Commit e129b5c2 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[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: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent fb01439c
......@@ -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 */
......
......@@ -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;
}
......
......@@ -465,6 +465,7 @@ static char *vmstat_text[] = {
"nr_writeback",
"nr_unstable",
"nr_bounce",
"nr_vmscan_write",
#ifdef CONFIG_NUMA
"numa_hit",
......
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