Re: [PATCH 09/13] PM: wakelock: Abort task freezing if a wake lock is held.

Arve Hjønnevåg
2009-02-06T03:42:13Z

On Thu, Feb 5, 2009 at 2:02 AM, Pavel Machek <pavel@ucw.cz> wrote:
> ...so I guess I'll wait for extended description.
PM: wakelock: Abort task freezing if a wakelock is locked.

If a wakelock is locked, suspend will fail anyway. Since try_to_freeze_tasks
can take up to 20 seconds to complete or fail, aborting as soon as someone
locks a wakelock (e.g. from an interrupt handler) improves the worst case
wakeup latency.

On an older kernel where task freezing could fail for processes attached
to a debugger, this fixed a problem where the device sometimes hung for
20 seconds before the screen turned on.

--
Arve Hjønnevåg