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: <20130513150147.GQ31899@kvack.org>
Date:	Mon, 13 May 2013 11:01:47 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Jeff Moyer <jmoyer@...hat.com>
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()

On Mon, May 13, 2013 at 10:54:03AM -0400, Jeff Moyer wrote:
> How do you propose to move the ring pages?

It's the same problem as doing a TLB shootdown: flush the old pages from 
userspace's mapping, copy any existing data to the new pages, then 
repopulate the page tables.  It will likely require the addition of 
address_space_operations for the mapping, but that's not too hard to do.

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