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

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Message-ID: <20100527191716.16b4a8e3@lxorguk.ukuu.org.uk>
Date:	Thu, 27 May 2010 19:17:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	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)

> > 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.

If one works so does the other.

> In some cases, not all. It may be a latency constraint (in which case 
> pm_qos is an appropriate mechanism), but instead it may be something 
> like "A key was pressed but never read" or "A network packet was 
> received but not delivered". These don't fit into the pm_qos model, but 
> it's state that you have to track.

I never mentioned pm_qos, just latency *and* knowing what suspend states
are acceptable. You need both.

Alan
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