linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Date:	Tue, 29 May 2007 15:10:18 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	carsteno@...ibm.com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	richard.griffiths@...driver.com,
	Richard Griffiths <res07ml0@...izon.net>,
	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

Carsten Otte wrote:

> The current xip stack relies on having struct page behind the memory 
> segment. This causes few impact on memory management, but occupies some 
> more memory. The cramfs patch chose to modify copy on write in order to 
> deal with vmas that don't have struct page behind.
> So far, Hugh and Linus have shown strong opposition against copy on 
> write with no struct page behind. If this implementation is acceptable 
> to the them, it seems preferable to me over wasting memory. The xip 
> stack should be modified to use this vma flag in that case.

I would rather not :P

We can copy on write without a struct page behind the source today, no?
What is insufficient for the XIP code with the current COW?

-- 
SUSE Labs, Novell Inc.
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