From: Jack Steiner <steiner@sgi.com>
Date: Tue, 24 Jan 2006 22:32:11 +0000 (-0600)
Subject: [IA64] Scaling fix for simultaneous unaligned accesses
X-Git-Tag: v2.6.16-rc2~241^2~4
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79c83bd15af3b06079a9205db9c64c92ca1bd868;p=linux-2.6

[IA64] Scaling fix for simultaneous unaligned accesses

Eliminate a hot shared cacheline that occurs if multiple cpus are
taking unaligned exceptions.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
index 43b45b65ee..f9e0ae936d 100644
--- a/arch/ia64/kernel/unaligned.c
+++ b/arch/ia64/kernel/unaligned.c
@@ -1283,8 +1283,9 @@ within_logging_rate_limit (void)
 
 	if (jiffies - last_time > 5*HZ)
 		count = 0;
-	if (++count < 5) {
+	if (count < 5) {
 		last_time = jiffies;
+		count++;
 		return 1;
 	}
 	return 0;