[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 <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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 @@
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