Messages in this thread | | | Date | Fri, 26 Nov 2010 11:27:00 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [PATCH] printk: use this_cpu_{read|write} api on printk_pending |
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On Fri, 26 Nov 2010, Eric Dumazet wrote:
> 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
You really enable that option for performance testing?
> > 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 ;)
Well that increases register pressure in the caller. There may be no need to handle the current processor number in the caller.
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