[PATCH 3/7] vmscan: synchrounous lumpy reclaim use lock_page() instead trylock_page()

From: KOSAKI Motohiro
Date: Thu Aug 05 2010 - 02:13:51 EST

When synchrounous lumpy reclaim, there is no reason to give up to
reclaim pages even if page is locked. We use lock_page() instead
trylock_page() in this case.

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

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1cdc3db..833b6ad 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);

- if (!trylock_page(page))
+ if (sync_writeback == PAGEOUT_IO_SYNC)
+ lock_page(page);
+ else if (!trylock_page(page))
goto keep;


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