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

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Message-ID: <20100529102819.21732783@schatten.dmk.lab>
Date:	Sat, 29 May 2010 10:28:19 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Igor Stoppa <igor.stoppa@...ia.com>,
	ext Brian Swetland <swetland@...gle.com>,
	ext Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"tytso@....edu" <tytso@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Sat, 29 May 2010 02:42:35 +0300
Felipe Contreras <felipe.contreras@...il.com> wrote:

> On Fri, May 28, 2010 at 5:12 PM, Igor Stoppa <igor.stoppa@...ia.com> wrote:
> > ext Brian Swetland wrote:
> >> How is it flawed?  Serious question.
> >
> > I would avoid repeating all the good arguments given so far, but to make it
> > short:
> >
> > * I believe runtime PM is a much better starting point (at least for the
> > type of HW targeted at mobile devices) because it mimics an always-on system
> > toward userspace, which requires less disruption in the way apps are
> > designed
> 
> I agree.
> 
> If I understand correctly, if we have a perfect user-space that only
> does work when strictly needed and trying to do it in bursts, then we
> would be reaching the lowest power state, and there would be no need
> for suspend. The problem is that Android's user-space is pretty far
> from that, so they said "let's segregate user-space and go to lower
> power mode anyway".

This has already been mentioned (who knew?): Android doesn't
want to depend on userspace for this.

Cheers,
Flo
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