From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-f200.google.com (mail-lb0-f200.google.com [209.85.217.200]) by kanga.kvack.org (Postfix) with ESMTP id C843D6B0005 for ; Thu, 12 May 2016 09:30:37 -0400 (EDT) Received: by mail-lb0-f200.google.com with SMTP id f14so12700745lbb.2 for ; Thu, 12 May 2016 06:30:37 -0700 (PDT) Received: from 18.mo6.mail-out.ovh.net (18.mo6.mail-out.ovh.net. [46.105.73.110]) by mx.google.com with ESMTPS id 15si45647520wme.80.2016.05.12.06.30.36 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 May 2016 06:30:36 -0700 (PDT) Received: from player795.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo6.mail-out.ovh.net (Postfix) with ESMTP id 16A5D1018D60 for ; Thu, 12 May 2016 15:30:35 +0200 (CEST) Subject: Re: [Question] Missing data after DMA read transfer - mm issue with transparent huge page? 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> <20160511145141.GA5288@gmail.com> <432180fd-2faf-af37-7d99-4e24ab263d50@morey-chaisemartin.com> <20160512093632.GA15092@gmail.com> From: Nicolas Morey-Chaisemartin Message-ID: Date: Thu, 12 May 2016 15:30:24 +0200 MIME-Version: 1.0 In-Reply-To: <20160512093632.GA15092@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Jerome Glisse 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 Le 05/12/2016 a 11:36 AM, Jerome Glisse a ecrit : > On Thu, May 12, 2016 at 08:07:59AM +0200, Nicolas Morey-Chaisemartin wrote: >> >> Le 05/11/2016 a 04:51 PM, Jerome Glisse a ecrit : >>> On Wed, May 11, 2016 at 01:15:54PM +0200, Nicolas Morey Chaisemartin wrote: >>>> Le 05/10/2016 a 12:01 PM, Jerome Glisse a ecrit : >>>>> On Tue, May 10, 2016 at 09:04:36AM +0200, Nicolas Morey Chaisemartin wrote: >>>>>> Le 05/03/2016 a 12:11 PM, Jerome Glisse a ecrit : >>>>>>> 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, >>>>> Jerome >>>> 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, >>> Jerome >> With transparent_hugepage=never I can't see the bug anymore. >> > Can you test https://patchwork.kernel.org/patch/9061351/ with 4.5 > (does not apply to 3.10) and without transparent_hugepage=never > > Jerome Fails with 4.5 + this patch and with 4.5 + this patch + yours Nicolas -- 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