From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752658AbcEKOvy (ORCPT ); Wed, 11 May 2016 10:51:54 -0400 Received: from mail-qg0-f65.google.com ([209.85.192.65]:34066 "EHLO mail-qg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752162AbcEKOvx (ORCPT ); Wed, 11 May 2016 10:51:53 -0400 Date: Wed, 11 May 2016 16:51:41 +0200 From: Jerome Glisse To: Nicolas Morey Chaisemartin Cc: Hugh Dickins , Mel Gorman , Andrea Arcangeli , "Kirill A. Shutemov" , "Kirill A. Shutemov" , Alex Williamson , One Thousand Gnomes , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [Question] Missing data after DMA read transfer - mm issue with transparent huge page? Message-ID: <20160511145141.GA5288@gmail.com> References: <15edf085-c21b-aa1c-9f1f-057d17b8a1a3@morey-chaisemartin.com> <20160503101153.GA7241@gmail.com> <07619be9-e812-5459-26dd-ceb8c6490520@morey-chaisemartin.com> <20160510100104.GA18820@gmail.com> <60fc4f9f-fc8e-84a4-da84-a3c823b9b5bb@morey-chaisemartin.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <60fc4f9f-fc8e-84a4-da84-a3c823b9b5bb@morey-chaisemartin.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 11, 2016 at 01:15:54PM +0200, Nicolas Morey Chaisemartin wrote: > > > Le 05/10/2016 à 12:01 PM, Jerome Glisse a écrit : > > On Tue, May 10, 2016 at 09:04:36AM +0200, Nicolas Morey Chaisemartin wrote: > >> Le 05/03/2016 à 12:11 PM, Jerome Glisse a écrit : > >>> On Mon, May 02, 2016 at 09:04:02PM -0700, Hugh Dickins wrote: > >>>> On Fri, 29 Apr 2016, Nicolas Morey Chaisemartin wrote: > [...] > >> Hi, > >> > >> I backported the patch to 3.10 (had to copy paste pmd_protnone defitinition from 4.5) and it's working ! > >> I'll open a ticket in Redhat tracker to try and get this fixed in RHEL7. > >> > >> I have a dumb question though: how can we end up in numa/misplaced memory code on a single socket system? > >> > > This patch is not a fix, do you see bug message in kernel log ? Because if > > you do that it means we have a bigger issue. > > > > You did not answer one of my previous question, do you set get_user_pages > > with write = 1 as a paremeter ? > > > > Also it would be a lot easier if you were testing with lastest 4.6 or 4.5 > > not RHEL kernel as they are far appart and what might looks like same issue > > on both might be totaly different bugs. > > > > If you only really care about RHEL kernel then open a bug with Red Hat and > > you can add me in bug-cc > > > > Cheers, > > Jérôme > > I finally managed to get a proper setup. > I build a vanilla 4.5 kernel from git tree using the Centos7 config, my test fails as usual. > I applied your patch, rebuild => still fails and no new messages in dmesg. > > Now that I don't have to go through the RPM repackaging, I can try out things much quicker if you have any ideas. > Still an issue if you boot with transparent_hugepage=never ? Also to simplify investigation force write to 1 all the time no matter what. Cheers, Jérôme