linux-kernel - Re: [PATCH 06/43] mm: numa: Make pte_numa() and pmd

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Date:	Fri, 16 Nov 2012 18:12:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/43] mm: numa: Make pte_numa() and pmd_numa() a generic
 implementation


* Mel Gorman <mgorman@...e.de> wrote:

> > Why not use something what we have in numa/core already:
> > 
> >   f05ea0948708 mm/mpol: Create special PROT_NONE infrastructure
> > 
> 
> Because it's hard-coded to PROT_NONE underneath which I've 
> complained about before. [...]

To which I replied that this is the current generic 
implementation, the moment some different architecture comes 
around we can accomodate it - on a strictly as-needed basis.

It is *better* and cleaner to not expose random arch hooks but 
let the core kernel modification be documented in the very patch 
that the architecture support patch makes use of it.

Thanks,

	Ingo
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