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

[Andi Kleen]

> 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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