linux-kernel - Re: [PATCH 37/46] mm: numa: Add THP migration for the NUMA working set scanning fault case.

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Date:	Wed, 21 Nov 2012 11:24:33 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	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 37/46] mm: numa: Add THP migration for the NUMA working
 set scanning fault case.

On Wed, Nov 21, 2012 at 10:21:43AM +0000, Mel Gorman wrote:
> Note: This is very heavily based on a patch from Peter Zijlstra with
> 	fixes from Ingo Molnar, Hugh Dickins and Johannes Weiner.  That patch
> 	put a lot of migration logic into mm/huge_memory.c where it does
> 	not belong. This version puts tries to share some of the migration
> 	logic with migrate_misplaced_page.  However, it should be noted
> 	that now migrate.c is doing more with the pagetable manipulation
> 	than is preferred. The end result is barely recognisable so as
> 	before, the signed-offs had to be removed but will be re-added if
> 	the original authors are ok with it.
> 
> Add THP migration for the NUMA working set scanning fault case.
> 
> It uses the page lock to serialize. No migration pte dance is
> necessary because the pte is already unmapped when we decide
> to migrate.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> ---
>  include/linux/migrate.h |   16 ++++
>  mm/huge_memory.c        |   55 +++++++-----
>  mm/internal.h           |    2 +
>  mm/migrate.c            |  212 ++++++++++++++++++++++++++++++++++++++---------
>  4 files changed, 226 insertions(+), 59 deletions(-)
> 

And now that I've released it I see that this almost certainly broke
memcg as the memcontrol.c bits are missing. I'll need to carry them
over.

-- 
Mel Gorman
SUSE Labs
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