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

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Message-ID: <20100527190515.08be091a@lxorguk.ukuu.org.uk>
Date:	Thu, 27 May 2010 19:05:15 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Paul@...p1.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.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 18:40:19 +0100
Matthew Garrett <mjg59@...f.ucam.org> wrote:

> On Thu, May 27, 2010 at 07:34:40PM +0200, Peter Zijlstra wrote:
> > > we still need to be able to enter suspend while the system isn't idle.
> > 
> > _WHY_!?
> 
> Because if I'm running a kernel build in a tmpfs and I hit the sleep 
> key, I need to go to sleep. Blocking processes on driver access isn't 
> sufficient.

Suspend as an idle state

Suspend as a 'hand of God' choice.

One is a performance optimisation the other is an operator executive
decision.

I'd prefer we avoided mixing them up. Everyone seems fairly happy with
the current operator ordered suspend behaviour I believe ?
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