Commit ee27497d authored Jan 08, 2006 by Christoph Lameter Committed by Linus Torvalds Jan 08, 2006

[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>

parent 1480a540

mm/vmscan.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -689,6 +689,11 @@ int migrate_pages(struct list_head l, struct list_head t)
		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