[Xen-devel] [PATCH 13/15] xen/multicalls: add unlikely around slowpath in __xen_mc_entry()

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/xen/multicalls.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index f19e43b..b9b9811 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -123,8 +123,8 @@ struct multicall_space __xen_mc_entry(size_t args)
        BUG_ON(preemptible());
        BUG_ON(b->argidx > MC_ARGS);
 
-       if (b->mcidx == MC_BATCH ||
-           (argidx + args) > MC_ARGS) {
+       if (unlikely(b->mcidx == MC_BATCH ||
+                    (argidx + args) > MC_ARGS)) {
                trace_xen_mc_flush_reason((b->mcidx == MC_BATCH) ?
                                          XEN_MC_FL_BATCH : XEN_MC_FL_ARGS);
                xen_mc_flush();
-- 
1.7.5.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel