linux-kernel - Re: [PATCH 0/4][RFC] jump label: introduce default true branch

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Date:	Mon, 20 Feb 2012 23:51:41 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jason Baron <jbaron@...hat.com>, rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com, mingo@...e.hu, davem@...emloft.net,
	ddaney.cavm@...il.com, pjt@...gle.com, rth@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4][RFC] jump label: introduce default true branch

On Mon, 2012-02-20 at 14:47 -0800, H. Peter Anvin wrote:
> On 12/21/2011 11:09 AM, Jason Baron wrote:
> > Hi Peter,
> > 
> > I've introduced a new static_branch_def_true() construct, such that the straight
> > line path is the true branch, and we patch a jump to get to the false branch.
> > In order to make jump_label_inc()/dec() work as 'make true'/'make false' with
> > counting, I've had to update some of the core jump label code. This patchset also
> > introduces: JUMP_LABEL_INIT_TRUE/FALSE, so that keys should be initialized as:
> > 
> > struct jump_label_key true_key = JUMP_LABEL_INIT_TRUE;
> > 
> >            or
> > 
> > struct jump_label_key false_key = JUMP_LABEL_INIT_FALSE;
> > 
> > I think this patch series should address the issues that came up with sched_feat()
> > implementation.
> > 
> 
> Hi,
> 
> Did this ever get addressed?

I actually tried to push that stuff to Ingo, he figured it all should
have different names. Jason and Ingo went back and forth for a while and
afaik settled on something. Jason then went off to implement, but I
haven't yet seen a new version.


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