From: Christoph Lameter <clameter@engr.sgi.com>

zone_reclaim should leave that to the real swapper.  We are only interested
in evicting unmapped pages.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/vmscan.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -puN mm/vmscan.c~zone_reclaim-do-not-unmap-file-backed-pages mm/vmscan.c
--- 25/mm/vmscan.c~zone_reclaim-do-not-unmap-file-backed-pages	Tue Jan 24 14:25:00 2006
+++ 25-akpm/mm/vmscan.c	Tue Jan 24 14:25:00 2006
@@ -477,6 +477,12 @@ static int shrink_list(struct list_head 
 		 * processes. Try to unmap it here.
 		 */
 		if (page_mapped(page) && mapping) {
+			/*
+			 * No unmapping if we do not swap
+			 */
+			if (!sc->may_swap)
+				goto keep_locked;
+
 			switch (try_to_unmap(page)) {
 			case SWAP_FAIL:
 				goto activate_locked;
_