---
 mm/page_alloc.c |    3 +++
 mm/slub.c       |    1 +
 2 files changed, 4 insertions(+)

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2008-03-17 12:39:44.597833744 -0700
+++ linux-2.6/mm/page_alloc.c	2008-03-17 15:09:22.582746591 -0700
@@ -1477,6 +1477,9 @@ __alloc_pages(gfp_t gfp_mask, unsigned i
 	if (should_fail_alloc_page(gfp_mask, order))
 		return NULL;
 
+	/* 50% of order 3 allocs fail */
+	if (order == 3 && system_state == SYSTEM_RUNNING && (jiffies % 2))
+		return NULL;
 restart:
 	z = zonelist->zones;  /* the list of zones suitable for gfp_mask */
 
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2008-03-17 15:09:19.930700085 -0700
+++ linux-2.6/mm/slub.c	2008-03-17 15:09:22.586746882 -0700
@@ -1057,6 +1057,7 @@ static struct page *allocate_slab(struct
 		 * Allocation may have failed due to fragmentation.
 		 * Try a lower order alloc if possible
 		 */
+		printk("SLUB: Fallback for %s\n", s->name);
 		page = alloc_slab_page(flags, node, get_order(s->size));
 		if (page) {
 			pages = 1 << compound_order(page);