From: Ravikiran G Thirumalai <kiran@scalex86.org>
Date: Wed, 31 Dec 2008 21:44:46 +0000 (-0800)
Subject: x86: fix incorrect __read_mostly on _boot_cpu_pda
X-Git-Tag: v2.6.27.12~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fce821c44244459592f22bec255e217795de4c02;p=pandora-kernel.git

x86: fix incorrect __read_mostly on _boot_cpu_pda

commit 26799a63110dcbe81291ea53178f6b4810d07424 upstream.

The pda rework (commit 3461b0af025251bbc6b3d56c821c6ac2de6f7209)
to remove static boot cpu pdas introduced a performance bug.

_boot_cpu_pda is the actual pda used by the boot cpu and is definitely
not "__read_mostly" and ended up polluting the read mostly section with
writes.  This bug caused regression of about 8-10% on certain syscall
intensive workloads.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Acked-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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