[PATCH 2/3] check unevictable flag in lumy reclaim v2

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

How about this ?

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Lumpy reclaim check 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 lump
of pages for requested order.

Changelog: v1->v2
 - rewrote commet.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 mm/vmscan.c |    9 +++++++++
 1 file changed, 9 insertions(+)

Index: lumpy-reclaim-trial/mm/vmscan.c
===================================================================
--- lumpy-reclaim-trial.orig/mm/vmscan.c
+++ lumpy-reclaim-trial/mm/vmscan.c
@@ -936,6 +936,15 @@ 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;
+			/*
+			 * We tries to free all pages in this range to create
+			 * a free large page. Then, if the range includes a page
+			 * never be reclaimed, we have no reason to do more.
+			 * PageUnevictable page is not a page which can be
+			 * easily freed. Abort this scan now.
+			 */
+			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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