linux-kernel - [tip:sched/core] sched/numa: Fix period

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Date:	Wed, 18 Dec 2013 02:33:17 -0800
From:	tip-bot for Wanpeng Li <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	liwanp@...ux.vnet.ibm.com, peterz@...radead.org,
	n-horiguchi@...jp.nec.com, riel@...hat.com,
	akpm@...ux-foundation.org, mgorman@...e.de, tglx@...utronix.de,
	rientjes@...gle.com
Subject: [tip:sched/core] sched/numa: Fix period_slot recalculation

Commit-ID:  e777b63bbd589248eb151a3191ee92331a701385
Gitweb:     http://git.kernel.org/tip/e777b63bbd589248eb151a3191ee92331a701385
Author:     Wanpeng Li <liwanp@...ux.vnet.ibm.com>
AuthorDate: Thu, 12 Dec 2013 15:23:26 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 17 Dec 2013 15:24:41 +0100

sched/numa: Fix period_slot recalculation

The original code is as intended and was meant to scale the difference
between the NUMA_PERIOD_THRESHOLD and local/remote ratio when adjusting
the scan period. The period_slot recalculation can be dropped.

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Acked-by: Mel Gorman <mgorman@...e.de>
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Rik van Riel <riel@...hat.com>
Link: http://lkml.kernel.org/r/1386833006-6600-4-git-send-email-liwanp@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 37892d7..4316af2 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1342,7 +1342,6 @@ static void update_task_scan_period(struct task_struct *p,
 		 * scanning faster if shared accesses dominate as it may
 		 * simply bounce migrations uselessly
 		 */
-		period_slot = DIV_ROUND_UP(diff, NUMA_PERIOD_SLOTS);
 		ratio = DIV_ROUND_UP(private * NUMA_PERIOD_SLOTS, (private + shared));
 		diff = (diff * ratio) / NUMA_PERIOD_SLOTS;
 	}
--
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