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- // Copyright (c) 2011 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/system/sys_info.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <algorithm>
- #include <limits>
- #include <sstream>
- #include "base/check.h"
- #include "base/files/file_util.h"
- #include "base/lazy_instance.h"
- #include "base/notreached.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/process/process_metrics.h"
- #include "base/strings/string_number_conversions.h"
- #include "base/strings/string_util.h"
- #include "base/strings/stringprintf.h"
- #include "base/system/sys_info_internal.h"
- #include "build/build_config.h"
- namespace {
- uint64_t AmountOfMemory(int pages_name) {
- long pages = sysconf(pages_name);
- long page_size = sysconf(_SC_PAGESIZE);
- if (pages < 0 || page_size < 0)
- return 0;
- return static_cast<uint64_t>(pages) * static_cast<uint64_t>(page_size);
- }
- uint64_t AmountOfPhysicalMemory() {
- return AmountOfMemory(_SC_PHYS_PAGES);
- }
- base::LazyInstance<
- base::internal::LazySysInfoValue<uint64_t, AmountOfPhysicalMemory>>::Leaky
- g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
- } // namespace
- namespace base {
- // static
- uint64_t SysInfo::AmountOfPhysicalMemoryImpl() {
- return g_lazy_physical_memory.Get().value();
- }
- // static
- uint64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
- SystemMemoryInfoKB info;
- if (!GetSystemMemoryInfo(&info))
- return 0;
- return AmountOfAvailablePhysicalMemory(info);
- }
- // static
- uint64_t SysInfo::AmountOfAvailablePhysicalMemory(
- const SystemMemoryInfoKB& info) {
- // See details here:
- // https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
- // The fallback logic (when there is no MemAvailable) would be more precise
- // if we had info about zones watermarks (/proc/zoneinfo).
- int res_kb = info.available != 0
- ? std::max(info.available - info.active_file, 0)
- : info.free + info.reclaimable + info.inactive_file;
- return checked_cast<uint64_t>(res_kb) * 1024;
- }
- // static
- std::string SysInfo::CPUModelName() {
- #if BUILDFLAG(IS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
- const char kCpuModelPrefix[] = "Hardware";
- #else
- const char kCpuModelPrefix[] = "model name";
- #endif
- std::string contents;
- ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
- DCHECK(!contents.empty());
- if (!contents.empty()) {
- std::istringstream iss(contents);
- std::string line;
- while (std::getline(iss, line)) {
- if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
- size_t pos = line.find(": ");
- return line.substr(pos + 2);
- }
- }
- }
- #if defined(ARCH_CPU_ARMEL)
- // /proc/cpuinfo does not have a defined ABI and so devices may fall
- // through without a model name.
- // For ARM devices use /sys/devices/socX/soc_id
- //
- // https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-soc:
- // On many of ARM based silicon with SMCCC v1.2+ compliant firmware
- // this will contain the SOC ID appended to the family attribute
- // to ensure there is no conflict in this namespace across various
- // vendors. The format is "jep106:XXYY:ZZZZ" where XX is identity
- // code, YY is continuation code and ZZZZ is the SOC ID.
- const char kSocIdDirectory[] = "/sys/devices/soc%u";
- const char kSocIdFile[] = "/sys/devices/soc%u/soc_id";
- const char kJEP106[] = "jep106";
- // There can be multiple /sys/bus/soc/devices/socX on a system.
- // Iterate through until one with jep106:XXYY:ZZZZ is found.
- for (int soc_instance = 0;; ++soc_instance) {
- if (!PathExists(
- FilePath(base::StringPrintf(kSocIdDirectory, soc_instance))))
- break;
- std::string soc_id;
- ReadFileToString(FilePath(base::StringPrintf(kSocIdFile, soc_instance)),
- &soc_id);
- if (soc_id.find(kJEP106) == 0)
- return soc_id;
- }
- #endif
- return std::string();
- }
- #if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)
- // static
- SysInfo::HardwareInfo SysInfo::GetHardwareInfoSync() {
- static const size_t kMaxStringSize = 100u;
- HardwareInfo info;
- std::string data;
- if (ReadFileToStringWithMaxSize(
- FilePath("/sys/devices/virtual/dmi/id/sys_vendor"), &data,
- kMaxStringSize)) {
- TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.manufacturer);
- }
- if (ReadFileToStringWithMaxSize(
- FilePath("/sys/devices/virtual/dmi/id/product_name"), &data,
- kMaxStringSize)) {
- TrimWhitespaceASCII(data, TrimPositions::TRIM_ALL, &info.model);
- }
- DCHECK(IsStringUTF8(info.manufacturer));
- DCHECK(IsStringUTF8(info.model));
- return info;
- }
- #endif
- } // namespace base
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