[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, 2 insertions, 1 deletions

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index bc7d9abca743..1af12fd77fe6 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -142,7 +142,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
         allowed = ((totalram_pages - hugetlb_total_pages())
                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 
-        cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
+        cached = global_page_state(NR_FILE_PAGES) -
+                        total_swapcache_pages - i.bufferram;
         if (cached < 0)
                 cached = 0;