linux-kernel - Re: pagetable_ops: Hugetlb character device example

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Date:	Wed, 21 Mar 2007 16:35:28 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Valdis.Kletnieks@...edu, Adam Litke <agl@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ken Chen <kenchen@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: pagetable_ops: Hugetlb character device example

On Wed, Mar 21, 2007 at 03:26:59PM -0700, William Lee Irwin III wrote:
>> My exit strategy was to make hugetlbfs an alias for ramfs when ramfs
>> acquired the necessary functionality until expand-on-mmap() was merged.
>> That would've allowed rm -rf fs/hugetlbfs/ outright. A compatibility
>> wrapper for expand-on-mmap() around ramfs once ramfs acquires the
>> necessary functionality is now the exit strategy.

On Wed, Mar 21, 2007 at 05:53:48PM -0500, Matt Mackall wrote:
> Can you describe what ramfs needs here in a bit more detail?
> If it's non-trivial, I'd rather see any new functionality go into
> shmfs/tmpfs, as ramfs has done a good job at staying a minimal fs thus
> far.

I was referring to fully-general multiple pagesize support. ramfs
would inherit the functionality by virtue of generic pagecache and TLB
handling in such an arrangement. It doesn't make sense to modify ramfs
as a special case; hugetlb is as it stands a ramfs special-cased for
such purposes.


-- wli
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