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

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Message-Id: <201005280150.24873.rjw@sisk.pl>
Date:	Fri, 28 May 2010 01:50:24 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	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)

On Friday 28 May 2010, Alan Cox wrote:
> On Thu, 27 May 2010 23:55:13 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Thursday 27 May 2010, Alan Cox wrote:
> > > > > If one works so does the other.
> > > > 
> > > > Not at all. The entire point of opportunistic suspend is that I don't 
> > > > care is currently in TASK_RUNNABLE or has a timer that's due to expire 
> > > > in 100msec - based on policy (through not having any held suspend 
> > > > blockers), I'll go to sleep. That's easily possible on PCs.
> > > 
> > > Yes I appreciate what suspend blockers are trying to do. Now how does
> > > that connect with my first sentence ?
> > 
> > I guess what Matthew wanted to say was that you couldn't use ACPI S3 as
> > a very deep CPU idle state, because of the way wakeup sources are set up
> > for it, while you could use it for aggressive power management with suspend
> > blockers as proposed by Arve.
> 
> Which is a nonsense. Because the entire Gnome desktop and KDE, and
> OpenOffice and Firefox and friends would need fitting out with
> suspend blockers.
> 
> x86 hardware is moving to fix these problems (at least on handheld
> devices initially). Look up the C6 power idle, and S0i1 and S0i3
> standby states. I reckon the laptop folks can probably get the hardware
> fixed well before anyone can convert the entire PC desktop to include
> blockers.

To clarify, I'm not suggesting to spread suspend blockers all over the
universe.

Rafael
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