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

Andi Kleen
2006-11-23T08:52:59Z

> 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