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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 2C10FC432BE for ; Sat, 21 Aug 2021 09:42:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D87FD61040 for ; Sat, 21 Aug 2021 09:42:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D87FD61040 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 4F2DD8D0001; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 47DAB6B0075; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2ABC68D0002; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0103.hostedemail.com [216.40.44.103]) by kanga.kvack.org (Postfix) with ESMTP id 0A0A16B0072 for ; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 8E19D1841B9F1 for ; Sat, 21 Aug 2021 09:42:57 +0000 (UTC) X-FDA: 78498598794.09.AC6DAB4 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by imf19.hostedemail.com (Postfix) with ESMTP id 22BFBB0000A5 for ; Sat, 21 Aug 2021 09:42:57 +0000 (UTC) Received: from dggeme703-chm.china.huawei.com (unknown [172.30.72.54]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4GsD3c0Pj9zdcDt; Sat, 21 Aug 2021 17:39:08 +0800 (CST) Received: from huawei.com (10.175.124.27) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Sat, 21 Aug 2021 17:42:54 +0800 From: Miaohe Lin To: CC: , , , , , , Subject: [PATCH 3/3] mm/memory_hotplug: make HWPoisoned dirty swapcache pages unmovable Date: Sat, 21 Aug 2021 17:42:46 +0800 Message-ID: <20210821094246.10149-4-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210821094246.10149-1-linmiaohe@huawei.com> References: <20210821094246.10149-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected Authentication-Results: imf19.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=huawei.com; spf=pass (imf19.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-Stat-Signature: bb51smeksbdjubj3hhwi9zy6kpmsdf4e X-Rspamd-Queue-Id: 22BFBB0000A5 X-Rspamd-Server: rspam04 X-HE-Tag: 1629538977-356156 Content-Transfer-Encoding: quoted-printable 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: HWPoisoned dirty swapcache pages are kept for killing owner processes. We should not offline these pages or do_swap_page() would access the offline pages and lead to bad ending. Signed-off-by: Miaohe Lin --- mm/memory_hotplug.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 9fd0be32a281..0488eed3327c 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1664,6 +1664,12 @@ static int scan_movable_pages(unsigned long start,= unsigned long end, */ if (PageOffline(page) && page_count(page)) return -EBUSY; + /* + * HWPoisoned dirty swapcache pages are definitely unmovable + * because they are kept for killing owner processes. + */ + if (PageHWPoison(page) && PageSwapCache(page)) + return -EBUSY; =20 if (!PageHuge(page)) continue; --=20 2.23.0