Re: [RFC][PATCH 00/11] Android PM extensions

Pavel Machek
2009-02-04T13:25:13Z

Hi!

> <ncunningham@crca.org.au> wrote:
> > It sounds to me like all of this stuff is just power management of
> > individual devices, which should be done through the sysfs interface and
> > completely unrelated to /sys/power/state.
>
> It is easier for us to add a hook to the individual drivers than to
> maintain a list of devices in user-space. Also, last time I checked,
> the only way to disable individual devices was through a deprecated
> interface. Is there a new way to do this?

No, but we need one, sooner or later. I'd say that implementing nice
device power management would be better than early-suspend hack.

> > That said, if suspend to ram is what they really want for 'auto-mem',
> > what you're suggesting sounds good to me.
>
> Suspend gives us two advantages over idle. All threads are frozen
> which means that an app that is using too much cpu time no longer
> drains the battery. And, the monotonic clock stops.

SIGSTOP should be the right tool if some application uses too much
cycles...

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