[PATCH 05/10] vmscan: Synchrounous lumpy reclaim use lock_page() instead trylock_page()

[Mel Gorman]

From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>

With synchrounous lumpy reclaim, there is no reason to give up to reclaim
pages even if page is locked. This patch uses lock_page() instead of
trylock_page() in this case.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
---
 mm/vmscan.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5979850..79bd812 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -665,7 +665,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 		page = lru_to_page(page_list);
 		list_del(&page->lru);
 
-		if (!trylock_page(page))
+		if (sync_writeback == PAGEOUT_IO_SYNC)
+			lock_page(page);
+		else if (!trylock_page(page))
 			goto keep;
 
 		VM_BUG_ON(PageActive(page));
-- 
1.7.1

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