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

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Message-ID: <alpine.LFD.2.00.1005272334040.3478@localhost.localdomain>
Date:	Thu, 27 May 2010 23:40:29 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	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, Rafael J. Wysocki wrote:

> On Thursday 27 May 2010, Thomas Gleixner wrote:
> > On Thu, 27 May 2010, Alan Stern wrote:
> > 
> > > 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
> > 
> > mem should be replaced by an idle suspend to ram mechanism
> 
> Well, what about when I want the machine to suspend _regardless_ of whether
> or not it's idle at the moment?  That actually happens quite often to me. :-)

Fair enough. Let's agree on a non ambigous terminology then:

     forced:

	     suspend which you enforce via user interaction, which
     	     also implies that you risk losing wakeups depending on
     	     the hardware properties

     opportunistic:

	     suspend driven from the idle context, which guarantees to
	     not lose wakeups. Provided only when the hardware does
	     provide the necessary capabilities.

Thanks,

	tglx
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