linux-kernel - [PATCH] oom_kill -- don't call for int

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Message-ID: <20090113143835.GI7682@localhost>
Date:	Tue, 13 Jan 2009 17:38:35 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] oom_kill -- don't call for int_sqrt(0)

There is no need to call for int_sqrt if argument is 0.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---

Please review.

 mm/oom_kill.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

Index: linux-2.6.git/mm/oom_kill.c
===================================================================
--- linux-2.6.git.orig/mm/oom_kill.c
+++ linux-2.6.git/mm/oom_kill.c
@@ -55,7 +55,7 @@ static DEFINE_SPINLOCK(zone_scan_lock);
 
 unsigned long badness(struct task_struct *p, unsigned long uptime)
 {
-	unsigned long points, cpu_time, run_time, s;
+	unsigned long points, cpu_time, run_time;
 	struct mm_struct *mm;
 	struct task_struct *child;
 
@@ -110,12 +110,10 @@ unsigned long badness(struct task_struct
 	else
 		run_time = 0;
 
-	s = int_sqrt(cpu_time);
-	if (s)
-		points /= s;
-	s = int_sqrt(int_sqrt(run_time));
-	if (s)
-		points /= s;
+	if (cpu_time)
+		points /= int_sqrt(cpu_time);
+	if (run_time)
+		points /= int_sqrt(int_sqrt(run_time));
 
 	/*
 	 * Niced processes are most likely less important, so double
--
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