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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 7DDDBC433FF for ; Wed, 31 Jul 2019 18:33:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 54C9B214DA for ; Wed, 31 Jul 2019 18:33:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="Rcc1vkKI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730256AbfGaSdk (ORCPT ); Wed, 31 Jul 2019 14:33:40 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:57580 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726876AbfGaSdj (ORCPT ); Wed, 31 Jul 2019 14:33:39 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6VIXFOF009959 for ; Wed, 31 Jul 2019 11:33:39 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=facebook; bh=bRpkMB+IavxhRux4OXH4DLu7NlF/d2cpuzrzUbrtFGI=; b=Rcc1vkKI62WNwXRCQyABJMLu8U90g3ObOaBIJFUyfU+JoKhJYh8LFAsowvQyvDWbpc+C BbnI81+p52tmz8vU/k5ad4M/wplt+GZtZcgCSFLe6YD9+bdnxk/CHXDrPgoAwy6DQFNu tIT0AG8NJnl1lfVg3/raftTXv1YgZWQyqyY= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 2u3dcu0sg8-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 31 Jul 2019 11:33:39 -0700 Received: from mx-out.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 31 Jul 2019 11:33:37 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 129EE62E1BBA; Wed, 31 Jul 2019 11:33:36 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: , , CC: , , , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v2 0/2] khugepaged: collapse pmd for pte-mapped THP Date: Wed, 31 Jul 2019 11:33:29 -0700 Message-ID: <20190731183331.2565608-1-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-31_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=576 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907310187 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Changes v1 => v2: 1. Call collapse_pte_mapped_thp() directly from uprobe_write_opcode(); 2. Add VM_BUG_ON() for addr alignment in khugepaged_add_pte_mapped_thp() and collapse_pte_mapped_thp(). This set is the newer version of 5/6 and 6/6 of [1]. Newer version of 1-4 of the work [2] was recently picked by Andrew. Patch 1 enables khugepaged to handle pte-mapped THP. These THPs are left in such state when khugepaged failed to get exclusive lock of mmap_sem. Patch 2 leverages work in 1 for uprobe on THP. After [2], uprobe only splits the PMD. When the uprobe is disabled, we get pte-mapped THP. After this set, these pte-mapped THP will be collapsed as pmd-mapped. [1] https://lkml.org/lkml/2019/6/23/23 [2] https://www.spinics.net/lists/linux-mm/msg185889.html Song Liu (2): khugepaged: enable collapse pmd for pte-mapped THP uprobe: collapse THP pmd after removing all uprobes include/linux/khugepaged.h | 12 ++++ kernel/events/uprobes.c | 9 +++ mm/khugepaged.c | 138 +++++++++++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+) -- 2.17.1