linux-kernel - Re: [PATCH -mm] mm: more likely reclaim MADV

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Message-ID: <20080721111412.0bfcd09b@bree.surriel.com>
Date:	Mon, 21 Jul 2008 11:14:12 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Johannes Weiner" <hannes@...urebad.de>,
	"Peter Zijlstra" <peterz@...radead.org>,
	Nossum <vegard.nossum@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] mm: more likely reclaim MADV_SEQUENTIAL mappings

On Mon, 21 Jul 2008 15:49:00 +1000
Nick Piggin <nickpiggin@...oo.com.au> wrote:

> It is already bad because: if you are doing a big streaming copy
> which you know is going to blow the cache and not be used again,
> then you should be unmapping behind you as you go.

MADV_SEQUENTIAL exists for a reason.

If you think that doing an automatic unmap-behind will be
a better way to go, we can certainly whip up a patch for
that...

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