linux-kernel - [PATCH v7 4/4] sched/numa: fix period

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Date:	Thu, 12 Dec 2013 08:12:23 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH v7 4/4] sched/numa: fix period_slot recalculation

Changelog:
 v3 -> v4:
  * remove 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.

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Acked-by: Mel Gorman <mgorman@...e.de>
Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 kernel/sched/fair.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d93c86f..c962167 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1356,7 +1356,6 @@ 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;
 	}
-- 
1.8.3.2

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