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

Currently a single atomic variable is used to establish the size of the page
cache in the whole machine.  The zoned VM counters have the same method of
implementation as the nr_pagecache code but also allow the determination of
the pagecache size per zone.

Remove the special implementation for nr_pagecache and make it a zoned counter
named NR_FILE_PAGES.

Updates of the page cache counters are always performed with interrupts off.
We can therefore use the __ variant here.

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>

1 files changed, 1 insertions, 6 deletions

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4800091c129a..f16b33eb6d5c 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -20,12 +20,6 @@
  */
 DEFINE_PER_CPU(struct page_state, page_states) = {0};
 
-atomic_t nr_pagecache = ATOMIC_INIT(0);
-EXPORT_SYMBOL(nr_pagecache);
-#ifdef CONFIG_SMP
-DEFINE_PER_CPU(long, nr_pagecache_local) = 0;
-#endif
-
 static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
 {
         unsigned cpu;
@@ -402,6 +396,7 @@ struct seq_operations fragmentation_op = {
 static char *vmstat_text[] = {
         /* Zoned VM counters */
         "nr_mapped",
+        "nr_file_pages",
 
         /* Page state */
         "nr_dirty",