1 // Copyright (c) 2012 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 "base/base_switches.h" 8 #include "base/command_line.h" 9 #include "base/lazy_instance.h" 10 #include "base/strings/string_number_conversions.h" 11 #include "base/sys_info_internal.h" 12 #include "base/time/time.h" 13 14 namespace base { 15 16 #if !defined(OS_ANDROID) 17 18 static const int kLowMemoryDeviceThresholdMB = 512; 19 20 bool DetectLowEndDevice() { 21 CommandLine* command_line = CommandLine::ForCurrentProcess(); 22 int int_value = 0; 23 if (command_line->HasSwitch(switches::kLowEndDeviceMode)) { 24 std::string string_value = 25 command_line->GetSwitchValueASCII(switches::kLowEndDeviceMode); 26 StringToInt(string_value, &int_value); 27 } 28 if (int_value == 1) 29 return true; 30 if (int_value != 2) 31 return false; 32 33 int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB(); 34 return (ram_size_mb > 0 && ram_size_mb < kLowMemoryDeviceThresholdMB); 35 } 36 37 static LazyInstance< 38 internal::LazySysInfoValue<bool, DetectLowEndDevice> >::Leaky 39 g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER; 40 41 // static 42 bool SysInfo::IsLowEndDevice() { 43 return g_lazy_low_end_device.Get().value(); 44 } 45 #endif 46 47 // static 48 int64 SysInfo::Uptime() { 49 // This code relies on an implementation detail of TimeTicks::Now() - that 50 // its return value happens to coincide with the system uptime value in 51 // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android. 52 int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue(); 53 return uptime_in_microseconds / 1000; 54 } 55 56 } // namespace base 57
