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

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Date:	Wed, 21 Mar 2007 16:32:27 -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:
>> We didn't want to bloat the size of the vm_ops struct for all of its
>> users.

On Thu, Mar 22, 2007 at 10:02:07AM +1100, Nick Piggin wrote:
> But vmas are surely far more numerous than vm_ops, aren't they?

It should be clarified that the pointer to the operations structure
in once-per-mmap() vmas is a bigger overhead than once-per-driver
function pointers in the vm_ops structure.


-- wli
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