Extend per node and per zone statistics by printing the additional counters now available.

- Add new counters to per node statistics

- Add new counters to per zone statistics

- Provide an array describing zoned VM counters

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

Index: linux-2.6.17-rc6-mm1/drivers/base/node.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/drivers/base/node.c	2006-06-08 14:29:45.931956736 -0700
+++ linux-2.6.17-rc6-mm1/drivers/base/node.c	2006-06-08 14:57:17.733967150 -0700
@@ -44,12 +44,14 @@ static ssize_t node_read_meminfo(struct 
 	unsigned long inactive;
 	unsigned long active;
 	unsigned long free;
-	unsigned long nr_mapped;
+	int j;
+	unsigned long nr[NR_STAT_ITEMS];
 
 	si_meminfo_node(&i, nid);
 	get_page_state_node(&ps, nid);
 	__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
-	nr_mapped = node_page_state(nid, NR_MAPPED);
+	for (j = 0; j < NR_STAT_ITEMS; j++)
+		nr[j] = node_page_state(nid, j);
 
 	/* Check for negative values in these approximate counters */
 	if ((long)ps.nr_dirty < 0)
@@ -72,6 +74,7 @@ static ssize_t node_read_meminfo(struct 
 		       "Node %d Dirty:        %8lu kB\n"
 		       "Node %d Writeback:    %8lu kB\n"
 		       "Node %d Mapped:       %8lu kB\n"
+		       "Node %d Pagecache:    %8lu kB\n"
 		       "Node %d Slab:         %8lu kB\n",
 		       nid, K(i.totalram),
 		       nid, K(i.freeram),
@@ -84,7 +87,8 @@ static ssize_t node_read_meminfo(struct 
 		       nid, K(i.freeram - i.freehigh),
 		       nid, K(ps.nr_dirty),
 		       nid, K(ps.nr_writeback),
-		       nid, K(nr_mapped),
+		       nid, K(nr[NR_MAPPED]),
+		       nid, K(nr[NR_PAGECACHE]),
 		       nid, K(ps.nr_slab));
 	n += hugetlb_report_node_meminfo(nid, buf + n);
 	return n;
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 14:29:46.317675014 -0700
+++ linux-2.6.17-rc6-mm1/mm/page_alloc.c	2006-06-08 14:57:05.712250246 -0700
@@ -628,6 +628,8 @@ static int rmqueue_bulk(struct zone *zon
 	return i;
 }
 
+char *vm_stat_item_descr[NR_STAT_ITEMS] = { "mapped","pagecache" };
+
 /*
  * Manage combined zone based / global counters
  *
@@ -2724,6 +2726,11 @@ static int zoneinfo_show(struct seq_file
 			   zone->nr_scan_active, zone->nr_scan_inactive,
 			   zone->spanned_pages,
 			   zone->present_pages);
+		for(i = 0; i < NR_STAT_ITEMS; i++)
+			seq_printf(m, "\n        %-8s %lu",
+					vm_stat_item_descr[i],
+					zone_page_state(zone, i));
+
 		seq_printf(m,
 			   "\n        protection: (%lu",
 			   zone->lowmem_reserve[0]);