linux-kernel - Re: [PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd

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Message-ID: <20121101104945.GQ3888@suse.de>
Date:	Thu, 1 Nov 2012 10:49:45 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd_pgprot()
 for s390

On Thu, Oct 25, 2012 at 02:16:24PM +0200, Peter Zijlstra wrote:
> From: Gerald Schaefer <gerald.schaefer@...ibm.com>
> 
> This patch adds an implementation of pmd_pgprot() for s390,
> in preparation to future THP changes.
> 

The additional pmd_pgprot implementations only are necessary if we want
to preserve the PROT_NONE protections across a split but that somewhat
forces that PROT_NONE be used as the protection bit across all
architectures. Is that possible? I think I would prefer that
prot-protection-across-splits just went away until it was proven
necessary and potentially recoded in terms of _PAGE_NUMA and friends
instead.

-- 
Mel Gorman
SUSE Labs
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