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authorChandra Seetharaman <sekharan@us.ibm.com>2006-09-29 02:01:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:22 -0700
commit40c99aae23529f3d069ae08836ae46fadb3fd2bd (patch)
tree5172ca1dca669de3ddc2a6aacc79e41667204aea /mm
parent153dcc54df826d2f8413c026313cba673c6bcc5b (diff)
downloadconfigs-40c99aae23529f3d069ae08836ae46fadb3fd2bd.tar.gz
[PATCH] remove static variable mm/page-writeback.c:total_pages
page-writeback.c has a static local variable "total_pages", which is the total number of pages in the system. There is a global variable "vm_total_pages", which is the total number of pages the VM controls. Both are assigned from the return value of nr_free_pagecache_pages(). This patch removes the local variable and uses the global variable in that place. One more issue with the local static variable "total_pages" is that it is not updated when new pages are hot-added. Since vm_total_pages is updated when new pages are hot-added, this patch fixes that problem too. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page-writeback.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 555752907dc..efd2705e498 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -46,7 +46,6 @@
*/
static long ratelimit_pages = 32;
-static long total_pages; /* The total number of pages in the machine. */
static int dirty_exceeded __cacheline_aligned_in_smp; /* Dirty mem may be over limit */
/*
@@ -126,7 +125,7 @@ get_dirty_limits(long *pbackground, long *pdirty,
int unmapped_ratio;
long background;
long dirty;
- unsigned long available_memory = total_pages;
+ unsigned long available_memory = vm_total_pages;
struct task_struct *tsk;
#ifdef CONFIG_HIGHMEM
@@ -141,7 +140,7 @@ get_dirty_limits(long *pbackground, long *pdirty,
unmapped_ratio = 100 - ((global_page_state(NR_FILE_MAPPED) +
global_page_state(NR_ANON_PAGES)) * 100) /
- total_pages;
+ vm_total_pages;
dirty_ratio = vm_dirty_ratio;
if (dirty_ratio > unmapped_ratio / 2)
@@ -504,7 +503,7 @@ void laptop_sync_completion(void)
static void set_ratelimit(void)
{
- ratelimit_pages = total_pages / (num_online_cpus() * 32);
+ ratelimit_pages = vm_total_pages / (num_online_cpus() * 32);
if (ratelimit_pages < 16)
ratelimit_pages = 16;
if (ratelimit_pages * PAGE_CACHE_SIZE > 4096 * 1024)
@@ -533,9 +532,7 @@ void __init page_writeback_init(void)
long buffer_pages = nr_free_buffer_pages();
long correction;
- total_pages = nr_free_pagecache_pages();
-
- correction = (100 * 4 * buffer_pages) / total_pages;
+ correction = (100 * 4 * buffer_pages) / vm_total_pages;
if (correction < 100) {
dirty_background_ratio *= correction;