1 // Copyright (c) 2011 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/sys_info.h"
12 #include "base/files/file_util.h"
13 #include "base/lazy_instance.h"
14 #include "base/logging.h"
15 #include "base/numerics/safe_conversions.h"
16 #include "base/process/process_metrics.h"
17 #include "base/strings/string_number_conversions.h"
18 #include "base/sys_info_internal.h"
19 #include "build/build_config.h"
23 int64_t AmountOfMemory(int pages_name) {
24 long pages = sysconf(pages_name);
25 long page_size = sysconf(_SC_PAGESIZE);
26 if (pages == -1 || page_size == -1) {
30 return static_cast<int64_t>(pages) * page_size;
33 int64_t AmountOfPhysicalMemory() {
34 return AmountOfMemory(_SC_PHYS_PAGES);
38 base::internal::LazySysInfoValue<int64_t, AmountOfPhysicalMemory>>::Leaky
39 g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
46 int64_t SysInfo::AmountOfPhysicalMemoryImpl() {
47 return g_lazy_physical_memory.Get().value();
51 int64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
52 SystemMemoryInfoKB info;
53 if (!GetSystemMemoryInfo(&info))
55 return AmountOfAvailablePhysicalMemory(info);
59 int64_t SysInfo::AmountOfAvailablePhysicalMemory(
60 const SystemMemoryInfoKB& info) {
62 // https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
63 // The fallback logic (when there is no MemAvailable) would be more precise
64 // if we had info about zones watermarks (/proc/zoneinfo).
65 int64_t res_kb = info.available != 0
66 ? info.available - info.active_file
67 : info.free + info.reclaimable + info.inactive_file;
72 std::string SysInfo::CPUModelName() {
73 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
74 const char kCpuModelPrefix[] = "Hardware";
76 const char kCpuModelPrefix[] = "model name";
79 ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
80 DCHECK(!contents.empty());
81 if (!contents.empty()) {
82 std::istringstream iss(contents);
84 while (std::getline(iss, line)) {
85 if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
86 size_t pos = line.find(": ");
87 return line.substr(pos + 2);