From: Andrew Morton <akpm@osdl.org>
Date: Wed, 27 Sep 2006 08:50:00 +0000 (-0700)
Subject: [PATCH] vm: add per-zone writeout counter
X-Git-Tag: v2.6.19-rc1~975
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e129b5c23c2b471d47f1c5d2b8b193fc2034af43;p=pandora-kernel.git

[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>
---

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