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