linux-kernel - Re: [patch] rfc: introduce /dev/hugetlb

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Message-Id: <1174684134.10836.74.camel@localhost.localdomain>
Date:	Sat, 24 Mar 2007 08:08:54 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Adam Litke <agl@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] rfc: introduce /dev/hugetlb


> -#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
> -unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
> -		unsigned long len, unsigned long pgoff, unsigned long flags);
> -#else
> -static unsigned long
> +unsigned long
>  hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>  		unsigned long len, unsigned long pgoff, unsigned long flags)
>  {
> @@ -150,7 +145,6 @@ full_search:
>  		addr = ALIGN(vma->vm_end, HPAGE_SIZE);
>  	}
>  }
> -#endif

WTF ? get_unmapped_area() -has- to be arch in some platforms like
power...

I'm trying to improve the whole get_unmapped_area() to better handle
multiple constraints (cacheability, page size, ...) though I haven't
quite yet settled on an interface I like.

Ben.


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