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

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Message-ID: <20100527171833.GD9625@nokia.com>
Date:	Thu, 27 May 2010 20:18:33 +0300
From:	Felipe Balbi <felipe.balbi@...ia.com>
To:	ext Thomas Gleixner <tglx@...utronix.de>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	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" <Paul@...p1.linux-foundation.org>,
	"Balbi Felipe (Nokia-D/Helsinki)" <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)

Hi,

On Thu, May 27, 2010 at 07:04:38PM +0200, ext Thomas Gleixner wrote:
>Opportunistic suspend is just a deep idle state, nothing else. If the
>overall QoS requirements allow to enter that deep idle state then the
>kernel goes there. Same decision as for all other idle states. You
>don't need any user space blocker for this decision, just sensible QoS
>information.

agree completely with you. Adding virtual differences between power 
states is a bad idea and causes unnecessary complication to the system. 
If we have a generic way of describing desired latencies (irq, wakeup, 
throughput, whatever), then the kernel should decide what's the best 
power state for the current situation.

-- 
balbi

DefectiveByDesign.org
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