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

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Message-ID: <20121116144109.GA8218@suse.de>
Date:	Fri, 16 Nov 2012 14:41:09 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Rik van Riel <riel@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

On Fri, Nov 16, 2012 at 09:09:03AM -0500, Rik van Riel wrote:
> On 11/16/2012 06:22 AM, Mel Gorman wrote:
> >It was pointed out by Ingo Molnar that the per-architecture definition of
> >the NUMA PTE helper functions means that each supporting architecture
> >will have to cut and paste it which is unfortunate. He suggested instead
> >that the helpers should be weak functions that can be overridden by the
> >architecture.
> >
> >This patch moves the helpers to mm/pgtable-generic.c and makes them weak
> >functions. Architectures wishing to use this will still be required to
> >define _PAGE_NUMA and potentially update their p[te|md]_present and
> >pmd_bad helpers if they choose to make PAGE_NUMA similar to PROT_NONE.
> >
> >Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> Is uninlining these simple tests really the right thing to do,
> or would they be better off as inlines in asm-generic/pgtable.h ?
> 

I would have preferred asm-generic/pgtable.h myself and use
__HAVE_ARCH_whatever tricks to keep the inlining but Ingo's suggestion
was to use __weak (https://lkml.org/lkml/2012/11/13/134) and I did not
have a strong reason to disagree. Is there a compelling choice either
way or a preference?

-- 
Mel Gorman
SUSE Labs
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