linux-kernel - Re: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection

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Message-ID: <20061123085254.GA29738@bingen.suse.de>
Date:	Thu, 23 Nov 2006 09:52:54 +0100
From:	Andi Kleen <ak@...e.de>
To:	Keith Owens <kaos@....com>
Cc:	Andi Kleen <ak@...e.de>, Jeremy Fitzhardinge <jeremy@...p.org>,
	eranian@....hp.com, linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection

> LBR is mainly useful on wild branches to random addresses.  As such,

The page fault handler is one of the most performance critical 
exceptions.  And then on x86-64 a lot of stray pointers actually result in a 
#GP, not a page fault.

-Andi
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