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

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Date:	Fri, 28 May 2010 07:15:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Paul@...p1.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	felipe.balbi@...ia.com, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, 2010-05-27 at 15:19 -0400, Alan Stern wrote:
> On Thu, 27 May 2010, Peter Zijlstra wrote:
> 
> > I still don't see how blocking applications will cause missed wakeups in
> > anything but a buggy application at worst, and even those will
> > eventually get the event when they unblock.
> > 
> > What seems to be the confusion?
> 
> During forced suspend, applications are block because they are frozen.
> 
> When an event occurs, the application is notified somehow.  But it 
> can't respond because it is frozen.  Hence the event remains sitting in 
> a kernel queue and the system goes ahead and suspends anyway.  The 
> application doesn't get thawed until the system wakes up at some 
> indefinite time in the future.

If the kernel is awake to put things in queues, we're clearly not
suspended and userspace is running ?!
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