[PATCH] zone_reclaim: do not unmap file backed pages

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 61ca009..8277f93 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -477,6 +477,12 @@
 		 * 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;