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[PATCH] SwapMig: Drop unused pages immediately

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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>
This commit is contained in:
Christoph Lameter
2006-01-08 01:00:54 -08:00
committed by Linus Torvalds
parent 1480a540c9
commit ee27497df3
1 changed files with 5 additions and 0 deletions
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5
mm/vmscan.c
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@@ -689,6 +689,11 @@ redo:
list_for_each_entry_safe(page, page2, l, lru) { list_for_each_entry_safe(page, page2, l, lru) {
cond_resched(); 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 * Skip locked pages during the first two passes to give the
* functions holding the lock time to release the page. Later we * functions holding the lock time to release the page. Later we