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

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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>
This commit is contained in:
Christoph Lameter
2006-06-30 01:55:34 -07:00
committed by Linus Torvalds
parent 2244b95a7b
commit 65ba55f500
10 changed files with 16 additions and 17 deletions
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2
mm/page-writeback.c
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@@ -111,7 +111,7 @@ 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 = read_page_state(nr_mapped);
wbs->nr_mapped = global_page_state(NR_FILE_MAPPED);
wbs->nr_writeback = read_page_state(nr_writeback);
}