[PATCH v8 4/4] sched/numa: fix period_slot recalculation

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

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@ah.jp.nec.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 kernel/sched/fair.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8a00879..e7ca79a 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;
 	}
-- 
1.7.7.6

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