res->SetDouble("io_time", static_cast<double>(io_time));
res->SetDouble("weighted_io_time", static_cast<double>(weighted_io_time));
return std::move(res);
}
bool IsValidDiskName(StringPiece candidate) {
if (candidate.length() < 3)
return false;
if (candidate[1] == 'd' &&
(candidate[0] == 'h' || candidate[0] == 's' || candidate[0] == 'v')) {
// [hsv]d[a-z]+ case
for (size_t i = 2; i < candidate.length(); ++i) {
if (!islower(candidate[i]))
return false;
}
return true;
}
const char kMMCName[] = "mmcblk";
if (!candidate.starts_with(kMMCName))
return false;
// mmcblk[0-9]+ case
for (size_t i = strlen(kMMCName); i < candidate.length(); ++i) {
if (!isdigit(candidate[i]))
return false;
}
return true;
}
bool GetSystemDiskInfo(SystemDiskInfo* diskinfo) {
// Synchronously reading files in /proc does not hit the disk.
ThreadRestrictions::ScopedAllowIO allow_io;
FilePath diskinfo_file("/proc/diskstats");
std::string diskinfo_data;
if (!ReadFileToString(diskinfo_file, &diskinfo_data)) {
DLOG(WARNING) << "Failed to open " << diskinfo_file.value();
return false;
}
std::vector<StringPiece> diskinfo_lines = SplitStringPiece(
diskinfo_data, "\n", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY);
if (diskinfo_lines.empty()) {
DLOG(WARNING) << "No lines found";
return false;
}
diskinfo->reads = 0;
diskinfo->reads_merged = 0;
diskinfo->sectors_read = 0;
diskinfo->read_time = 0;
diskinfo->writes = 0;
diskinfo->writes_merged = 0;
diskinfo->sectors_written = 0;
diskinfo->write_time = 0;
diskinfo->io = 0;
diskinfo->io_time = 0;
diskinfo->weighted_io_time = 0;
uint64_t reads = 0;
uint64_t reads_merged = 0;
uint64_t sectors_read = 0;
uint64_t read_time = 0;
uint64_t writes = 0;
uint64_t writes_merged = 0;
uint64_t sectors_written = 0;
uint64_t write_time = 0;
uint64_t io = 0;
uint64_t io_time = 0;
uint64_t weighted_io_time = 0;
for (const StringPiece& line : diskinfo_lines) {
std::vector<StringPiece> disk_fields = SplitStringPiece(
line, kWhitespaceASCII, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
// Fields may have overflowed and reset to zero.
if (!IsValidDiskName(disk_fields[kDiskDriveName].as_string()))
continue;
StringToUint64(disk_fields[kDiskReads], &reads);
StringToUint64(disk_fields[kDiskReadsMerged], &reads_merged);
StringToUint64(disk_fields[kDiskSectorsRead], &sectors_read);
StringToUint64(disk_fields[kDiskReadTime], &read_time);
StringToUint64(disk_fields[kDiskWrites], &writes);
StringToUint64(disk_fields[kDiskWritesMerged], &writes_merged);
StringToUint64(disk_fields[kDiskSectorsWritten], &sectors_written);
StringToUint64(disk_fields[kDiskWriteTime], &write_time);
StringToUint64(disk_fields[kDiskIO], &io);
StringToUint64(disk_fields[kDiskIOTime], &io_time);
StringToUint64(disk_fields[kDiskWeightedIOTime], &weighted_io_time);
diskinfo->reads += reads;
diskinfo->reads_merged += reads_merged;
diskinfo->sectors_read += sectors_read;
diskinfo->read_time += read_time;
diskinfo->writes += writes;
diskinfo->writes_merged += writes_merged;
diskinfo->sectors_written += sectors_written;
diskinfo->write_time += write_time;
diskinfo->io += io;
diskinfo->io_time += io_time;
diskinfo->weighted_io_time += weighted_io_time;
}
return true;
}
TimeDelta GetUserCpuTimeSinceBoot() {
return internal::GetUserCpuTimeSinceBoot();
}
#if defined(OS_CHROMEOS)
std::unique_ptr<Value> SwapInfo::ToValue() const {
auto res = std::make_unique<DictionaryValue>();
// Write out uint64_t variables as doubles.
// Note: this may discard some precision, but for JS there's no other option.
res->SetDouble("num_reads", static_cast<double>(num_reads));
res->SetDouble("num_writes", static_cast<double>(num_writes));
res->SetDouble("orig_data_size", static_cast<double>(orig_data_size));
res->SetDouble("compr_data_size", static_cast<double>(compr_data_size));
res->SetDouble("mem_used_total", static_cast<double>(mem_used_total));
double ratio = compr_data_size ? static_cast<double>(orig_data_size) /
static_cast<double>(compr_data_size)
: 0;
res->SetDouble("compression_ratio", ratio);
return std::move(res);
}
bool ParseZramMmStat(StringPiece mm_stat_data, SwapInfo* swap_info) {
// There are 7 columns in /sys/block/zram0/mm_stat,
// split by several spaces. The first three columns
// are orig_data_size, compr_data_size and mem_used_total.
