[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, 2 deletions

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 7535211bb49..fccbd9bba77 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -87,7 +87,7 @@ static int __add_to_swap_cache(struct page *page, swp_entry_t entry,
                         SetPageSwapCache(page);
                         set_page_private(page, entry.val);
                         total_swapcache_pages++;
-                        pagecache_acct(1);
+                        __inc_zone_page_state(page, NR_FILE_PAGES);
                 }
                 write_unlock_irq(&swapper_space.tree_lock);
                 radix_tree_preload_end();
@@ -132,7 +132,7 @@ void __delete_from_swap_cache(struct page *page)
         set_page_private(page, 0);
         ClearPageSwapCache(page);
         total_swapcache_pages--;
-        pagecache_acct(-1);
+        __dec_zone_page_state(page, NR_FILE_PAGES);
         INC_CACHE_INFO(del_total);
 }