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[PATCH] x86-64: Speed up dwarf2 unwinder

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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>
This commit is contained in:
Jan Beulich 2006-10-21 18:37:01 +02:00 • committed by Andi Kleen
commit 690a973f48
5 changed files with 298 additions and 38 deletions
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2
include/linux/unwind.h
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@ -26,6 +26,7 @@ struct module;
* Initialize unwind support.
*/
extern void unwind_init(void);
extern void unwind_setup(void);
#ifdef CONFIG_MODULES
@ -73,6 +74,7 @@ extern int unwind_to_user(struct unwind_frame_info *);
struct unwind_frame_info {};
static inline void unwind_init(void) {}
static inline void unwind_setup(void) {}
#ifdef CONFIG_MODULES