Message-ID: <48F06FA1.8060906@inria.fr>
Date: Sat, 11 Oct 2008 11:19:29 +0200
From: Brice Goglin <Brice.Goglin@inria.fr>
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To: Nick Piggin <nickpiggin@yahoo.com.au>
CC: Christoph Lameter <cl@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, nathalie.furmento@labri.fr
Subject: Re: [PATCH] mm: use a radix-tree to make do_move_pages() complexity
 linear
References: <48EDF9DA.7000508@inria.fr> <48EFBBE9.5000703@linux-foundation.org> <48F069B8.6050709@inria.fr> <200810111958.12848.nickpiggin@yahoo.com.au>
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Nick Piggin wrote:
> If you are worried about vmalloc overhead, I'd suggest testing with -mm.
> I've rewritten the vmap code so it is now slightly scalable and sane to
> use.
>   

I am actually only worried about move_pages() performance for large
buffers :) The vmalloc overhead is probably negligible against the
quadratic duration of move_pages() for dozens of MB.

Brice

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