Add zoned counters to /proc/vmstat

This makes vmstat print counters from a combined array of zoned counters
plus the current page_state (which will be later be replaced by the
event counter patchset).

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

Index: linux-2.6.17-rc6-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/page_alloc.c	2006-06-08 13:51:16.145258328 -0700
+++ linux-2.6.17-rc6-mm1/mm/page_alloc.c	2006-06-08 13:53:18.336915650 -0700
@@ -2800,6 +2800,9 @@ struct seq_operations zoneinfo_op = {
 };
 
 static char *vmstat_text[] = {
+	/* Zoned VM counters */
+
+	/* Page state */
 	"nr_dirty",
 	"nr_writeback",
 	"nr_unstable",
@@ -2857,19 +2860,25 @@ static char *vmstat_text[] = {
 
 static void *vmstat_start(struct seq_file *m, loff_t *pos)
 {
+	unsigned long *v;
 	struct page_state *ps;
+	int i;
 
 	if (*pos >= ARRAY_SIZE(vmstat_text))
 		return NULL;
 
-	ps = kmalloc(sizeof(*ps), GFP_KERNEL);
-	m->private = ps;
-	if (!ps)
+	v = kmalloc(NR_STAT_ITEMS * sizeof(unsigned long)
+			+ sizeof(struct page_state), GFP_KERNEL);
+	m->private = v;
+	if (!v)
 		return ERR_PTR(-ENOMEM);
+	for (i = 0; i < NR_STAT_ITEMS; i++)
+		v[i] = global_page_state(i);
+	ps = (struct page_state *)(v + NR_STAT_ITEMS);
 	get_full_page_state(ps);
 	ps->pgpgin /= 2;		/* sectors -> kbytes */
 	ps->pgpgout /= 2;
-	return (unsigned long *)ps + *pos;
+	return v + *pos;
 }
 
 static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)