Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754647AbcKJIcL (ORCPT ); Thu, 10 Nov 2016 03:32:11 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41797 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752287AbcKJIcJ (ORCPT ); Thu, 10 Nov 2016 03:32:09 -0500 From: Anshuman Khandual Subject: Re: [PATCH v2 03/12] mm: thp: introduce separate TTU flag for thp freezing To: Naoya Horiguchi , linux-mm@kvack.org References: <1478561517-4317-1-git-send-email-n-horiguchi@ah.jp.nec.com> <1478561517-4317-4-git-send-email-n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" , Hugh Dickins , Andrew Morton , Dave Hansen , Andrea Arcangeli , Mel Gorman , Michal Hocko , Vlastimil Babka , Pavel Emelyanov , Zi Yan , Balbir Singh , linux-kernel@vger.kernel.org, Naoya Horiguchi Date: Thu, 10 Nov 2016 14:01:56 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <1478561517-4317-4-git-send-email-n-horiguchi@ah.jp.nec.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16111008-0016-0000-0000-000001EEF9AB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16111008-0017-0000-0000-000005D39190 Message-Id: <5824307C.7070105@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-10_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1611100159 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 380 Lines: 7 On 11/08/2016 05:01 AM, Naoya Horiguchi wrote: > TTU_MIGRATION is used to convert pte into migration entry until thp split > completes. This behavior conflicts with thp migration added later patches, Hmm, could you please explain why it conflicts with the PMD based migration without split ? Why TTU_MIGRATION cannot be used to freeze/hold on the PMD while it's being migrated ?