[PATCH] zoned vm counters: convert nr_mapped to per zone counter

nr_mapped is important because it allows a determination of how many pages of
a zone are not mapped, which would allow a more efficient means of determining
when we need to reclaim memory in a zone.

We take the nr_mapped field out of the page state structure and define a new
per zone counter named NR_FILE_MAPPED (the anonymous pages will be split off
from NR_MAPPED in the next patch).

We replace the use of nr_mapped in various kernel locations.  This avoids the
looping over all processors in try_to_free_pages(), writeback, reclaim (swap +
zone reclaim).

[akpm@osdl.org: bugfix]
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, 1 insertions, 1 deletions

diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c
index 2889567e21a1..f85f1a40e5c8 100644
--- a/arch/i386/mm/pgtable.c
+++ b/arch/i386/mm/pgtable.c
@@ -61,7 +61,7 @@ void show_mem(void)
         get_page_state(&ps);
         printk(KERN_INFO "%lu pages dirty\n", ps.nr_dirty);
         printk(KERN_INFO "%lu pages writeback\n", ps.nr_writeback);
-        printk(KERN_INFO "%lu pages mapped\n", ps.nr_mapped);
+        printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
         printk(KERN_INFO "%lu pages slab\n", ps.nr_slab);
         printk(KERN_INFO "%lu pages pagetables\n", ps.nr_page_table_pages);
 }