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

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Message-ID: <20100527200604.2d67204b@lxorguk.ukuu.org.uk>
Date:	Thu, 27 May 2010 20:06:04 +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>,
	Arve Hjønnevåg <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	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 Thu, 27 May 2010 19:17:58 +0100
Matthew Garrett <mjg59@...f.ucam.org> wrote:

> On Thu, May 27, 2010 at 08:06:38PM +0200, Peter Zijlstra wrote:
> > On Thu, 2010-05-27 at 18:59 +0100, Matthew Garrett wrote:
> > > On Thu, May 27, 2010 at 07:56:21PM +0200, Peter Zijlstra wrote:
> > > > On Thu, 2010-05-27 at 18:52 +0100, Matthew Garrett wrote:
> > > > 
> > > > > If that's what you're aiming for then you don't need to block 
> > > > > applications on hardware access because they should all already have 
> > > > > idled themselves.
> > > > 
> > > > Correct, a well behaved app would have. I thought we all agreed that
> > > > well behaved apps weren't the problem?
> > > 
> > > Ok. So the existing badly-behaved application ignores your request and 
> > > then gets blocked. And now it no longer responds to wakeup events. 
> > 
> > It will, when it gets unblocked from whatever thing it got stuck on.
> 
> It's blocked on the screen being turned off. It's supposed to be reading 
> a network packet. How does it ever get to reading the network packet?

Thats a stupid argument. If you write broken code then it doesn't work.
You know if I do

	ls < unopenedfifo

it blocks too.

There is a difference between dealing with apps that overconsume
resources and arbitarily broken code (which your suspend blocker case
doesn't fix either but makes worse).

Can we stick to sane stuff ?
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