From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Mon, 7 Jul 2008 19:07:52 +0000 (-0700)
Subject: xen: use lock-byte spinlock implementation
X-Git-Tag: v2.6.27-rc1~955^2^2~7
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=56397f8dadb40055479a8ffff23f21a890098a31;p=linux-2.6-omap-h63xx.git

xen: use lock-byte spinlock implementation

Switch to using the lock-byte spinlock implementation, to avoid the
worst of the performance hit from ticket locks.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Lameter <clameter@linux-foundation.org>
Cc: Petr Tesarik <ptesarik@suse.cz>
Cc: Virtualization <virtualization@lists.linux-foundation.org>
Cc: Xen devel <xen-devel@lists.xensource.com>
Cc: Thomas Friebel <thomas.friebel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f702199312a..a8ebafc09d4 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -430,4 +430,5 @@ void __init xen_smp_init(void)
 {
 	smp_ops = xen_smp_ops;
 	xen_fill_possible_map();
+	paravirt_use_bytelocks();
 }