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

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Message-ID: <20100527181433.GG3543@srcf.ucam.org>
Date:	Thu, 27 May 2010 19:14:33 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul@...p1.linux-foundation.org,
	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, May 27, 2010 at 08:02:13PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-05-27 at 18:57 +0100, Matthew Garrett wrote:
> > If you want to support forced suspend for laptops and you want to avoid 
> > the risk of losing wakeups then you need in-kernel suspend blockers. 
> > That's entirely orthogonal to Android's runtime power management.
> 
> The simple fact of life is, on PC style hardware suspend is mostly about
> missing events. I really _really_ want to miss mouse movement of my
> bluetooth mouse when the gear is stowed in my backpack.

That's fine - those shouldn't be configured as wakeup events.

> Its perfectly OK to miss events on _forced_ suspend.

No, it's not. Forced suspend may be in response to hitting a key, but it 
may also be in response to a 30 minute timeout expiring. If I get a WoL 
packet in the 0.5 of a second between userspace deciding to suspend and 
actually doing so, the system shouldn't suspend.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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