linux-kernel - Re: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.

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Message-ID: <20070321045214.GE2986@holomorphy.com>
Date:	Tue, 20 Mar 2007 21:52:14 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	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: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.

Adam Litke wrote:
>>  	struct vm_operations_struct * vm_ops;
>> +	const struct pagetable_operations_struct * pagetable_ops;

On Wed, Mar 21, 2007 at 03:18:30PM +1100, Nick Piggin wrote:
> Can you remind me why this isn't in vm_ops?
> Also, it is going to be hugepage-only, isn't it? So should the naming be
> changed to reflect that? And #ifdef it...

ISTR potential ppc64 users coming out of the woodwork for something I
didn't recognize the name of, but I may be confusing that with your
patch. I can implement additional users (and useful ones at that)
needing this in particular if desired.


Adam Litke wrote:
>> +struct pagetable_operations_struct {
>> +	int (*fault)(struct mm_struct *mm,

On Wed, Mar 21, 2007 at 03:18:30PM +1100, Nick Piggin wrote:
> I got dibs on fault ;)
> My callback is a sanitised one that basically abstracts the details of the
> virtual memory mapping away, so it is usable by drivers and filesystems.
> You actually want to bypass the normal fault handling because it doesn't
> know how to deal with your virtual memory mapping. Hmm, the best suggestion
> I can come up with is handle_mm_fault... unless you can think of a better
> name for me to use.

Two fault handling methods callbacks raise an eyebrow over here at least.
I was vaguely hoping for unification of the fault handling callbacks.


-- wli
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