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

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Message-ID: <Pine.LNX.4.44L0.1005271520070.3239-100000@iolanthe.rowland.org>
Date:	Thu, 27 May 2010 15:22:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	<felipe.balbi@...ia.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, 27 May 2010, Peter Zijlstra wrote:

> On Thu, 2010-05-27 at 18:40 +0100, Matthew Garrett wrote:
> > On Thu, May 27, 2010 at 07:34:40PM +0200, Peter Zijlstra wrote:
> > > > we still need to be able to enter suspend while the system isn't idle.
> > > 
> > > _WHY_!?
> > 
> > Because if I'm running a kernel build in a tmpfs and I hit the sleep 
> > key, I need to go to sleep. Blocking processes on driver access isn't 
> > sufficient.
> 
> But that's a whole different issue. I agree that a forced suspend for
> things like that make sense, just not for power managing a running
> system.

Why not?  Or rather, why shouldn't it?

> PC style hardware like that doesn't wake up from suspend for
> funny things like a keypress either (good thing too).

Yes it does.  If I close the lid of my laptop, wait a few seconds for 
it to suspend, then open the lid (which does not wake it up), and hit a 
key -- it wakes up.

> Anyway all that already works (more or less), so I don't see the
> problem.

The "less" part is the problem.  It would be nice to have a forced 
suspend mode that is more dicriminating: Instead of activating 
immediately it would wait until all pending events were handled.

Alan Stern

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