linux-kernel - Re: [RFC][PATCH 0/5] preempt

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Message-ID: <520BA590.2030808@zytor.com>
Date:	Wed, 14 Aug 2013 08:43:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Galbraith <bitbucket@...ine.de>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC][PATCH 0/5] preempt_count rework

On 08/14/2013 08:39 AM, Mike Galbraith wrote:
> 
> ..so could the rq = cpu_rq(cpu) sequence be improved cycle expenditure
> wise by squirreling rq pointer away in a percpu this_rq, and replacing
> cpu_rq(cpu) above with a __this_cpu_read(this_rq) version of this_rq()?
> 

Yes.

	-hpa


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