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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter authored and Linus Torvalds committed 2006-01-08 20:12:42 -08:00
1 parent 1480a540c9
commit ee27497df3
1 file changed
+5
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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