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=-8.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, 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 0EC4EC67872 for ; Fri, 14 Dec 2018 06:27:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D37C220645 for ; Fri, 14 Dec 2018 06:27:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D37C220645 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 S1727271AbeLNG1n (ORCPT ); Fri, 14 Dec 2018 01:27:43 -0500 Received: from mga07.intel.com ([134.134.136.100]:52223 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726437AbeLNG1m (ORCPT ); Fri, 14 Dec 2018 01:27:42 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Dec 2018 22:27:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,351,1539673200"; d="scan'208";a="125840795" Received: from yhuang-mobile.sh.intel.com ([10.239.197.226]) by fmsmga002.fm.intel.com with ESMTP; 13 Dec 2018 22:27:40 -0800 From: Huang Ying To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Huang Ying , Vineeth Remanan Pillai , Kelley Nielsen , Rik van Riel , Matthew Wilcox , Hugh Dickins Subject: [PATCH -V9 01/21] swap: Deal with PTE mapped THP when unuse PTE Date: Fri, 14 Dec 2018 14:27:34 +0800 Message-Id: <20181214062754.13723-2-ying.huang@intel.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20181214062754.13723-1-ying.huang@intel.com> References: <20181214062754.13723-1-ying.huang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A PTE swap entry may map to a normal swap slot inside a huge swap cluster. To free the huge swap cluster and the corresponding THP (transparent huge page), all PTE swap entry mappings need to be unmapped. The original implementation only checks current PTE swap entry mapping, this is fixed via calling try_to_free_swap() instead, which will check all PTE swap mappings inside the huge swap cluster. This fix could be folded into the patch: mm, swap: rid swapoff of quadratic complexity in -mm patchset. Signed-off-by: "Huang, Ying" Cc: Vineeth Remanan Pillai Cc: Kelley Nielsen Cc: Rik van Riel Cc: Matthew Wilcox Cc: Hugh Dickins --- mm/swapfile.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 7464d0a92869..9e6da494781f 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1921,10 +1921,8 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd, goto out; } - if (PageSwapCache(page) && (swap_count(*swap_map) == 0)) - delete_from_swap_cache(compound_head(page)); + try_to_free_swap(page); - SetPageDirty(page); unlock_page(page); put_page(page); -- 2.18.1