From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <48F06FA1.8060906@inria.fr> Date: Sat, 11 Oct 2008 11:19:29 +0200 From: Brice Goglin MIME-Version: 1.0 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> In-Reply-To: <200810111958.12848.nickpiggin@yahoo.com.au> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: Christoph Lameter , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, nathalie.furmento@labri.fr List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org