linux-kernel - Re: [RFC] memory hotremove patch take 2 [10/10] (retry swap-in page)

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Message-Id: <20070509122605.e178e516.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 9 May 2007 12:26:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, akpm@...l.org,
	clameter@....com, mel@....ul.ie
Subject: Re: [RFC] memory hotremove patch take 2 [10/10] (retry swap-in
 page)

On Wed, 09 May 2007 12:12:32 +0900
Yasunori Goto <y-goto@...fujitsu.com> wrote:

> There is a race condition between swap-in and unmap_and_move().
> When swap-in occur, page_mapped might be not set yet.
> So, unmap_and_move() gives up at once, and tries later.
> 
> 
Note: this will not happen in sys_migratepage(), it holds mm->sem and
gathers migration target page from page table.

-Kame

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