linux-kernel - Re: [patch 1/8] 2.6.22-rc3 perfmon2 : IBS implementation for AMD64

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Message-ID: <20070620183605.GF24544@erda.amd.com>
Date:	Wed, 20 Jun 2007 20:36:05 +0200
From:	"Robert Richter" <robert.richter@....com>
To:	"David Rientjes" <rientjes@...gle.com>
cc:	"Stephane Eranian" <eranian@....hp.com>,
	"Andi Kleen" <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/8] 2.6.22-rc3 perfmon2 : IBS implementation for
 AMD64

David,

thanks for your comments.

On 15.06.07 11:54:24, David Rientjes wrote:
> On Fri, 15 Jun 2007, Robert Richter wrote:
> 
> > Index: linux-2.6.22-rc3/arch/i386/perfmon/perfmon.c
> > ===================================================================
> > --- linux-2.6.22-rc3.orig/arch/i386/perfmon/perfmon.c
> > +++ linux-2.6.22-rc3/arch/i386/perfmon/perfmon.c
> > @@ -1059,6 +1059,7 @@ char *pfm_arch_get_pmu_module_name(void)
> >  			goto try_arch;
> >  		}
> >  	case 15:
> > +	case 16:
> >  		/* All Opteron processors */
> >  		if (cpu_data->x86_vendor == X86_VENDOR_AMD)
> >  			return "perfmon_k8";
> 
> Constants like these should be #define'd in a header file but, admittedly, 
> it might become a rather intrusive change at this point for the above 
> case.

All current x86 CPU detection code in the kernel is using hard coded
numbers. Introducing new defines for family and model numbers would
not be suitable here.

Thanks,
-Robert

-- 
AMD Saxony, Dresden, Germany
Operating System Research Center
email: robert.richter@....com



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