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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.
4 
5 #include "base/sys_info.h"
6 
7 #include <stddef.h>
8 #include <stdint.h>
9 
10 #include <limits>
11 
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"
20 
21 namespace {
22 
AmountOfMemory(int pages_name)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) {
27     NOTREACHED();
28     return 0;
29   }
30   return static_cast<int64_t>(pages) * page_size;
31 }
32 
AmountOfPhysicalMemory()33 int64_t AmountOfPhysicalMemory() {
34   return AmountOfMemory(_SC_PHYS_PAGES);
35 }
36 
37 base::LazyInstance<
38     base::internal::LazySysInfoValue<int64_t, AmountOfPhysicalMemory>>::Leaky
39     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
40 
41 }  // namespace
42 
43 namespace base {
44 
45 // static
AmountOfPhysicalMemoryImpl()46 int64_t SysInfo::AmountOfPhysicalMemoryImpl() {
47   return g_lazy_physical_memory.Get().value();
48 }
49 
50 // static
AmountOfAvailablePhysicalMemoryImpl()51 int64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
52   SystemMemoryInfoKB info;
53   if (!GetSystemMemoryInfo(&info))
54     return 0;
55   return AmountOfAvailablePhysicalMemory(info);
56 }
57 
58 // static
AmountOfAvailablePhysicalMemory(const SystemMemoryInfoKB & info)59 int64_t SysInfo::AmountOfAvailablePhysicalMemory(
60     const SystemMemoryInfoKB& info) {
61   // See details here:
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;
68   return res_kb * 1024;
69 }
70 
71 // static
CPUModelName()72 std::string SysInfo::CPUModelName() {
73 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
74   const char kCpuModelPrefix[] = "Hardware";
75 #else
76   const char kCpuModelPrefix[] = "model name";
77 #endif
78   std::string contents;
79   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
80   DCHECK(!contents.empty());
81   if (!contents.empty()) {
82     std::istringstream iss(contents);
83     std::string line;
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);
88       }
89     }
90   }
91   return std::string();
92 }
93 
94 }  // namespace base
95