From: Jan Beulich <jbeulich@novell.com>
Date: Sat, 21 Oct 2006 16:37:01 +0000 (+0200)
Subject: [PATCH] x86-64: Speed up dwarf2 unwinder
X-Git-Tag: v2.6.19-rc3~15^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=690a973f48b6ba2954465992c08e65059c8374fe;p=pandora-kernel.git

[PATCH] x86-64: Speed up dwarf2 unwinder

This changes the dwarf2 unwinder to do a binary search for CIEs
instead of a linear work. The linker is unfortunately not
able to build a proper lookup table at link time, instead it creates
one at runtime as soon as the bootmem allocator is usable (so you'll continue
using the linear lookup for the first [hopefully] few calls).
The code should be ready to utilize a build-time created table once
a fixed linker becomes available.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
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