linux-kernel - Re: [PATCH] 2.6.26-rc: x86: pci-dma.c: use __GFP_NO_OOM instead of __GFP

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Date:	Mon, 2 Jun 2008 12:15:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Miquel van Smoorenburg <mikevs@...all.net>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] 2.6.26-rc: x86: pci-dma.c: use __GFP_NO_OOM instead of
	__GFP_NORETRY


* Miquel van Smoorenburg <mikevs@...all.net> wrote:

> Okay, so how about this then ?
> 
> --- linux-2.6.26-rc4.orig/arch/x86/kernel/pci-dma.c	2008-05-26 20:08:11.000000000 +0200
> +++ linux-2.6.26-rc4/arch/x86/kernel/pci-dma.c	2008-05-28 10:27:41.000000000 +0200
> @@ -397,9 +397,6 @@
>  	if (dev->dma_mask == NULL)
>  		return NULL;
>  
> -	/* Don't invoke OOM killer */
> -	gfp |= __GFP_NORETRY;
> -
>  #ifdef CONFIG_X86_64
>  	/* Why <=? Even when the mask is smaller than 4GB it is often
>  	   larger than 16MB and in this case we have a chance of
> @@ -410,7 +407,9 @@
>  #endif
>  
>   again:
> -	page = dma_alloc_pages(dev, gfp, get_order(size));
> +	/* Don't invoke OOM killer or retry in lower 16MB DMA zone */
> +	page = dma_alloc_pages(dev,
> +		(gfp & GFP_DMA) ? gfp | __GFP_NORETRY : gfp, get_order(size));
>  	if (page == NULL)
>  		return NULL;

applied to tip/pci-for-jesse for more testing. Thanks,

	Ingo
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