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authorAndrew Morton <akpm@osdl.org>2006-09-27 01:50:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-27 08:26:12 -0700
commite129b5c23c2b471d47f1c5d2b8b193fc2034af43 (patch)
tree78232266849d0f04b056b0f44554bcb476f0b8e1 /mm/vmscan.c
parentfb01439c5b778d5974a488c5d4fe85e6d0e18a68 (diff)
downloadlwn-e129b5c23c2b471d47f1c5d2b8b193fc2034af43.tar.gz
lwn-e129b5c23c2b471d47f1c5d2b8b193fc2034af43.zip
[PATCH] vm: add per-zone writeout counter
The VM is supposed to minimise the number of pages which get written off the LRU (for IO scheduling efficiency, and for high reclaim-success rates). But we don't actually have a clear way of showing how true this is. So add `nr_vmscan_write' to /proc/vmstat and /proc/zoneinfo - the number of pages which have been written by the vm scanner in this zone and globally. Cc: Christoph Lameter <clameter@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 87779dda4ec6..87d340999ce8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -19,6 +19,7 @@
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/highmem.h>
+#include <linux/vmstat.h>
#include <linux/file.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
@@ -370,7 +371,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
/* synchronous write or broken a_ops? */
ClearPageReclaim(page);
}
-
+ inc_zone_page_state(page, NR_VMSCAN_WRITE);
return PAGE_SUCCESS;
}