linux-kernel - Re: [RFC] [PATCH] Pre-emption control for userspace

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Message-ID: <alpine.DEB.2.02.1403050129570.18573@ionos.tec.linutronix.de>
Date:	Wed, 5 Mar 2014 01:39:07 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Khalid Aziz <khalid.aziz@...cle.com>
cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	peterz@...radead.org, akpm@...ux-foundation.org,
	andi.kleen@...el.com, rob@...dley.net, viro@...iv.linux.org.uk,
	oleg@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] Pre-emption control for userspace

On Tue, 4 Mar 2014, Khalid Aziz wrote:
> be in the right control group. Besides they want to use a common mechanism
> across multiple OSs and pre-emption delay is already in use on other OSs. Good
> idea though.

Well, just because preemption delay is a mechanism exposed by some
other OS does not make it a good idea.

In fact its a horrible idea.

What you are creating is a crystal ball based form of time bound
priority ceiling with the worst user space interface i've ever seen.

Thanks,

	tglx
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