From: Brice Goglin <Brice.Goglin@inria.fr>
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
Date: Sat, 11 Oct 2008 11:19:29 +0200 [thread overview]
Message-ID: <48F06FA1.8060906@inria.fr> (raw)
In-Reply-To: <200810111958.12848.nickpiggin@yahoo.com.au>
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
WARNING: multiple messages have this Message-ID (diff)
From: Brice Goglin <Brice.Goglin@inria.fr>
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
Date: Sat, 11 Oct 2008 11:19:29 +0200 [thread overview]
Message-ID: <48F06FA1.8060906@inria.fr> (raw)
In-Reply-To: <200810111958.12848.nickpiggin@yahoo.com.au>
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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next prev parent reply other threads:[~2008-10-11 9:20 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-09 12:32 [PATCH] mm: use a radix-tree to make do_move_pages() complexity linear Brice Goglin
2008-10-09 12:32 ` Brice Goglin
2008-10-10 19:50 ` Andrew Morton
2008-10-10 19:50 ` Andrew Morton
2008-10-10 20:11 ` Brice Goglin
2008-10-10 20:11 ` Brice Goglin
2008-10-10 20:32 ` Christoph Lameter
2008-10-10 20:32 ` Christoph Lameter
2008-10-11 8:54 ` Brice Goglin
2008-10-11 8:54 ` Brice Goglin
2008-10-11 8:58 ` Nick Piggin
2008-10-11 8:58 ` Nick Piggin
2008-10-11 9:19 ` Brice Goglin [this message]
2008-10-11 9:19 ` Brice Goglin
2008-10-13 16:09 ` Christoph Lameter
2008-10-13 16:09 ` Christoph Lameter
2008-10-10 20:59 ` Brice Goglin
2008-10-10 20:59 ` Brice Goglin
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