linux-kernel - Re: [PATCH 17/19, v2] mm/migrate: Introduce migrate_misplaced

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Message-ID: <50AA582E.30602@redhat.com>
Date:	Mon, 19 Nov 2012 11:02:54 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 17/19, v2] mm/migrate: Introduce migrate_misplaced_page()

On 11/18/2012 09:25 PM, Ingo Molnar wrote:
>
> * Ingo Molnar <mingo@...nel.org> wrote:
>
>> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>>
>> Add migrate_misplaced_page() which deals with migrating pages from
>> faults.
>>
>> This includes adding a new MIGRATE_FAULT migration mode to
>> deal with the extra page reference required due to having to look up
>> the page.
> [...]
>
>> --- a/include/linux/migrate_mode.h
>> +++ b/include/linux/migrate_mode.h
>> @@ -6,11 +6,14 @@
>>    *	on most operations but not ->writepage as the potential stall time
>>    *	is too significant
>>    * MIGRATE_SYNC will block when migrating pages
>> + * MIGRATE_FAULT called from the fault path to migrate-on-fault for mempolicy
>> + *	this path has an extra reference count
>>    */
>
> Note, this is still the older, open-coded version.
>
> The newer replacement version created from Mel's patch which
> reuses migrate_pages() and is nicer on out-of-node-memory
> conditions and is cleaner all around can be found below.
>
> I tested it today and it appears to work fine. I noticed no
> performance improvement or performance drop from it - if it
> holds up in testing it will be part of the -v17 release of
> numa/core.

Excellent. That gets rid of the last issue with numa/base :)


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