From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 5 Sep 2007 12:32:49 +0000 (+0200)
Subject: sched: fix niced_granularity() shift
X-Git-Tag: v2.6.23-rc6~15^2~6
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0dc72601d48b171b4870dfdd0824901a2b2b1a9;p=linux-2.6

sched: fix niced_granularity() shift

fix niced_granularity(). This resulted in under-scheduling for
CPU-bound negative nice level tasks (and this in turn caused
higher than necessary latencies in nice-0 tasks).

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index ce39282d9c..810b52d994 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -291,7 +291,7 @@ niced_granularity(struct sched_entity *curr, unsigned long granularity)
 	/*
 	 * It will always fit into 'long':
 	 */
-	return (long) (tmp >> WMULT_SHIFT);
+	return (long) (tmp >> (WMULT_SHIFT-NICE_0_SHIFT));
 }
 
 static inline void