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[PATCH] vm: add per-zone writeout counter

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2006-09-27 01:50:00 -07:00 • committed by Linus Torvalds
commit e129b5c23c
3 changed files with 4 additions and 1 deletions
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1
mm/vmstat.c
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@ -465,6 +465,7 @@ static char *vmstat_text[] = {
"nr_writeback",
"nr_unstable",
"nr_bounce",
"nr_vmscan_write",
#ifdef CONFIG_NUMA
"numa_hit",