Index: linux-2.6.8-rc1/mm/truncate.c
===================================================================
--- linux-2.6.8-rc1.orig/mm/truncate.c	2004-07-15 02:41:41.000000000 +1000
+++ linux-2.6.8-rc1/mm/truncate.c	2004-07-15 10:03:41.610805718 +1000
@@ -155,6 +155,7 @@
 
 	next = start;
 	for ( ; ; ) {
+		cond_resched();
 		if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
 			if (next == start)
 				break;