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

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Date:	Thu, 22 Mar 2007 10:02:07 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Adam Litke <agl@...ibm.com>
CC:	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>,
	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:
> On Wed, 2007-03-21 at 15:18 +1100, Nick Piggin wrote:
> 
>>Adam Litke wrote:

>>>diff --git a/include/linux/mm.h b/include/linux/mm.h
>>>index 60e0e4a..7089323 100644
>>>--- a/include/linux/mm.h
>>>+++ b/include/linux/mm.h
>>>@@ -98,6 +98,7 @@ struct vm_area_struct {
>>> 
>>> 	/* Function pointers to deal with this struct. */
>>> 	struct vm_operations_struct * vm_ops;
>>>+	const struct pagetable_operations_struct * pagetable_ops;
>>> 
>>> 	/* Information about our backing store: */
>>> 	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
>>
>>Can you remind me why this isn't in vm_ops?
> 
> 
> We didn't want to bloat the size of the vm_ops struct for all of its
> users.

But vmas are surely far more numerous than vm_ops, aren't they?

-- 
SUSE Labs, Novell Inc.
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