Subject: Add debug checks to the page allocator

Some patches needed to track what is going wrong with the pcps using
cpu alloc.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2008-05-26 19:06:41.000000000 -0700
+++ linux-2.6/mm/page_alloc.c	2008-05-26 19:06:48.000000000 -0700
@@ -1009,6 +1009,7 @@
 	local_irq_save(flags);
 	pcp = &THIS_CPU(zone->pageset)->pcp;
 	__count_vm_event(PGFREE);
+	printk("free_hot_cold_page pageset=%p\n", pcp);
 	if (cold)
 		list_add_tail(&page->lru, &pcp->list);
 	else
@@ -2639,6 +2640,7 @@
 {
 	struct per_cpu_pages *pcp;
 
+	printk("Setup pageset %p batch=%d\n", p, batch);
 	memset(p, 0, sizeof(*p));
 
 	pcp = &p->pcp;
@@ -2682,6 +2684,7 @@
 		if (!populated_zone(zone))
 			continue;
 
+		printk("process zones: Initializing pageset zone=%p\n",zone);
 		setup_pageset(pcp, zone_batchsize(zone));
 
 		if (percpu_pagelist_fraction)
@@ -2772,6 +2775,7 @@
 
 static __meminit void zone_pcp_init(struct zone *zone)
 {
+	printk("zone_pcp_init: Initializing pageset zone=%p\n", zone);
 	zone->pageset = CPU_ALLOC(struct per_cpu_pageset, GFP_KERNEL);
 	/*
 	 * Provisional setup of local pageset so that we can get through