linux-kernel - Re: [PATCH] VMI: remove CONFIG_DEBUG_PAGE

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Date:	Fri, 06 Jul 2007 13:28:16 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	Chris Wright <chrisw@...s-sol.org>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization@...ts.osdl.org,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	"Robert P. J. Day" <rpjday@...dspring.com>
Subject: Re: [PATCH] VMI: remove CONFIG_DEBUG_PAGE_TYPE and associated	bitrotted
 code

Zachary Amsden wrote:
> I'd rather keep it, even with bitrot - it was non-trivial to get 
> correct, and found many surprises in the code; most notably, it can 
> detect
>
> 1) PTE writes to pages not declared as page tables
> 2) Failure to allocate or de-allocate page tables using the 
> paravirt-ops API
> 3) PTE writes using the wrong level operations
>
> These are most useful properties; in fact, I would like to extend the 
> code for 64-bit paravirt-ops and 4-level paging, so rather not kill it 
> until then.
>
> I never merged the whole bit upstream because it added a field to 
> struct page. 

Hm, is that a big problem?  It would be OK for a debug config option, 
wouldn't it?  Also, it doesn't seem particularly vmi-specific.  Could it 
be made part of the pvops infrastructure?

    J
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