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

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Date:	Tue, 2 Jul 2013 14:00:08 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	Tang Chen <tangchen@...fujitsu.com>, Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan@...nel.org>, 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,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [WiP]: aio support for migrating pages (Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable())

On Mon, Jul 01, 2013 at 03:23:39PM +0800, Gu Zheng wrote:
> Hi Ben,
> Are you still working on this patch?
> As you know, using the current anon inode will lead to more than one instance of
> aio can not work. Have you found a way to fix this issue? Or can we use some
> other ones to replace the anon inode?

This patch hasn't been a high priority for me.  I would really appreciate 
it if someone could confirm that this patch does indeed fix the hotplug 
page migration issue by testing it in a system that hits the bug.  Removing 
the anon_inode bits isn't too much work, but I'd just like to have some 
confirmation that this fix is considered to be "good enough" for the 
problem at hand before spending any further time on it.  There was talk of 
using another approach, but it's not clear if there was any progress.

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