linux-kernel - Re: [PATCH 4/5] add isolate pages vmstat

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Date:	Thu, 9 Jul 2009 17:00:01 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 4/5] add isolate pages vmstat

On Thu, 9 Jul 2009, KOSAKI Motohiro wrote:

> >
> > Could you move the counters for reclaim into a separate cacheline?
> >
>
> Current definition is here.
>
> dirty pages and other frequently used counter stay in first cache line.
> NR_ISOLATED_(ANON|FILE) and other unfrequently used counter stay in second
> cache line.
>
> Do you mean we shouldn't use zone_stat_item for it?

No there is really no alternative to it.

Just be aware that what you may increases the cache footprint of key
functions in the vm. Some regression tests would be useful (do a page
fault test etc).
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