linux-kernel - Re: [RFC] per-cpu preempt

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Message-ID: <20130813162602.GC24092@twins.programming.kicks-ass.net>
Date:	Tue, 13 Aug 2013 18:26:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <bitbucket@...ine.de>,
	Peter Anvin <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] per-cpu preempt_count

On Tue, Aug 13, 2013 at 05:56:37PM +0200, Ingo Molnar wrote:

> PREEMPT_NEED_RESCHED could be made the high bit - or maybe an even simpler 
> solution is to invert its meaning: making '0' the "it needs to resched!" 
> case, so the check would be decl+jz?

Right, inverted NEED_RESCHED would work.

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