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95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/sys_info.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <limits>
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#include "base/files/file_util.h"
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/process/process_metrics.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/sys_info_internal.h"
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#include "build/build_config.h"
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namespace {
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int64_t AmountOfMemory(int pages_name) {
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long pages = sysconf(pages_name);
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long page_size = sysconf(_SC_PAGESIZE);
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if (pages == -1 || page_size == -1) {
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NOTREACHED();
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return 0;
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}
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return static_cast<int64_t>(pages) * page_size;
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}
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int64_t AmountOfPhysicalMemory() {
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return AmountOfMemory(_SC_PHYS_PAGES);
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}
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base::LazyInstance<
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base::internal::LazySysInfoValue<int64_t, AmountOfPhysicalMemory>>::Leaky
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g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
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} // namespace
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namespace base {
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// static
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int64_t SysInfo::AmountOfPhysicalMemoryImpl() {
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return g_lazy_physical_memory.Get().value();
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}
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// static
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int64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
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SystemMemoryInfoKB info;
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if (!GetSystemMemoryInfo(&info))
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return 0;
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return AmountOfAvailablePhysicalMemory(info);
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}
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// static
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int64_t SysInfo::AmountOfAvailablePhysicalMemory(
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const SystemMemoryInfoKB& info) {
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// See details here:
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// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
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// The fallback logic (when there is no MemAvailable) would be more precise
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// if we had info about zones watermarks (/proc/zoneinfo).
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int64_t res_kb = info.available != 0
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? info.available - info.active_file
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: info.free + info.reclaimable + info.inactive_file;
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return res_kb * 1024;
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}
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// static
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std::string SysInfo::CPUModelName() {
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#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
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const char kCpuModelPrefix[] = "Hardware";
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#else
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const char kCpuModelPrefix[] = "model name";
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#endif
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std::string contents;
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ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
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DCHECK(!contents.empty());
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if (!contents.empty()) {
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std::istringstream iss(contents);
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std::string line;
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while (std::getline(iss, line)) {
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if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
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size_t pos = line.find(": ");
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return line.substr(pos + 2);
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}
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}
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}
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return std::string();
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}
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} // namespace base
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