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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 <algorithm>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/sys_info_internal.h"
#include "base/time/time.h"
#include "build/build_config.h"
namespace base {
namespace {
static const int kLowMemoryDeviceThresholdMB = 512;
}
// static
int64_t SysInfo::AmountOfPhysicalMemory() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableLowEndDeviceMode)) {
return kLowMemoryDeviceThresholdMB * 1024 * 1024;
}
return AmountOfPhysicalMemoryImpl();
}
// static
int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableLowEndDeviceMode)) {
// Estimate the available memory by subtracting our memory used estimate
// from the fake |kLowMemoryDeviceThresholdMB| limit.
size_t memory_used =
AmountOfPhysicalMemoryImpl() - AmountOfAvailablePhysicalMemoryImpl();
size_t memory_limit = kLowMemoryDeviceThresholdMB * 1024 * 1024;
// std::min ensures no underflow, as |memory_used| can be > |memory_limit|.
return memory_limit - std::min(memory_used, memory_limit);
}
return AmountOfAvailablePhysicalMemoryImpl();
}
bool SysInfo::IsLowEndDevice() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableLowEndDeviceMode)) {
return true;
}
return IsLowEndDeviceImpl();
}
#if !defined(OS_ANDROID)
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::IsLowEndDeviceImpl() {
return g_lazy_low_end_device.Get().value();
}
#endif
#if !defined(OS_MACOSX) && !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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