linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Message-ID: <1274983598.27810.5761.camel@twins>
Date:	Thu, 27 May 2010 20:06:38 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arve Hjønnevåg <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul@...p1.linux-foundation.org, felipe.balbi@...ia.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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.
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