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 f702199312a5b82c5d580f5987d6dc33e4c50e4d..a8ebafc09d4787dcbdcf868cd381b72236140725 100644 (file)
--- 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();
 }