linux-kernel - Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped pages from reclaim

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Message-ID: <alpine.DEB.1.10.0905121801080.19973@qirst.com>
Date:	Tue, 12 May 2009 18:02:21 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped
 pages from reclaim

On Tue, 12 May 2009, Rik van Riel wrote:

> > Streaming I/O means access once?
>
> Yeah, "used-once pages" would be a better criteria, since
> you could go through a gigantic set of used-once pages without
> doing linear IO.

Can we see some load for which this patch has a beneficial effect?
With some numbers?

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