From: Stephane Eranian <eranian@hpl.hp.com>
Date: Mon, 10 Jul 2006 01:12:39 +0000 (-0400)
Subject: [PATCH] i386: use thread_info flags for debug regs and IO bitmaps
X-Git-Tag: v2.6.18-rc2~253
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3cf257623fabd8f1ee6700a6d328cc1c5da5a1d;p=pandora-kernel.git

[PATCH] i386: use thread_info flags for debug regs and IO bitmaps

Use thread info flags to track use of debug registers and IO bitmaps.

 - add TIF_DEBUG to track when debug registers are active
 - add TIF_IO_BITMAP to track when I/O bitmap is used
 - modify __switch_to() to use the new TIF flags

Performance tested on Pentium II, ten runs of LMbench context switch
benchmark (smaller is better:)

	before	after
avg	3.65	3.39
min	3.55	3.33

Signed-off-by: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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