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| author | Andrew Morton <akpm@osdl.org> | 2006-09-27 01:50:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-27 08:26:12 -0700 |
| commit | e129b5c23c2b471d47f1c5d2b8b193fc2034af43 (patch) | |
| tree | 78232266849d0f04b056b0f44554bcb476f0b8e1 | |
| parent | fb01439c5b778d5974a488c5d4fe85e6d0e18a68 (diff) | |
| download | lwn-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>
| -rw-r--r-- | include/linux/mmzone.h | 1 | ||||
| -rw-r--r-- | mm/vmscan.c | 3 | ||||
| -rw-r--r-- | mm/vmstat.c | 1 |
3 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 7fa1cbe9fa7a..1b0680cd84d2 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -58,6 +58,7 @@ enum zone_stat_item { NR_WRITEBACK, NR_UNSTABLE_NFS, /* NFS unstable pages */ NR_BOUNCE, + NR_VMSCAN_WRITE, #ifdef CONFIG_NUMA NUMA_HIT, /* allocated in intended node */ NUMA_MISS, /* allocated in non intended node */ 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; } diff --git a/mm/vmstat.c b/mm/vmstat.c index 490d8c1a0ded..69c657132e1f 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -465,6 +465,7 @@ static char *vmstat_text[] = { "nr_writeback", "nr_unstable", "nr_bounce", + "nr_vmscan_write", #ifdef CONFIG_NUMA "numa_hit", |