linux-kernel - [PATCH 13/15] xen/multicalls: add unlikely around slowpath in __xen_mc

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Date:	Mon, 20 Jun 2011 15:15:09 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Xen Devel <Xen-devel@...ts.xensource.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 13/15] xen/multicalls: add unlikely around slowpath in __xen_mc_entry()

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 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

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