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authorChristoph Lameter <clameter@sgi.com>2006-06-30 12:55:36 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-30 22:25:35 +0400
commitf3dbd34460ff54962d3e3244b6bcb7f5295356e6 (patch)
tree91caae2b90d684a7640b5da451a9a2ff8a5c8fb8 /mm/page-writeback.c
parentbf02cf4b6cf931d060ad5c6ce9b960af6faefd2d (diff)
downloadlinux-f3dbd34460ff54962d3e3244b6bcb7f5295356e6.tar.xz
[PATCH] zoned vm counters: split NR_ANON_PAGES off from NR_FILE_MAPPED
The current NR_FILE_MAPPED is used by zone reclaim and the dirty load calculation as the number of mapped pagecache pages. However, that is not true. NR_FILE_MAPPED includes the mapped anonymous pages. This patch separates those and therefore allows an accurate tracking of the anonymous pages per zone. It then becomes possible to determine the number of unmapped pages per zone and we can avoid scanning for unmapped pages if there are none. Also it may now be possible to determine the mapped/unmapped ratio in get_dirty_limit. Isnt the number of anonymous pages irrelevant in that calculation? Note that this will change the meaning of the number of mapped pages reported in /proc/vmstat /proc/meminfo and in the per node statistics. This may affect user space tools that monitor these counters! NR_FILE_MAPPED works like NR_FILE_DIRTY. It is only valid for pagecache pages. 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>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 60c7244c42e4..0faacfe18909 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -111,7 +111,8 @@ static void get_writeback_state(struct writeback_state *wbs)
{
wbs->nr_dirty = read_page_state(nr_dirty);
wbs->nr_unstable = read_page_state(nr_unstable);
- wbs->nr_mapped = global_page_state(NR_FILE_MAPPED);
+ wbs->nr_mapped = global_page_state(NR_FILE_MAPPED) +
+ global_page_state(NR_ANON_PAGES);
wbs->nr_writeback = read_page_state(nr_writeback);
}