linux-kernel - Re: Slab allocators: Define common size limitations

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Message-ID: <Pine.LNX.4.62.0705160855470.24080@pademelon.sonytel.be>
Date:	Wed, 16 May 2007 08:58:39 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Christoph Lameter <clameter@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Linux/PPC Development <linuxppc-dev@...abs.org>
Subject: Re: Slab allocators: Define common size limitations

On Tue, 15 May 2007, Christoph Lameter wrote:
> So define a common maximum size for kmalloc. For conveniences sake
> we use the maximum size ever supported which is 32 MB. We limit the maximum
> size to a lower limit if MAX_ORDER does not allow such large allocations.

What are the changes a large allocation will actually succeed?
Is there an alignment rule for large allocations?

E.g. for one of the PS3 drivers I need a physically contiguous 256 KiB-aligned
block of 256 KiB. Currently I'm using __alloc_bootmem() for that, but maybe
kmalloc() becomes a suitable alternative now?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- Sony Network and Software Technology Center Europe (NSCE)
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