From: Andi Kleen <ak@suse.de>
Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg)
To: "Metzger, Markus T" <markus.t.metzger@intel.com>
Subject: Re: [patch][v2] x86, ptrace: support for branch trace store(BTS)
Date: Tue, 20 Nov 2007 16:57:37 +0100
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Cc: "dean gaudet" <dean@arctic.org>, linux-kernel@vger.kernel.org,
       mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de,
       "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
       akpm@linux-foundation.org
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> >and it seems like this patch and perfmon2 are going to have to 
> >live with 
> >each other... since they both require the use of the DS save area...
> 
> Hmmm, this might require some synchronization between those two.
> 
> Do you know how (accesses to) MSR's are managed by the kernel?

There is a simple MSR allocator in the nmi watchdog code. It is very
simple though and was only intended for performance counters originally
so you might need to enhance it first for complicated things.

-Andi
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