From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id 78C8E6B01F3 for ; Thu, 22 Apr 2010 11:14:43 -0400 (EDT) Date: Thu, 22 Apr 2010 10:14:04 -0500 (CDT) From: Christoph Lameter Subject: Re: [PATCH 04/14] mm,migration: Allow the migration of PageSwapCache pages In-Reply-To: <1271946226.2100.211.camel@barrios-desktop> Message-ID: References: <1271797276-31358-1-git-send-email-mel@csn.ul.ie> <20100421150037.GJ30306@csn.ul.ie> <20100421151417.GK30306@csn.ul.ie> <20100421153421.GM30306@csn.ul.ie> <20100422092819.GR30306@csn.ul.ie> <20100422184621.0aaaeb5f.kamezawa.hiroyu@jp.fujitsu.com> <20100422193106.9ffad4ec.kamezawa.hiroyu@jp.fujitsu.com> <20100422195153.d91c1c9e.kamezawa.hiroyu@jp.fujitsu.com> <1271946226.2100.211.camel@barrios-desktop> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Minchan Kim Cc: KAMEZAWA Hiroyuki , Mel Gorman , Andrew Morton , Andrea Arcangeli , Adam Litke , Avi Kivity , David Rientjes , KOSAKI Motohiro , Rik van Riel , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org