commit 65ba55f500a37272985d071c9bbb35256a2f7c14
author Christoph Lameter <clameter@sgi.com> Fri Jun 30 01:55:34 2006 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> Fri Jun 30 11:25:34 2006 -0700
tree e7735326ef2d2dca9d00a6c5ae47e9eb03c7834f
parent 2244b95a7bcf8d24196f8a3a44187ba5dfff754c

[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>