linux-kernel - Re: [PATCH 2/2] powerpc: implement arch_scale_smt

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Date:	Sun, 24 Jan 2010 14:00:28 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Joel Schopp <jschopp@...tin.ibm.com>
Cc:	Michael Neuling <mikey@...ling.org>, Ingo Molnar <mingo@...e.hu>,
	ego@...ibm.com, linuxppc-dev@...ts.ozlabs.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7

On Wed, 2010-01-20 at 16:09 -0600, Joel Schopp wrote:
> I can turn that into a conditional branch (case statement) with a shift 
> for the common 1,2,4 cases which should cover all procs available today 
> falling back to a divide for any theoretical future processors that do 
> other numbers of threads. 

Look at the cputhreads.h implementation ... Today we only support
power-of-two numbers of threads.

Cheers,
Ben.


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