---
 mm/slub.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2008-01-10 00:02:48.357282213 -0800
+++ linux-2.6/mm/slub.c	2008-01-10 00:32:35.336299123 -0800
@@ -2986,6 +2986,8 @@ static int slab_memory_callback(struct n
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
+#define BOUNDARY_PERCENT 30
+
 /********************************************************************
  *			Basic setup of slabs
  *******************************************************************/
@@ -2995,6 +2997,23 @@ void __init kmem_cache_init(void)
 	int i;
 	int caches = 0;
 
+#ifdef CONFIG_HUGETLBFS
+	/*
+	 * Check if we should go into a huge page configuration. We do that if
+	 * a huge slab configuration would use less than 5% of system memory.
+	 * The memory use of a huge slab configuration is mainly driven by the
+	 * number of cpu slabs needed for each slab on each processors. A huge
+	 * page configuration can need up to about 100 huge pages
+	 * per processor. That is around 200MB on a 4k platform. So a system
+	 * must have more or equal to 4GB per processor for this to trigger.
+	 */
+	if (!slub_min_order &&
+		(100 << (HPAGE_SHIFT - PAGE_SHIFT)) * nr_cpu_ids <=
+				totalram_pages * BOUNDARY_PERCENT / 100) {
+		slub_min_order = HPAGE_SHIFT - PAGE_SHIFT;
+#endif
+
+
 	init_alloc_cpu();
 
 #ifdef CONFIG_NUMA