linux-kernel - Re: [PATCH] x86: fix PAE pmd

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Date:	Wed, 14 May 2008 14:01:41 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Hans Rosenfeld <hans.rosenfeld@....com>,
	Hugh Dickins <hugh@...itas.com>,
	Nishanth Aravamudan <nacc@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Gabriel C <nix.or.die@...glemail.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] x86: fix PAE pmd_bad bootup warning


On Thu, 2008-05-08 at 16:15 -0700, Dave Hansen wrote:
> Here's one quick stab at a solution.  I figured that we already pass
> that 'private' variable around.  This patch just sticks that variable
> *in* the mm_walk and also makes the caller fill in an 'mm' as well.
> Then, we just pass the actual mm_walk around.
> 
> Maybe we should just stick the VMA in the mm_walk as well, and have the
> common code keep it up to date with the addresses currently being
> walked.
> 
> Sadly, I didn't quite get enough time to flesh this idea out very far
> today, and I'll be offline for a couple of days now.  But, if someone
> wants to go this route, I thought this might be useful.  

This much looks reasonable. But the real test of course is to actually
teach it about detecting huge pages efficiently. And I suspect that
means tracking the current VMA all the time in the walk. Am I wrong?

-- 
Mathematics is the supreme nostalgia of our time.

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