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| 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/metrics/field_trial.h" | |
| 11 #include "base/strings/string_number_conversions.h" | |
| 12 #include "base/strings/string_util.h" | |
| 13 #include "base/sys_info_internal.h" | |
| 14 #include "base/time/time.h" | |
| 15 | |
| 16 namespace base { | |
| 17 | |
| 18 #if !defined(OS_ANDROID) | |
| 19 | |
| 20 static const int kLowMemoryDeviceThresholdMB = 512; | |
| 21 | |
| 22 bool DetectLowEndDevice() { | |
| 23 CommandLine* command_line = CommandLine::ForCurrentProcess(); | |
| 24 if (command_line->HasSwitch(switches::kEnableLowEndDeviceMode)) | |
| 25 return true; | |
| 26 if (command_line->HasSwitch(switches::kDisableLowEndDeviceMode)) | |
| 27 return false; | |
| 28 | |
| 29 int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB(); | |
| 30 return (ram_size_mb > 0 && ram_size_mb < kLowMemoryDeviceThresholdMB); | |
| 31 } | |
| 32 | |
| 33 static LazyInstance< | |
| 34 internal::LazySysInfoValue<bool, DetectLowEndDevice> >::Leaky | |
| 35 g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER; | |
| 36 | |
| 37 // static | |
| 38 bool SysInfo::IsLowEndDevice() { | |
| 39 const std::string group_name = | |
| 40 base::FieldTrialList::FindFullName("MemoryReduction"); | |
| 41 | |
| 42 // Low End Device Mode will be enabled if this client is assigned to | |
| 43 // one of those EnabledXXX groups. | |
| 44 if (StartsWith(group_name, "Enabled", CompareCase::SENSITIVE)) | |
| 45 return true; | |
| 46 | |
| 47 return g_lazy_low_end_device.Get().value(); | |
| 48 } | |
| 49 #endif | |
| 50 | |
| 51 #if (!defined(OS_MACOSX) || defined(OS_IOS)) && !defined(OS_ANDROID) | |
| 52 std::string SysInfo::HardwareModelName() { | |
| 53 return std::string(); | |
| 54 } | |
| 55 #endif | |
| 56 | |
| 57 // static | |
| 58 int64 SysInfo::Uptime() { | |
| 59 // This code relies on an implementation detail of TimeTicks::Now() - that | |
| 60 // its return value happens to coincide with the system uptime value in | |
| 61 // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android. | |
| 62 int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue(); | |
| 63 return uptime_in_microseconds / 1000; | |
| 64 } | |
| 65 | |
| 66 } // namespace base | |
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