Unreclaimable pages: Add ZVC for file backed pages and unreclaimable anon pages.

Add a ZVC for unreclaimable file backed pages and unreclaimable
anonymous pages.

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

Index: linux-2.6/include/linux/mmzone.h
===================================================================
--- linux-2.6.orig/include/linux/mmzone.h	2007-07-31 18:43:17.000000000 -0700
+++ linux-2.6/include/linux/mmzone.h	2007-07-31 18:43:31.000000000 -0700
@@ -55,17 +55,17 @@ struct zone_padding {
 #endif
 
 enum zone_stat_item {
-	/* First 128 byte cacheline (assuming 64 bit words) */
 	NR_FREE_PAGES,
 	NR_INACTIVE,
 	NR_ACTIVE,
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_ANON_PAGES,		/* Mapped anonymous pages */
+	NR_ANON_UNRECLAIMABLE,	/* Unreclaimable mlock? */
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
 			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
+	NR_FILE_UNRECLAIMABLE,	/* Unreclaimable -> ramfs ? */
 	NR_WRITEBACK,
-	/* Second 128 byte cacheline */
 	NR_SLAB_RECLAIMABLE,
 	NR_SLAB_UNRECLAIMABLE,
 	NR_PAGETABLE,		/* used for pagetables */
Index: linux-2.6/mm/vmstat.c
===================================================================
--- linux-2.6.orig/mm/vmstat.c	2007-07-31 18:43:17.000000000 -0700
+++ linux-2.6/mm/vmstat.c	2007-07-31 18:43:31.000000000 -0700
@@ -481,8 +481,10 @@ static const char * const vmstat_text[] 
 	"nr_inactive",
 	"nr_active",
 	"nr_anon_pages",
+	"nr_anon_unreclaimable",
 	"nr_mapped",
 	"nr_file_pages",
+	"nr_file_unreclaimable",
 	"nr_dirty",
 	"nr_writeback",
 	"nr_slab_reclaimable",