From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43F62ECDFB8 for ; Mon, 23 Jul 2018 16:12:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0829820854 for ; Mon, 23 Jul 2018 16:12:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0829820854 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388490AbeGWROD (ORCPT ); Mon, 23 Jul 2018 13:14:03 -0400 Received: from mga04.intel.com ([192.55.52.120]:31587 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387970AbeGWROD (ORCPT ); Mon, 23 Jul 2018 13:14:03 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 Jul 2018 09:12:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,393,1526367600"; d="scan'208";a="242587604" Received: from djiang5-desk3.ch.intel.com ([143.182.136.93]) by orsmga005.jf.intel.com with ESMTP; 23 Jul 2018 09:12:06 -0700 Subject: Re: [PATCH v6 06/13] mm, dev_pagemap: Do not clear ->mapping on final put To: =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= Cc: Dan Williams , linux-nvdimm@lists.01.org, Jan Kara , linux-kernel@vger.kernel.org, stable@vger.kernel.org, linux-mm@kvack.org, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , linux-fsdevel@vger.kernel.org, Andrew Morton , hch@lst.de References: <153154376846.34503.15480221419473501643.stgit@dwillia2-desk3.amr.corp.intel.com> <153154380137.34503.3754023882460956800.stgit@dwillia2-desk3.amr.corp.intel.com> From: Dave Jiang Openpgp: preference=signencrypt Autocrypt: addr=dave.jiang@intel.com; prefer-encrypt=mutual; keydata= xsPuBE6TbysRDACKOBHZT4ez/3/idMBVQP+cMIJAWfTTLqbHVYLdHMHh4h6IXWLqWgc9AYTx /ajdOrBVGSK9kMuvqRi0iRO1QLOMUAIc2n/44vh/3Fe54QYfgbndeXhHZi7YEwjiTCbpQ336 pS0rS2qQaA8GzFwu96OslLI05j9Ygaqy73qmuk3wxomIYiu9a97aN3oVv1RyTp6gJK1NWT3J On17P1yWUYPvY3KJtpVqnRLkLZeOIiOahgf9+qiYqPhKQI1Ycx4YhbqkNmDG1VqdMtEWREZO DpTti6oecydN37MW1Y+YSzWYDVLWfoLUr2tBveGCRLf/U2n+Tm2PlJR0IZq+BhtuIUVcRLQW vI+XenR8j3vHVNHs9UXW/FPB8Xb5fwY2bJniZ+B4G67nwelhMNWe7H9IcEaI7Eo32fZk+9fo x6GDAhdT0pEetwuhkmI0YYD7cQj1mEx1oEbzX2p/HRW9sHTSv0V2zKbkPvii3qgvCoDb1uLd 4661UoSG0CYaAx8TwBxUqjsBAO9FXDhLHZJadyHmWp64xQGnNgBathuqoSsIWgQWBpfhDACA OYftX52Wp4qc3ZT06NPzGTV35xr4DVftxxUHiwzB/bzARfK8tdoW4A44gN3P03DAu+UqLoqm UP/e8gSLEjoaebjMu8c2iuOhk1ayHkDPc2gugTgLLBWPkhvIEV4rUV9C7TsgAAvNNDAe8X00 Tu1m01A4ToLpYsNWEtM9ZRdKXSo6YS45DFRhel29ZRz24j4ZNIxN9Bee/fn7FrL4HgO01yH+ QULDAtU87AkVoBdU5xBJVj7tGosuV+ia4UCWXjTzb+ERek2503OvNq4xqche3RMoZLsSHiOj 5PjMNX4EA6pf5kRWdNutjmAsXrpZrnviWMPy+zHUzHIw/gaI00lHMjS0P99A7ay/9BjtsIBx lJZ09Kp6SE0EiZpFIxB5D0ji6rHu3Qblwq+WjM2+1pydVxqt2vt7+IZgEB4Qm6rml835UB89 TTkMtiIXJ+hMC/hajIuFSah+CDkfagcrt1qiaVoEAs/1cCuAER+h5ClMnLZPPxNxphsqkXxn 3MVJcMEL/iaMimP3oDXJoK3O+u3gC3p55A/LYZJ7hP9lHTT4MtgwmgBp9xPeVFWx3rwQOKix SPONHlkjfvn4dUHmaOmJyKgtt5htpox+XhBkuCZ5UWpQ40/GyVypWyBXtqNx/0IKByXy4QVm QjUL/U2DchYhW+2w8rghIhkuHX2YOdldyEvXkzN8ysGR31TDwshg600k4Q/UF/MouC2ZNeMa