linux-kernel - Re: 2.6.26: x86/kernel/pci_dma.c: gfp |= __GFP

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Message-ID: <20080525230216.1fe1b216@core>
Date:	Sun, 25 May 2008 23:02:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Miquel van Smoorenburg <miquels@...tron.nl>,
	Glauber Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	andi-suse@...stfloor.org
Subject: Re: 2.6.26: x86/kernel/pci_dma.c: gfp |= __GFP_NORETRY ?

> No it doesn't because the lower zone protection basically never puts
> anything that is not GFP_DMA into the 16MB zone.
> 
> Just check yourself on your machine using sysrq.
> 
> That was one of the motivations behind the mask allocator design.

Try a 16MB embedded PC 

Alan
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