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

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Message-ID: <20070321225348.GO10459@waste.org>
Date:	Wed, 21 Mar 2007 17:53:48 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	William Lee Irwin III <wli@...omorphy.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:
> On Wed, 21 Mar 2007 14:43:48 CDT, Adam Litke said:
> >> The main reason I am advocating a set of pagetable_operations is to
> >> enable the development of a new hugetlb interface.
> 
> On Wed, Mar 21, 2007 at 03:51:31PM -0400, Valdis.Kletnieks@...edu wrote:
> > Do you have an exit strategy for the *old* interface?
> 
> Hello.
> 
> 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.

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.

-- 
Mathematics is the supreme nostalgia of our time.
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