linux-kernel - Re: [ANNOUNCE] 3.0.4-rt13

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Date:	Tue, 13 Sep 2011 18:13:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.0.4-rt13

On Tue, 2011-09-13 at 17:28 +0200, Mike Galbraith wrote:
> On Tue, 2011-09-13 at 17:08 +0200, Peter Zijlstra wrote:
> > On Tue, 2011-09-13 at 15:36 +0200, Peter Zijlstra wrote:
> > > Does the below cure things? It breaks !rt builds, but we can cure that
> > > if it works..
> > 
> > n/m its broken like hell..
> 
> Since this seems to be a legitimate need for a non-preemptive wakeup,
> how about we [re]create one to get rid of abuse?  (otoh, that would add
> a branch everywhere.. btdt a couple times, always ended up tossing it)

Nah, we absolutely need to kill that preempt_disable/enable stuff in
there, it covers an O(n^2) loop, its complete crap.

Just need to wrap my head around that code..
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