[PATCH 2/3] check unevictable flag in lumy reclaim

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

Lumpy reclaim scans pages from their pfn. Then, it can find unevictable pages
in its loop. Abort lumpy reclaim when we find Unevictable page, we never get a
block of pages for requested order.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
Index: lumpy-reclaim-trial/mm/vmscan.c
===================================================================
--- lumpy-reclaim-trial.orig/mm/vmscan.c
+++ lumpy-reclaim-trial/mm/vmscan.c
@@ -936,6 +936,9 @@ static unsigned long isolate_lru_pages(u
 			/* Check that we have not crossed a zone boundary. */
 			if (unlikely(page_zone_id(cursor_page) != zone_id))
 				continue;
+			/* Abort when the page is mlocked */
+			if (unlikely(PageUnevictable(cursor_page)))
+				break;
 			if (__isolate_lru_page(cursor_page, mode, file) == 0) {
 				list_move(&cursor_page->lru, dst);
 				nr_taken++;

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