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

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Message-ID: <alpine.LFD.2.00.1005272015360.3032@localhost.localdomain>
Date:	Thu, 27 May 2010 20:18:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
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, 27 May 2010, Matthew Garrett wrote:

> On Thu, May 27, 2010 at 06:49:18PM +0100, Alan Cox wrote:
> > > ACPI provides no guarantees about what level of hardware functionality 
> > > remains during S3. You don't have any useful ability to determine which 
> > > events will generate wakeups. And from a purely practical point of view, 
> > > since the latency is in the range of seconds, you'll never have a low 
> > > enough wakeup rate to hit it.
> > 
> > So PCs with current ACPI don't get opportunistic suspend capability. It
> > probably won't be supported on the Commodore Amiga either - your point ?
> 
> Actually, the reverse - there's no terribly good way to make PCs work 
> with scheduler-based suspend, but there's no reason why they wouldn't 
> work with the current opportunistic suspend implementation.

How does that solve the problems you mentioned above ? Wakeup
guarantees, latencies ...

It's not a prove of the technical correctness of the approach if it
can provide a useless functionality.
 
Thanks,

	tglx
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