[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, 0 insertions, 5 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 04dd2b01b2b7..8350720f98a8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2124,16 +2124,11 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
                                  unsigned long action, void *hcpu)
 {
         int cpu = (unsigned long)hcpu;
-        long *count;
         unsigned long *src, *dest;
 
         if (action == CPU_DEAD) {
                 int i;
 
-                /* Drain local pagecache count. */
-                count = &per_cpu(nr_pagecache_local, cpu);
-                atomic_add(*count, &nr_pagecache);
-                *count = 0;
                 local_irq_disable();
                 __drain_pages(cpu);