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

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Message-ID: <Pine.LNX.4.44L0.1005271303190.3239-100000@iolanthe.rowland.org>
Date:	Thu, 27 May 2010 13:04:24 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Balbi <felipe.balbi@...ia.com>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	Arve Hjønnevåg <arve@...roid.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul@...p1.linux-foundation.org" <Paul@...p1.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	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, 27 May 2010, Felipe Balbi wrote:

> On Thu, May 27, 2010 at 05:06:23PM +0200, ext Alan Stern wrote:
> >If people don't mind, here is a greatly simplified summary of the
> >comments and objections I have seen so far on this thread:
> >
> >	The in-kernel suspend blocker implementation is okay, even
> >	beneficial.
> 
> I disagree here. I believe expressing that as QoS is much better. Let 
> the kernel decide which power state is better as long as I can say I 
> need 100us IRQ latency or 100ms wakeup latency.

Does this mean you believe "echo mem >/sys/power/state" is bad and
should be removed?  Or "echo disk >/sys/power/state"?  They pay no
attention to latencies or other requirements.

Alan Stern

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