linux-kernel - Re: [PATCH 12/19] mm: migrate: Introduce migrate_misplaced

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Message-ID: <20121113093644.GA21522@gmail.com>
Date:	Tue, 13 Nov 2012 10:36:44 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	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 12/19] mm: migrate: Introduce migrate_misplaced_page()


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

> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> 
> Note: This was originally based on Peter's patch "mm/migrate: Introduce
> 	migrate_misplaced_page()" but borrows extremely heavily from Andrea's
> 	"autonuma: memory follows CPU algorithm and task/mm_autonuma stats
> 	collection". The end result is barely recognisable so signed-offs
> 	had to be dropped. If original authors are ok with it, I'll
> 	re-add the signed-off-bys.
> 
> Add migrate_misplaced_page() which deals with migrating pages from
> faults.
> 
> Based-on-work-by: Lee Schermerhorn <Lee.Schermerhorn@...com>
> Based-on-work-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Based-on-work-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> ---
>  include/linux/migrate.h |    8 ++++
>  mm/migrate.c            |  104 ++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 110 insertions(+), 2 deletions(-)

That's a nice patch - the TASK_NUMA_FAULT approach in the 
original patch was not very elegant.

I've started testing it to see how well your version works.

Thanks,

	Ingo
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