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.
5 #include "base/sys_info.h"
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"
16 #if !defined(OS_ANDROID)
18 static const int kLowMemoryDeviceThresholdMB = 512;
20 bool DetectLowEndDevice() {
21 CommandLine* command_line = CommandLine::ForCurrentProcess();
23 if (command_line->HasSwitch(switches::kLowEndDeviceMode)) {
24 std::string string_value =
25 command_line->GetSwitchValueASCII(switches::kLowEndDeviceMode);
26 StringToInt(string_value, &int_value);
33 int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB();
34 return (ram_size_mb > 0 && ram_size_mb < kLowMemoryDeviceThresholdMB);
38 internal::LazySysInfoValue<bool, DetectLowEndDevice> >::Leaky
39 g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
42 bool SysInfo::IsLowEndDevice() {
43 return g_lazy_low_end_device.Get().value();
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;