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

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Message-ID: <1318869239.4172.64.camel@twins>
Date:	Mon, 17 Oct 2011 18:33:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Matthew Garrett <mjg@...hat.com>,
	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, 2011-10-17 at 16:48 +0100, Alan Cox wrote:
> > Hard enforcement is very much better than papering over because it makes
> > the individual developer instantly aware that he's got a problem.
> 
> Not always
> 
> If you do weird container crap with timers than app authors will simply
> point out that the weird container crap is buggy as it works properly in
> a normal environment.

Oh agreed. I never said the hard enforcement would/should rely on
container crap. I'm very much in favour of a machine that's fully
functional with a CGROUP=n kernel, thank you very much.

Sadly a number of (userspace) wankers (some included on this thread)
seem hell bent on making that impossible.
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