[PATCH] zoned vm counters: conversion of nr_dirty to per zone counter

This makes nr_dirty a per zone counter.  Looping over all processors is
avoided during writeback state determination.

The counter aggregation for nr_dirty had to be undone in the NFS layer since
we summed up the page counts from multiple zones.  Someone more familiar with
NFS should probably review what I have done.

[akpm@osdl.org: bugfix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 292a35f..1982fb5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -400,9 +400,9 @@
 	"nr_file_pages",
 	"nr_slab",
 	"nr_page_table_pages",
+	"nr_dirty",
 
 	/* Page state */
-	"nr_dirty",
 	"nr_writeback",
 	"nr_unstable",