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 <[e-mail]>
Reviewed-by: Naoya Horiguchi <[e-mail]>
Acked-by: Mel Gorman <[e-mail]>
Acked-by: David Rientjes <[e-mail]>
Signed-off-by: Peter Zijlstra <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

kernel/sched/fair.c

···
 		 * 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;
 	}