linux-kernel - Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non

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Message-ID: <20130206005217.GJ20842@kvack.org>
Date:	Tue, 5 Feb 2013 19:52:17 -0500
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Mel Gorman <mgorman@...e.de>, Lin Feng <linfeng@...fujitsu.com>,
	akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
	khlebnikov@...nvz.org, walken@...gle.com,
	kamezawa.hiroyu@...fujitsu.com, riel@...hat.com,
	rientjes@...gle.com, isimatu.yasuaki@...fujitsu.com,
	wency@...fujitsu.com, laijs@...fujitsu.com, jiang.liu@...wei.com,
	zab@...hat.com, jmoyer@...hat.com, linux-mm@...ck.org,
	linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()

On Wed, Feb 06, 2013 at 09:42:34AM +0900, Minchan Kim wrote:
> THP degradation by increasing MIGRATE_UNMOVABLE?
> Lin said most of GUP pages release the page in short so is it really problem?
> Even in embedded, we don't use THP yet but CMA and GUP call would be not too often
> but failing of CMA would be critical.
> 
> I'd like to hear opinions.

If aio was given a callback to migrate the pages on, it could just migrate 
the pages as needed.  There's nothing fundamental preventing that approach.

		-ben
-- 
"Thought is the essence of where you are now."
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