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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/sys_info.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/metrics/field_trial.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/sys_info_internal.h"
#include "base/time/time.h"
#include "build/build_config.h"
namespace base {
#if !defined(OS_ANDROID)
static const int kLowMemoryDeviceThresholdMB = 512;
bool DetectLowEndDevice() {
CommandLine* command_line = CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(switches::kEnableLowEndDeviceMode))
return true;
if (command_line->HasSwitch(switches::kDisableLowEndDeviceMode))
return false;
int ram_size_mb = SysInfo::AmountOfPhysicalMemoryMB();
return (ram_size_mb > 0 && ram_size_mb < kLowMemoryDeviceThresholdMB);
}
static LazyInstance<
internal::LazySysInfoValue<bool, DetectLowEndDevice> >::Leaky
g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
// static
bool SysInfo::IsLowEndDevice() {
const std::string group_name =
base::FieldTrialList::FindFullName("MemoryReduction");
// Low End Device Mode will be enabled if this client is assigned to
// one of those EnabledXXX groups.
if (StartsWith(group_name, "Enabled", CompareCase::SENSITIVE))
return true;
return g_lazy_low_end_device.Get().value();
}
#endif
#if (!defined(OS_MACOSX) || defined(OS_IOS)) && !defined(OS_ANDROID)
std::string SysInfo::HardwareModelName() {
return std::string();
}
#endif
// static
base::TimeDelta SysInfo::Uptime() {
// This code relies on an implementation detail of TimeTicks::Now() - that
// its return value happens to coincide with the system uptime value in
// microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
int64_t uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
return base::TimeDelta::FromMicroseconds(uptime_in_microseconds);
}
} // namespace base
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