linux-kernel - Re: [PATCH] mm: use a radix-tree to make do_move

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Message-ID: <48F06FA1.8060906@inria.fr>
Date:	Sat, 11 Oct 2008 11:19:29 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nathalie.furmento@...ri.fr
Subject: Re: [PATCH] mm: use a radix-tree to make do_move_pages() complexity
 linear

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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