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

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Message-ID: <20100527170740.GA1980@srcf.ucam.org>
Date:	Thu, 27 May 2010 18:07:40 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arve Hjønnevåg <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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, May 27, 2010 at 07:04:38PM +0200, Thomas Gleixner wrote:
> On Thu, 27 May 2010, Matthew Garrett wrote:
> > Sure, if you're not using opportunistic suspend then I don't think 
> > there's any real need for the userspace side of this. The question is 
> > how to implement something with the useful properties of opportunistic 
> > suspend without without implementing something pretty much equivalent to 
> > the userspace suspend blockers. I've sent another mail expressing why I 
> > don't think your proposed QoS style behaviour provides that.
> 
> Opportunistic suspend is just a deep idle state, nothing else.

No. The useful property of opportunistic suspend is that nothing gets 
scheduled. That's fundamentally different to a deep idle state.

> Stop thinking about suspend as a special mechanism. It's not - except
> for s2disk, which is an entirely different beast.

On PCs, suspend has more in common with s2disk than it does C states.

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