Commit ee27497d authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds

[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: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1480a540
......@@ -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
......
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