From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oa0-f78.google.com (mail-oa0-f78.google.com [209.85.219.78]) by kanga.kvack.org (Postfix) with ESMTP id 264406B0031 for ; Fri, 20 Dec 2013 15:39:47 -0500 (EST) Received: by mail-oa0-f78.google.com with SMTP id m1so40337oag.5 for ; Fri, 20 Dec 2013 12:39:46 -0800 (PST) Received: from qmta11.emeryville.ca.mail.comcast.net (qmta11.emeryville.ca.mail.comcast.net. [2001:558:fe2d:44:76:96:27:211]) by mx.google.com with ESMTP id t7si3142052qar.107.2013.12.19.07.41.52 for ; Thu, 19 Dec 2013 07:41:54 -0800 (PST) Date: Thu, 19 Dec 2013 09:41:50 -0600 (CST) From: Christoph Lameter Subject: Re: bad page state in 3.13-rc4 In-Reply-To: Message-ID: References: <20131219040738.GA10316@redhat.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds Cc: Dave Jones , Mel Gorman , Linux Kernel , linux-mm On Wed, 18 Dec 2013, Linus Torvalds wrote: > Somebody who knows the migration code needs to look at this. ChristophL? Its been awhile sorry and there has been a huge amount of work done on top of my earlier work. Cannot debug that anymore and I am finding myself in the role of the old guy who just complains a lot. Some of that functionality seems bizarre to me like the on the fly conversion between huge pages and regular pages, weird and complex page count handling etc etc. The last time I looked at the code I was horrified to find that the new huge page migration does not use migration ptes to create a cooldown phase but directly swaps the pmd. That used to cause huge problems with regular pages in the past. But I was told that was all safe. Mel? -- 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