Unevictable LRU Page Statistics

Report unevictable pages per zone and system wide.

Kosaki Motohiro added support for memory controller unevictable
statistics.

[riel@redhat.com: fix printk in show_free_areas()]
[akpm@linux-foundation.org: fix units in /proc/vmstats]
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Debugged-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/vmstat.c

@@ -623,6 +623,9 @@ static const char * const vmstat_text[] = {
 	"nr_active_anon",
 	"nr_inactive_file",
 	"nr_active_file",
+#ifdef CONFIG_UNEVICTABLE_LRU
+	"nr_unevictable",
+#endif
 	"nr_anon_pages",
 	"nr_mapped",
 	"nr_file_pages",