From: Zachary Amsden <zach@vmware.com>
Date: Sat, 3 Sep 2005 22:55:06 +0000 (-0700)
Subject: [PATCH] x86_64: avoid some atomic operations during address space destruction
X-Git-Tag: v2.6.14-rc1~953
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61e06037e764337da39dff307cbcdbe9cf288349;p=pandora-kernel.git

[PATCH] x86_64: avoid some atomic operations during address space destruction

Any architecture that has hardware updated A/D bits that require
synchronization against other processors during PTE operations can benefit
from doing non-atomic PTE updates during address space destruction.
Originally done on i386, now ported to x86_64.

Doing a read/write pair instead of an xchg() operation saves the implicit
lock, which turns out to be a big win on 32-bit (esp w PAE).

Signed-off-by: Zachary Amsden <zach@vmware.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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