From ee27497df36823f2793212cad0997c044eb0e1eb Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sun, 8 Jan 2006 01:00:54 -0800 Subject: [PATCH] SwapMig: Drop unused pages immediately Drop unused pages immediately If a page is encountered that is only referenced by the migration code then there is no reason to swap or migrate the page. Release the page by calling move_to_lru(). Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 5393b093..73ba404 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -689,6 +689,11 @@ redo: list_for_each_entry_safe(page, page2, l, lru) { cond_resched(); + if (page_count(page) == 1) { + /* page was freed from under us. So we are done. */ + move_to_lru(page); + continue; + } /* * Skip locked pages during the first two passes to give the * functions holding the lock time to release the page. Later we -- cgit v1.1