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

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Message-ID: <20111017164929.GA18620@srcf.ucam.org>
Date:	Mon, 17 Oct 2011 17:49:29 +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 06:36:44PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-10-17 at 16:31 +0100, Matthew Garrett wrote:
> > On Mon, Oct 17, 2011 at 05:21:10PM +0200, Peter Zijlstra wrote:
> > 
> > > Well what other cases are there? Can we enumerate them and come up 
> > > with similar solutions?
> > 
> > Javascript has timers. We execute rather a lot of javascript from 
> > sources we can't influence at all.
> 
> Which brings me to yet another gripe I've got with firefox, _WHY_ does
> it run javascript for tabs I can't see? Simply freeze the interpreter.

Because people expect gmail to provide them with status updates even if 
it's not the foreground tab.

> Then again, what does JavaScript do with these timers? I don't really
> see how javascript/random-native-binary are really different, something
> needs doing. What something?

I agree that the thing that needs doing probably involves web developers 
and threats of implied violence, but I suspect that web developers are 
being created faster than we can reeducate them.

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