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authorChristoph Lameter <clameter@sgi.com>2006-06-30 01:55:34 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-30 11:25:34 -0700
commit65ba55f500a37272985d071c9bbb35256a2f7c14 (patch)
treee7735326ef2d2dca9d00a6c5ae47e9eb03c7834f /include/linux/mmzone.h
parent2244b95a7bcf8d24196f8a3a44187ba5dfff754c (diff)
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[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>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 543f9e4..eb42c12 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -47,6 +47,9 @@ struct zone_padding {
#endif
enum zone_stat_item {
+ NR_FILE_MAPPED, /* mapped into pagetables.
+ only modified from process context */
+
NR_VM_ZONE_STAT_ITEMS };
struct per_cpu_pages {
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