linux-kernel - Re: [PATCH 14/43] mm: mempolicy: Use _PAGE

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Message-ID: <50A66513.3010900@redhat.com>
Date:	Fri, 16 Nov 2012 11:08:51 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
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 14/43] mm: mempolicy: Use _PAGE_NUMA to migrate pages

On 11/16/2012 06:22 AM, Mel Gorman wrote:
> Note: Based on "mm/mpol: Use special PROT_NONE to migrate pages" but
> 	sufficiently different that the signed-off-bys were dropped
>
> Combine our previous _PAGE_NUMA, mpol_misplaced and migrate_misplaced_page()
> pieces into an effective migrate on fault scheme.
>
> Note that (on x86) we rely on PROT_NONE pages being !present and avoid
> the TLB flush from try_to_unmap(TTU_MIGRATION). This greatly improves the
> page-migration performance.
>
> Based-on-work-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Reviewed-by: Rik van Riel <riel@...hat.com>

(this is getting easier, I must have reviewed this code 4x now)

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