linux-kernel - [PATCH v3 09/12] sched/numa: fix task scan rate adjustment

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Date:	Sun,  8 Dec 2013 14:14:50 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	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 v3 09/12] sched/numa: fix task scan rate adjustment

commit 04bb2f947 (sched/numa: Adjust scan rate in task_numa_placement) calculate
period_slot which should be used as base value of scan rate increase if remote
access dominate. However, current codes forget to use it, this patch fix it.

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 kernel/sched/fair.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7073c76..b077f1b3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1358,7 +1358,7 @@ static void update_task_scan_period(struct task_struct *p,
 		 */
 		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;
+		diff = (period_slot * ratio) / NUMA_PERIOD_SLOTS;
 	}
 
 	p->numa_scan_period = clamp(p->numa_scan_period + diff,
-- 
1.7.5.4

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