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

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Message-ID: <Pine.LNX.4.62.0705171044030.1803@pademelon.sonytel.be>
Date:	Thu, 17 May 2007 10:45:00 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linuxppc-dev@...abs.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: Slab allocators: Define common size limitations

On Wed, 16 May 2007, Arnd Bergmann wrote:
> On Wednesday 16 May 2007, Geert Uytterhoeven wrote:
> > 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?
> 
> kmalloc is limited to 128KiB on most architectures. Normally there is no
> need to use it anyway, just use __get_free_pages(). It will generally
> succeed at early boot time, but not after the system has been running
> for some time.

Exactly my understanding. And __get_free_pages() returns PAGE_SIZE-aligned
memory. So I'll keep the current code.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- Sony Network and Software Technology Center Europe (NSCE)
Geert.Uytterhoeven@...ycom.com ------- The Corporate Village, Da Vincilaan 7-D1
Voice +32-2-7008453 Fax +32-2-7008622 ---------------- B-1935 Zaventem, Belgium
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