linux-kernel - [PATCH] lockstat - repair erronous contention statistics

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Message-ID: <20080825211623.GA27969@tsunami.ccur.com>
Date:	Mon, 25 Aug 2008 17:16:23 -0400
From:	Joe Korty <joe.korty@...r.com>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] lockstat - repair erronous contention statistics

Fix bad contention counting in /proc/lock_stat.

/proc/lockstat tries to gather per-ip contention
statistics per-lock.  This was failing due to
a garbage per-ip index selector being used.

Index: 2.6.26/kernel/lockdep.c
===================================================================
--- 2.6.26.orig/kernel/lockdep.c	2008-07-13 17:51:29.000000000 -0400
+++ 2.6.26/kernel/lockdep.c	2008-08-25 17:00:15.000000000 -0400
@@ -2791,7 +2791,7 @@
 
 	stats = get_lock_stats(hlock->class);
 	if (point < ARRAY_SIZE(stats->contention_point))
-		stats->contention_point[i]++;
+		stats->contention_point[point]++;
 	if (lock->cpu != smp_processor_id())
 		stats->bounces[bounce_contended + !!hlock->read]++;
 	put_lock_stats(stats);
--
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