mm: don't waste swap on locked pages
authorHugh Dickins <hugh@veritas.com>
Tue, 5 Feb 2008 06:29:23 +0000 (22:29 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 5 Feb 2008 17:44:18 +0000 (09:44 -0800)
commit5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b
tree44fbcff2ad653d7a328bab3144d63da9aaea6f7a
parent9eccf2a816ed0aad82b577de6a40cd098ad41944
mm: don't waste swap on locked pages

try_to_unmap always fails on a page found in a VM_LOCKED vma (unless
migrating), and recycles it back to the active list.  But if it's an
anonymous page, we've already allocated swap to it: just wasting swap.
Spot locked pages in page_referenced_one and treat them as referenced.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ethan Solomita <solo@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/rmap.c