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 <[email protected]>
Index: linux-2.6.15-rc1-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.15-rc1-mm1.orig/mm/vmscan.c 2005-11-17 15:59:07.000000000 -0800
+++ linux-2.6.15-rc1-mm1/mm/vmscan.c 2005-11-17 16:05:18.000000000 -0800
@@ -700,6 +700,11 @@ 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
-
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