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: <x49obcfnd6c.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 13 May 2013 10:54:03 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Mel Gorman <mgorman@...e.de>, Tang Chen <tangchen@...fujitsu.com>,
	Minchan Kim <minchan@...nel.org>,
	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, 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: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()

Benjamin LaHaise <bcrl@...ck.org> writes:

> On Mon, May 13, 2013 at 10:19:02AM +0100, Mel Gorman wrote:
>> On Mon, May 13, 2013 at 05:11:43PM +0800, Tang Chen wrote:
> ...
>> > If so, I'm wondering where should we put this callback pointers ?
>> > In struct page ?
>> > 
>> 
>> No, I would expect the callbacks to be part the address space operations
>> which can be found via page->mapping.
>
> If someone adds those callbacks and provides a means for testing them, 
> it would be pretty trivial to change the aio code to migrate its pinned 
> pages on demand.

How do you propose to move the ring pages?

Cheers,
Jeff
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