linux-kernel - Re: [PATCH 04/14] mm,migration: Allow the migration of PageSwapCache pages

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Message-ID: <alpine.DEB.2.00.1004221009150.32107@router.home>
Date:	Thu, 22 Apr 2010 10:14:04 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Minchan Kim <minchan.kim@...il.com>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 04/14] mm,migration: Allow the migration of PageSwapCache
  pages

On Thu, 22 Apr 2010, Minchan Kim wrote:

> For further optimization, we can hold vma->adjust_lock if vma_address
> returns -EFAULT. But I hope we redesigns it without new locking.
> But I don't have good idea, now. :(

You could make it atomic through the use of RCU.

Create a new vma entry with the changed parameters and then atomically
switch to the new vma.

Problem is that you have some list_heads in there.

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