linux-kernel - Re: [RFC] Initial alpha-0 for new page allocator API

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Date:	Fri, 22 Sep 2006 14:01:48 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Jesse Barnes <jesse.barnes@...el.com>
cc:	Martin Bligh <mbligh@...igh.org>, Andi Kleen <ak@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, akpm@...gle.com,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...eleye.com>,
	linux-mm@...ck.org
Subject: Re: [RFC] Initial alpha-0 for new page allocator API

On Fri, 22 Sep 2006, Jesse Barnes wrote:

> > +	if (dev->coherent_dma_mask < 0xffffffff)
> > +		high = dev->coherent_dma_mask;
> 
> With your alloc_pages_range this check can go away.  I think only the dev 
> == NULL check is needed with this scheme since it looks like there's no 
> way (currently) for ISA devices to store their masks for later 
> consultation by arch code? 

This check is necessary to set up the correct high boundary for 
alloc_page_range.

> > +	if (high == -1L && low == 0L)
> > +		return alloc_pages(gfp_flags, order);
> 
> There's max_pfn, but on machines with large memory holes using it might not 
> help much.

I found node_start_pfn and node_spanned_pages in the node structure. That 
gives me the boundaries for a node and I think I can work with that.
 
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