y8I0whHBFTwSjN5T1F9cvko4PsHNB3QH4M4tbArwn4RzSX6Hfxoq59ziyI4Et6sE5SyiVEZQ DhKZ8VU61uUaYHDdid8xKU4sV5IFCERIoIwieEAkITNvCdFtuXl9gugzld7IHbOTRaGy4M+M gOyAvSe5ysBrXhY+B0d+EYif1I8s4PbnkH2xehof++lQuy3+1TZcweSx1f/uF6d92ZDkvJzQ QbkicMLaPy0IS5XIMkkpD1zIO0jeaHcTm3uzB9k8N9y4tA2ELWVR/iFZigrtrwpIJtJLUieB 89EOJLR6xbksSrFhQ80oRGF2ZSBKaWFuZyAoV29yaykgPGRhdmUuamlhbmdAaW50ZWwuY29t PsJ9BBMRCAAlAhsjBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCUZEwDwIZAQAKCRBkFcTx ZqO5Ps8HAP4kF/KAor80fNwT7osSHGG5rLFPR/Yc5V0QpqkU8DhZDgEAoStRa/a6Mtq3Ri1H B84kFIqSQ9ME5049k6k1K7wdXcvOwE0ETpNvKxAEANGHLx0q/R99wzbVdnRthIZttNQ6M4R8 AAtEypE9JG3PLrEd9MUB5wf0fB/2Jypec3x935mRW3Zt1i+TrzjQDzMV5RyTtpWI7PwIh5IZ 0h4OV2yQHFVViHi6lubCRypQYiMzTmEKua3LeBGvUR9vVmpPJZ/UP6VajKqywjPHYBwLAAMF A/9B/PdGc1sZHno0ezuwZO2J9BOsvASNUzamO9to5P9VHTA6UqRvyfXJpNxLF1HjT4ax7Xn4 wGr6V1DCG3JYBmwIZjfinrLINKEK43L+sLbVVi8Mypc32HhNx/cPewROY2vPb4U7y3jhPBtt lt0ZMb75Lh7zY3TnGLOx1AEzmqwZSMJhBBgRCAAJBQJOk28rAhsMAAoJEGQVxPFmo7k+qiUB AKH0QWC+BBBn3pa9tzOz5hTrup+GIzf5TcuCsiAjISEqAPkBTGk5iiGrrHkxsz8VulDVpNxk o6nmKbYpUAltQObU2w== Message-ID: <3fcb3c8a-2a41-7c78-edde-066c10110d34@intel.com> Date: Mon, 23 Jul 2018 09:12:06 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <153154380137.34503.3754023882460956800.stgit@dwillia2-desk3.amr.corp.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jerome, Is it possible to get an ack for this? Thanks! On 07/13/2018 09:50 PM, Dan Williams wrote: > MEMORY_DEVICE_FS_DAX relies on typical page semantics whereby ->mapping > is only ever cleared by truncation, not final put. > > Without this fix dax pages may forget their mapping association at the > end of every page pin event. > > Move this atypical behavior that HMM wants into the HMM ->page_free() > callback. > > Cc: > Cc: Jan Kara > Cc: Jérôme Glisse > Cc: Andrew Morton > Cc: Ross Zwisler > Fixes: d2c997c0f145 ("fs, dax: use page->mapping...") > Signed-off-by: Dan Williams > --- > kernel/memremap.c | 1 - > mm/hmm.c | 2 ++ > 2 files changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/memremap.c b/kernel/memremap.c > index 5857267a4af5..62603634a1d2 100644 > --- a/kernel/memremap.c > +++ b/kernel/memremap.c > @@ -339,7 +339,6 @@ void __put_devmap_managed_page(struct page *page) > __ClearPageActive(page); > __ClearPageWaiters(page); > > - page->mapping = NULL; > mem_cgroup_uncharge(page); > > page->pgmap->page_free(page, page->pgmap->data); > diff --git a/mm/hmm.c b/mm/hmm.c > index de7b6bf77201..f9d1d89dec4d 100644 > --- a/mm/hmm.c > +++ b/mm/hmm.c > @@ -963,6 +963,8 @@ static void hmm_devmem_free(struct page *page, void *data) > { > struct hmm_devmem *devmem = data; > > + page->mapping = NULL; > + > devmem->ops->free(devmem, page); > } > > > _______________________________________________ > Linux-nvdimm mailing list > Linux-nvdimm@lists.01.org > https://lists.01.org/mailman/listinfo/linux-nvdimm >