Re: [PATCH 0/8] Suspend block api (version 7)

Brian Swetland
2010-05-17T20:51:16Z

On Mon, May 17, 2010 at 1:40 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Monday 17 May 2010, Arve Hjønnevåg wrote:
>>
>> It should get out of that loop as soon as someone blocks suspend. If
>> someone is constantly aborting suspend without using a suspend blocker
>> it will be very inefficient, but it should still work.
>
> Well, the scenario I have in mind is the following.  Someone wants to check
> the feature and simply writes "opportunistic" to /sys/power/policy and "mem" to
> /sys/power/state without any drivers or apps that use suspend blockers.
>
> How in that case is the system supposed to break out of the suspend-resume loop
> resulting from this?  I don't see right now, because the main blocker is
> inactive, there are no other blockers that can be activated and it is next to
> impossible to write to /sys/power/state again.

I guess we could set a flag when a suspend blocker is registered and
refuse to enter opportunistic mode if no blockers have ever been
registered.

It does seem like extra effort to go through to handle a "don't do
that" type scenario (entering into opportunistic suspend without
anything that will prevent it).

Brian
_______________________________________________
linux-pm mailing list
linux-pm@lists.linux-foundation.org