Updated perf backtrace improvement patchkit

From: Andi Kleen
Date: Fri Oct 10 2014 - 19:26:11 EST

I reworked the patchkit to speed up perf backtracing based on
the feedback. It now uses a new method to determine the kernel
addresses using the page tables, and also avoids using copy_*_user
in the backtrace at all.

The goal is to avoid perf exceeding the NMI handler CPU time quota.

In addition this patchkit also optimizes the generic fault handling
for one case in copy_*_user (running on systems with enhanced copy

Hopefully this version is more acceptable.


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