[PATCH 64 of 66] scale nr_rotated to balance memory pressure

[Andrea Arcangeli]

From: Rik van Riel <riel@xxxxxxxxxx>

Make sure we scale up nr_rotated when we encounter a referenced
transparent huge page.  This ensures pageout scanning balance
is not distorted when there are huge pages on the LRU.

Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1259,7 +1259,8 @@ putback_lru_pages(struct zone *zone, str
 		add_page_to_lru_list(zone, page, lru);
 		if (is_active_lru(lru)) {
 			int file = is_file_lru(lru);
-			reclaim_stat->recent_rotated[file]++;
+			int numpages = hpage_nr_pages(page);
+			reclaim_stat->recent_rotated[file] += numpages;
 		}
 		if (!pagevec_add(&pvec, page)) {
 			spin_unlock_irq(&zone->lru_lock);
@@ -1535,7 +1536,7 @@ static void shrink_active_list(unsigned 
 		}
 
 		if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
-			nr_rotated++;
+			nr_rotated += hpage_nr_pages(page);
 			/*
 			 * Identify referenced, file-backed active pages and
 			 * give them one more trip around the active list. So
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