mm: numa: remove migrate_ratelimited

This code is dead since commit 9e645ab6d0 ("sched/numa: Continue PTE
scanning even if migrate rate limited") so remove it.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/migrate.c

@@ -1565,30 +1565,10 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
  * page migration rate limiting control.
  * Do not migrate more than @pages_to_migrate in a @migrate_interval_millisecs
  * window of time. Default here says do not migrate more than 1280M per second.
- * If a node is rate-limited then PTE NUMA updates are also rate-limited. However
- * as it is faults that reset the window, pte updates will happen unconditionally
- * if there has not been a fault since @pteupdate_interval_millisecs after the
- * throttle window closed.
  */
 static unsigned int migrate_interval_millisecs __read_mostly = 100;
-static unsigned int pteupdate_interval_millisecs __read_mostly = 1000;
 static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT);
 
-/* Returns true if NUMA migration is currently rate limited */
-bool migrate_ratelimited(int node)
-{
-	pg_data_t *pgdat = NODE_DATA(node);
-
-	if (time_after(jiffies, pgdat->numabalancing_migrate_next_window +
-				msecs_to_jiffies(pteupdate_interval_millisecs)))
-		return false;
-
-	if (pgdat->numabalancing_migrate_nr_pages < ratelimit_pages)
-		return false;
-
-	return true;
-}
-
 /* Returns true if the node is migrate rate-limited after the update */
 static bool numamigrate_update_ratelimit(pg_data_t *pgdat,
 					unsigned long nr_pages)