linux-kernel - Re: [PATCH, v10 3/3] cgroups: introduce timer slack controller

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Message-ID: <20111017151920.GA16664@srcf.ucam.org>
Date:	Mon, 17 Oct 2011 16:19:20 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Lennart Poettering <mzxreary@...inter.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	jacob.jun.pan@...ux.intel.com, linux-kernel@...r.kernel.org,
	Matt Helsley <matthltc@...ibm.com>, linux-api@...r.kernel.org,
	Kay Sievers <kay.sievers@...y.org>, harald@...hat.com,
	david@...ar.dk, greg@...ah.com
Subject: Re: [PATCH, v10 3/3] cgroups: introduce timer slack controller

On Mon, Oct 17, 2011 at 05:11:00PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-10-17 at 15:59 +0100, Matthew Garrett wrote:
> > I'm not saying that it's a problem. I'm saying that your approach 
> > changes behavioural semantics in a way that may violate application 
> > expectations just as surely as changing the timer behaviour does. 
> > There's no free approach.
> 
> I'm not saying its free, I'm saying its a much better approach since it
> gets rid of the entire problem instead of papering over the worst of it.

It solves it for a specific case, ie animations. Any other timer driven 
behaviour continues. It really does need to be tied to session idle, not 
application visibility, and enforcement at the X level does nothing to 
help that.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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