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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 447C0C0018C for ; Wed, 16 Dec 2020 13:28:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9BB9722D02 for ; Wed, 16 Dec 2020 13:28:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9BB9722D02 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id CDD446B0071; Wed, 16 Dec 2020 08:28:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C8BF86B0072; Wed, 16 Dec 2020 08:28:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B547E6B0073; Wed, 16 Dec 2020 08:28:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0054.hostedemail.com [216.40.44.54]) by kanga.kvack.org (Postfix) with ESMTP id 9EA8A6B0071 for ; Wed, 16 Dec 2020 08:28:54 -0500 (EST) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 51E2B1EE6 for ; Wed, 16 Dec 2020 13:28:54 +0000 (UTC) X-FDA: 77599225788.11.group58_63080502742c Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin11.hostedemail.com (Postfix) with ESMTP id 31CE6180F8B80 for ; Wed, 16 Dec 2020 13:28:54 +0000 (UTC) X-HE-Tag: group58_63080502742c X-Filterd-Recvd-Size: 2643 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf43.hostedemail.com (Postfix) with ESMTP for ; Wed, 16 Dec 2020 13:28:53 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 670ECAC7B; Wed, 16 Dec 2020 13:28:52 +0000 (UTC) Date: Wed, 16 Dec 2020 14:28:48 +0100 From: Oscar Salvador To: Muchun Song Cc: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v9 06/11] mm/hugetlb: Set the PageHWPoison to the raw error page Message-ID: <20201216132847.GB29394@linux> References: <20201213154534.54826-1-songmuchun@bytedance.com> <20201213154534.54826-7-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201213154534.54826-7-songmuchun@bytedance.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Dec 13, 2020 at 11:45:29PM +0800, Muchun Song wrote: > Because we reuse the first tail vmemmap page frame and remap it > with read-only, we cannot set the PageHWPosion on a tail page. > So we can use the head[4].private to record the real error page > index and set the raw error page PageHWPoison later. Maybe the following is better? "Since the first page of tail page structs is remapped read-only, we cannot modify any tail struct page, and so we cannot set the HWPoison flag on a tail page. We can make use of head[4].private to record the real hwpoisoned page index. Right before freeing the page the real raw page will be retrieved and marked as HWPoison. " I think it is slighly clearer, but whatever. > Signed-off-by: Muchun Song I do not quite like the name hwpoison_subpage_deliver, but I cannot come up with a better one myself, so: Reviewed-by: Oscar Salvador -- Oscar Salvador SUSE L3