linux-kernel - Re: [PATCH] printk: use this_cpu_{read|write} api on printk

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Date:	Fri, 26 Nov 2010 18:20:51 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, heiko.carstens@...ibm.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: Re: [PATCH] printk: use this_cpu_{read|write} api on printk_pending

Le vendredi 26 novembre 2010 à 11:11 -0600, Christoph Lameter a écrit :

> I thought sanity tests do not apply for performance testing scenarios?
> 

CONFIG_DEBUG_PREEMPT

> smp_processor_id() is usually a simple per cpu data access and very fast.
> 

Sure, but when its already in a register, its better to use the
register ;)



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