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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 
     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 
     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
     46 int64_t SysInfo::AmountOfPhysicalMemory() {
     47   return g_lazy_physical_memory.Get().value();
     48 }
     49 
     50 // static
     51 int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
     52   SystemMemoryInfoKB info;
     53   if (!GetSystemMemoryInfo(&info))
     54     return 0;
     55   return AmountOfAvailablePhysicalMemory(info);
     56 }
     57 
     58 // static
     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
     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