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Subject: Re: SMP Pentium4 -- PAUSE Instruction
From: Arjan van de Ven <arjanv@redhat.com>
To: "Calin A. Culianu" <calin@ajvar.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, 2002-12-03 at 16:42, Calin A. Culianu wrote:

> Is this instruction being used in spin-wait loops?  For some reason, I am
> having a hard time figuring out whether or not it is being used.  There is
> a rep_nop() in processor.h.. but I can't determine if that is being called
> for spin lock lock/unlock code.

check cpu_relax() all over the kernel :)
and the spinlock code uses it inside it's own asm directly, not via
rep_nop()


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