【Android休眠】之Android休眠机制

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

一、休眠概述

休眠，简而言之就是设备在不需要工作的时候把一些部件、外设关掉(掉电或让它进入低功耗模式)。

为什么要休眠呢？一言以蔽之：省电。

休眠分主动休眠和被动休眠。主动休眠：比如我电脑不用了，就通过设置让系统进入休眠模式；被动休眠：系统检测到自己闲的慌，为了节约故，自己就休眠去了。

废话不叙。

二、Android休眠

休眠是内核的核心工作，而Android是基于Linux内核的，所以Android休眠和内核有着千丝万缕的联系；由于Android的特殊应用场景：移动设备，所以Android休眠和内核又有着特别的需求。

1、联系：

Android设备停止使用，系统没有什么事情可做，进入休眠状态的功能最终是由内核去实现的；每一类硬件都有自己的驱动，具体的驱动决定怎么进入休眠以及处于何种层次的休眠。比如：对于platform_device，就按照platform_driver定义的规则，在suspend调用的时候，去做上面提到的事情：

struct platform_driver { int (*probe)(struct platform_device *); int (*remove)(struct platform_device *); void (*shutdown)(struct platform_device *); int (*suspend)(struct platform_device *, pm_message_t state); int (*resume)(struct platform_device *); struct device_driver driver; const struct platform_device_id *id_table; };

2、Android的特别需求：

比如对于自己的电脑，不用让它休眠好了；但是对于我们形影不离的手机，在休眠的时候还要睁一只眼：来电了要通知你，QQ啊微信啊什么的由信息了也要通知你，所以Android在Linux内核休眠机制之上，提出了“Opportunistic Suspend”。

三、休眠实践

絮絮叨叨这么多，下面让我们切切实实体验下休眠。

1、休眠模式

休眠是分好几种模式的，不同模式实现方式、耗电量不同，以下来自Documentation/power/states.txt：

The kernel supports four power management states generically, though one is generic and the other three are dependent on platform support code to implement the low-level details for each state. This file describes each state, what they are commonly called, what ACPI state they map to, and what string to write to /sys/power/state to enter that statestate:Freeze / Low-Power Idle ACPI state:S0 String:"freeze"This state is a generic, pure software, light-weight, low-power state. It allows more energy to be saved relative to idle by freezing user space and putting all I/O devices into low-power states (possibly lower-power than available at run time), such that the processors can spend more time in their idle states. This state can be used for platforms without Standby/Suspend-to-RAM support, or it can be used in addition to Suspend-to-RAM (memory sleep) to provide reduced resume latency.State:Standby / Power-On Suspend ACPI State:S1 String:"standby"This state offers minimal, though real, power savings, while providing a very low-latency transition back to a working system. No operating state is lost (the CPU retains power), so the system easily starts up again where it left off. We try to put devices in a low-power state equivalent to D1, which also offers low power savings, but low resume latency. Not all devices support D1, and those that don't are left on. State:Suspend-to-RAM ACPI State:S3 String:"mem"This state offers significant power savings as everything in the system is put into a low-power state, except for memory, which is placed in self-refresh mode to retain its contents. System and device state is saved and kept in memory. All devices are suspended and put into D3. In many cases, all peripheral buses lose power when entering STR, so devices must be able to handle the transition back to the On state. For at least ACPI, STR requires some minimal boot-strapping code to resume the system from STR. This may be true on other platforms. State:Suspend-to-disk ACPI State:S4 String:"disk"This state offers the greatest power savings, and can be used even in the absence of low-level platform support for power management. This state operates similarly to Suspend-to-RAM, but includes a final step of writing memory contents to disk. On resume, this is read and memory is restored to its pre-suspend state.

虽说kernel支持上述四种休眠模式，但具体哪几种可用取决于你的硬件。那么怎么知道自己的Android设备支持的休眠模式呢？

答案：通过/sys/文件系统。查询支持的休眠模式可以cat文件/sys/power/state：

cat /sys/power/state freeze mem

如果我们往/sys/power/state文件echo上面的某一种模式的字符串，系统就会进入相应的休眠模式：

echo "mem" > /sys/power/state

如果你搜索过Android休眠相关的内容，在老版本的Android(4.4版本之前)会见有提到PowerManager的setPowerState()方法，该方法即是通过以上方式使系统进入休眠。但自从引入Autosleep后，就不在这么做了，setPowerState()方法也销声匿迹。

2、/sys/power/目录下文件

文件简介：

/sys/power/state：用来控制系统的Power状态。读取该文件可以获取系统支持的休眠模式，写入该文件休眠模式的一种，系统进入到指定的休眠模式。如上所示例。
/sys/power/autosleep：从Android wakelocks补丁集中演化而来，用于取代Android wakelocks中的自动休眠功能。向该文件写入/sys/power/state返回值的某一种，系统会在适当的时候进入指定的休眠的模式；读取该文件返回之前写入的数值。
/sys/power/wake_lock、/sys/power/wake_unlock：即我们常说的休眠锁，如果应用持有休眠锁，系统将无法进入休眠模式。在Android wakelocks时代，写wake_lock获取锁，写wake_unlock释放锁；在AutoSleep时代，具体参见【Android休眠】之AutoSleep
wakeup_count：用于解决“system suspend和system wakeup events之间的同步问题”。
/sys/power/pm_async：状态切换开关，允许/禁止User空间对设备进行异步的suspend和resume操作。
/sys/power/pm_freeze_timeout：系统在执行休眠动作的时候要冻结(freeze)用户控件的进程和内核空间的允许冻结的内核线程，执行这些操作要耗时间吧？该文件指定所需时间的最大值。