Date: Mon, 21 Jul 2008 11:14:12 -0400
From: Rik van Riel <riel@redhat.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
       "Johannes Weiner" <hannes@saeurebad.de>,
       "Peter Zijlstra" <peterz@infradead.org>,
       Nossum <vegard.nossum@gmail.com>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH -mm] mm: more likely reclaim MADV_SEQUENTIAL mappings
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On Mon, 21 Jul 2008 15:49:00 +1000
Nick Piggin <nickpiggin@yahoo.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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