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Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
From: Peter Zijlstra <peterz@infradead.org>
To: Matthew Garrett <mjg59@srcf.ucam.org>
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Date: Thu, 27 May 2010 20:06:38 +0200
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On Thu, 2010-05-27 at 18:59 +0100, Matthew Garrett wrote:
> On Thu, May 27, 2010 at 07:56:21PM +0200, Peter Zijlstra wrote:
> > On Thu, 2010-05-27 at 18:52 +0100, Matthew Garrett wrote:
> > 
> > > If that's what you're aiming for then you don't need to block 
> > > applications on hardware access because they should all already have 
> > > idled themselves.
> > 
> > Correct, a well behaved app would have. I thought we all agreed that
> > well behaved apps weren't the problem?
> 
> Ok. So the existing badly-behaved application ignores your request and 
> then gets blocked. And now it no longer responds to wakeup events. 

It will, when it gets unblocked from whatever thing it got stuck on.

> So you penalise well-behaved applications without providing any benefits to 
> badly-behaved ones.

Uhm, how again is blocking a badly behaved app causing harm to the well
behaved one?

The well behaved one didn't get blocked and still happily waiting (on
its own accord, in sys_poll() or something) for something to happen, if
it would get an event it'd be placed on the runqueue and do its thing.