linux-kernel - Re: [RFC 8/8] x86_64: Support for new UV apic

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Date:	Sun, 30 Mar 2008 21:18:21 -0500
From:	Jack Steiner <steiner@....com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 8/8] x86_64: Support for new UV apic

> 
> if the calling path like GET_APIC_ID is keeping checking if it is UV
> box after boot time, that may not good.
> 
> don't need make other hundreds of machine keep running the code only
> for several big box all the time.
> 
> YH


I added trace code to see how often GET_APIC_ID() is called. For
my 8p AMD box, the  function is called 6 times per cpu during boot.
I have not seen any other calls to the function after early boot
although I'm they occur under some circumstances.

Can you think of a workload where the frequency of calls is
high enough to be significant??

--- jack
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