// Example:
// 17715200 5008166 566062 0 1225715712 127 183842
//
// For more details:
// https://www.kernel.org/doc/Documentation/blockdev/zram.txt
std::vector<StringPiece> tokens = SplitStringPiece(
mm_stat_data, kWhitespaceASCII, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
if (tokens.size() < 7) {
DLOG(WARNING) << "zram mm_stat: tokens: " << tokens.size()
<< " malformed line: " << mm_stat_data.as_string();
return false;
}
if (!StringToUint64(tokens[0], &swap_info->orig_data_size))
return false;
if (!StringToUint64(tokens[1], &swap_info->compr_data_size))
return false;
if (!StringToUint64(tokens[2], &swap_info->mem_used_total))
return false;
return true;
}
bool ParseZramStat(StringPiece stat_data, SwapInfo* swap_info) {
// There are 11 columns in /sys/block/zram0/stat,
// split by several spaces. The first column is read I/Os
// and fifth column is write I/Os.
// Example:
// 299 0 2392 0 1 0 8 0 0 0 0
//
// For more details:
// https://www.kernel.org/doc/Documentation/blockdev/zram.txt
std::vector<StringPiece> tokens = SplitStringPiece(
stat_data, kWhitespaceASCII, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
if (tokens.size() < 11) {
DLOG(WARNING) << "zram stat: tokens: " << tokens.size()
<< " malformed line: " << stat_data.as_string();
return false;
}
if (!StringToUint64(tokens[0], &swap_info->num_reads))
return false;
if (!StringToUint64(tokens[4], &swap_info->num_writes))
return false;
return true;
}
namespace {
bool IgnoreZramFirstPage(uint64_t orig_data_size, SwapInfo* swap_info) {
if (orig_data_size <= 4096) {
// A single page is compressed at startup, and has a high compression
// ratio. Ignore this as it doesn't indicate any real swapping.
swap_info->orig_data_size = 0;
swap_info->num_reads = 0;
swap_info->num_writes = 0;
swap_info->compr_data_size = 0;
swap_info->mem_used_total = 0;
return true;
}
return false;
}
void ParseZramPath(SwapInfo* swap_info) {
FilePath zram_path("/sys/block/zram0");
uint64_t orig_data_size =
ReadFileToUint64(zram_path.Append("orig_data_size"));
if (IgnoreZramFirstPage(orig_data_size, swap_info))
return;
swap_info->orig_data_size = orig_data_size;
swap_info->num_reads = ReadFileToUint64(zram_path.Append("num_reads"));
swap_info->num_writes = ReadFileToUint64(zram_path.Append("num_writes"));
swap_info->compr_data_size =
ReadFileToUint64(zram_path.Append("compr_data_size"));
swap_info->mem_used_total =
ReadFileToUint64(zram_path.Append("mem_used_total"));
}
bool GetSwapInfoImpl(SwapInfo* swap_info) {
// Synchronously reading files in /sys/block/zram0 does not hit the disk.
ThreadRestrictions::ScopedAllowIO allow_io;
// Since ZRAM update, it shows the usage data in different places.
// If file "/sys/block/zram0/mm_stat" exists, use the new way, otherwise,
// use the old way.
static Optional<bool> use_new_zram_interface;
FilePath zram_mm_stat_file("/sys/block/zram0/mm_stat");
if (!use_new_zram_interface.has_value()) {
use_new_zram_interface = PathExists(zram_mm_stat_file);
}
if (!use_new_zram_interface.value()) {
ParseZramPath(swap_info);
return true;
}
std::string mm_stat_data;
if (!ReadFileToString(zram_mm_stat_file, &mm_stat_data)) {
DLOG(WARNING) << "Failed to open " << zram_mm_stat_file.value();
return false;
}
if (!ParseZramMmStat(mm_stat_data, swap_info)) {
DLOG(WARNING) << "Failed to parse " << zram_mm_stat_file.value();
return false;
}
if (IgnoreZramFirstPage(swap_info->orig_data_size, swap_info))
return true;
FilePath zram_stat_file("/sys/block/zram0/stat");
std::string stat_data;
if (!ReadFileToString(zram_stat_file, &stat_data)) {
DLOG(WARNING) << "Failed to open " << zram_stat_file.value();
return false;
}
if (!ParseZramStat(stat_data, swap_info)) {
DLOG(WARNING) << "Failed to parse " << zram_stat_file.value();
return false;
}
return true;
}
} // namespace
bool GetSwapInfo(SwapInfo* swap_info) {
if (!GetSwapInfoImpl(swap_info)) {
*swap_info = SwapInfo();
return false;
}
return true;
}
#endif // defined(OS_CHROMEOS)
#if defined(OS_LINUX) || defined(OS_AIX)
int ProcessMetrics::GetIdleWakeupsPerSecond() {
uint64_t num_switches;
static const char kSwitchStat[] = "voluntary_ctxt_switches";
return ReadProcStatusAndGetFieldAsUint64(process_, kSwitchStat, &num_switches)
? CalculateIdleWakeupsPerSecond(num_switches)
: 0;
}
#endif // defined(OS_LINUX) || defined(OS_AIX)
} // namespace base