Display vma mlocked state and page counts

Pages in mlocked VMAs are not subject to page migration, so its important
to know if a VMA was mlocked. Also page counts may indicate xpmem being active
in a vma.

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

Index: linux-2.6.16-rc6/mm/mempolicy.c
===================================================================
--- linux-2.6.16-rc6.orig/mm/mempolicy.c	2006-03-11 14:12:55.000000000 -0800
+++ linux-2.6.16-rc6/mm/mempolicy.c	2006-03-17 18:26:05.000000000 -0800
@@ -1758,6 +1776,8 @@ struct numa_maps {
 	unsigned long mapcount_max;
 	unsigned long dirty;
 	unsigned long swapcache;
+	unsigned long min_pagecount;
+	unsigned long max_pagecount;
 	unsigned long node[MAX_NUMNODES];
 };
 
@@ -1785,6 +1805,13 @@ static void gather_stats(struct page *pa
 	if (count > md->mapcount_max)
 		md->mapcount_max = count;
 
+	count = page_count(page);
+	if (count > md->max_pagecount)
+		md->max_pagecount = count;
+
+	if (!md->min_pagecount || count < md->min_pagecount)
+		md->min_pagecount = count;
+
 	md->node[page_to_nid(page)]++;
 	cond_resched();
 }
@@ -1863,9 +1890,13 @@ int show_numa_map(struct seq_file *m, vo
 				&node_online_map, MPOL_MF_STATS, md);
 	}
 
+	if (vma->vm_flags & VM_LOCKED)
+		seq_printf(m, " locked");
+
 	if (!md->pages)
 		goto out;
 
+
 	if (md->anon)
 		seq_printf(m," anon=%lu",md->anon);
 
@@ -1887,6 +1918,9 @@ int show_numa_map(struct seq_file *m, vo
 	if (md->writeback)
 		seq_printf(m," writeback=%lu", md->writeback);
 
+	if (md->min_pagecount > 2 || md->max_pagecount > 1 + md->mapcount_max)
+		seq_printf(m," pc=%lu-%lu", md->min_pagecount, md->max_pagecount);
+
 	for_each_online_node(n)
 		if (md->node[n])
 			seq_printf(m, " N%d=%lu", n, md->node[n]);