[linux-pm] [PATCH 05/13] PM: Add option to disable /sys/power/state interface

Brian Swetland swetland at google.com
Sun Feb 8 17:53:33 PST 2009


[Arve Hjønnevåg <arve at android.com>]
> 
> > Still, I'm very much interested in your reply to the last paragraph of my
> > message, the one that you removed.
> 
> Yes we need access to wakelocks from user space. We also allow third
> party apps to use wakelocks if they request the right permission. This
> could include a music player keeping the device on while playing a
> song, or an pop email client using an alarm to download email every
> hour.

To expand on this a bit: We don't allow arbitrary apps to directly grab
wakelocks with the sys interface -- instead a system service in
userspace manages wakelock requests on behalf of apps needing them.

This allows permission enforcement (users get to know/choose which 
apps actually *can* keep the device awake in the background) and other
policy decisions to be made at the app framework level. 

Brian


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