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 CA968C4338F for ; Sat, 21 Aug 2021 09:43:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A532E611F0 for ; Sat, 21 Aug 2021 09:43:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234369AbhHUJnk (ORCPT ); Sat, 21 Aug 2021 05:43:40 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:14405 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233879AbhHUJnf (ORCPT ); Sat, 21 Aug 2021 05:43:35 -0400 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-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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; if (!PageHuge(page)) continue; -- 2.23.0