[PATCH] kswapd shall not sleep during page shortage

[Marcelo Tosatti <marcelo.tosatti@cyclades.com>]

Andrew,

I was wrong last time I read balance_pgdat() when I thought kswapd
couldnt sleep under page shortage. 

It can, because all_zones_ok is set to "1" inside the 
"priority=DEF_PRIORITY; priority >= 0; priority--" loop.

So this patch sets "all_zones_ok" to zero even if all_unreclaimable 
is set, avoiding it from sleeping when zones are under page short.

Please apply!


--- linux-2.6.10-rc1-mm2/mm/vmscan.c.orig	2004-11-09 16:38:04.480873424 -0200
+++ linux-2.6.10-rc1-mm2/mm/vmscan.c	2004-11-09 16:38:08.624243536 -0200
@@ -1033,15 +1033,17 @@
 				if (zone->present_pages == 0)
 					continue;
 
-				if (zone->all_unreclaimable &&
-						priority != DEF_PRIORITY)
-					continue;
-
 				if (!zone_watermark_ok(zone, order,
 						zone->pages_high, 0, 0, 0)) {
 					end_zone = i;
-					goto scan;
+					all_zones_ok = 0;
 				}
+
+				if (zone->all_unreclaimable &&
+						priority != DEF_PRIORITY)
+					continue;
+
+				goto scan;
 			}
 			goto out;
 		} else {
--
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