diff --git a/init/main.c b/init/main.c
index 7449819..98cfaae 100644
--- a/init/main.c
+++ b/init/main.c
@@ -369,6 +369,10 @@ static void __init setup_nr_cpu_ids(void)
 	nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
 }
 
+#include <linux/ext3_fs_i.h>
+#include <linux/skbuff.h>
+#include <linux/sched.h>
+
 /* Called by boot processor to activate the rest. */
 static void __init smp_init(void)
 {
@@ -391,6 +395,15 @@ static void __init smp_init(void)
 	/* Any cleanup work */
 	printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
 	smp_cpus_done(setup_max_cpus);
+
+	printk(KERN_DEBUG "sizeof(vma)=%u bytes\n", (unsigned int) sizeof(struct vm_area_struct));
+	printk(KERN_DEBUG "sizeof(page)=%u bytes\n", (unsigned int) sizeof(struct page));
+	printk(KERN_DEBUG "sizeof(inode)=%u bytes\n", (unsigned int) sizeof(struct inode));
+	printk(KERN_DEBUG "sizeof(dentry)=%u bytes\n", (unsigned int) sizeof(struct dentry));
+	printk(KERN_DEBUG "sizeof(ext3inode)=%u bytes\n", (unsigned int) sizeof(struct ext3_inode_info));
+	printk(KERN_DEBUG "sizeof(buffer_head)=%u bytes\n", (unsigned int) sizeof(struct buffer_head));
+	printk(KERN_DEBUG "sizeof(skbuff)=%u bytes\n", (unsigned int) sizeof(struct sk_buff));
+	printk(KERN_DEBUG "sizeof(task_struct)=%u bytes\n", (unsigned int) sizeof(struct task_struct));
 }
 
 #endif