Commit e777b63b authored Dec 12, 2013 by Wanpeng Li Committed by Ingo Molnar Dec 17, 2013

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@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Link: http://lkml.kernel.org/r/1386833006-6600-4-git-send-email-liwanp@linux.vnet.ibm.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 82897b4f

kernel/sched/fair.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -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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