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=-3.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 A7A9BC433E0 for ; Wed, 8 Jul 2020 01:25:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83AC620708 for ; Wed, 8 Jul 2020 01:25:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729322AbgGHBZr (ORCPT ); Tue, 7 Jul 2020 21:25:47 -0400 Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]:43725 "EHLO out30-132.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729302AbgGHBZr (ORCPT ); Tue, 7 Jul 2020 21:25:47 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R331e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07488;MF=richard.weiyang@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0U243BE._1594171543; Received: from localhost(mailfrom:richard.weiyang@linux.alibaba.com fp:SMTPD_---0U243BE._1594171543) by smtp.aliyun-inc.com(127.0.0.1); Wed, 08 Jul 2020 09:25:43 +0800 From: Wei Yang To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, vbabka@suse.cz, yang.shi@linux.alibaba.com, thomas_os@shipmail.org, anshuman.khandual@arm.com, sean.j.christopherson@intel.com, richard.weiyang@linux.alibaba.com, peterx@redhat.com, aneesh.kumar@linux.ibm.com, willy@infradead.org, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, digetx@gmail.com Subject: [Patch v3 0/4] mm/mremap: cleanup move_page_tables() a little Date: Wed, 8 Jul 2020 09:24:49 +0800 Message-Id: <20200708012453.36588-1-richard.weiyang@linux.alibaba.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org move_page_tables() tries to move page table by PMD or PTE. The root reason is if it tries to move PMD, both old and new range should be PMD aligned. But current code calculate old range and new range separately. This leads to some redundant check and calculation. This cleanup tries to consolidate the range check in one place to reduce some extra range handling. v3: * merge patch 1 with 2 as suggested by Kirill * add patch 4 to simplify the logic to calculate next and extent v2: * remove 3rd patch which doesn't work on ARM platform. Thanks report and test from Dmitry Osipenko Wei Yang (4): mm/mremap: it is sure to have enough space when extent meets requirement mm/mremap: calculate extent in one place mm/mremap: start addresses are properly aligned mm/mremap: use pmd_addr_end to simplify the calculate of extent include/linux/huge_mm.h | 2 +- mm/huge_memory.c | 8 +------- mm/mremap.c | 27 ++++++++++----------------- 3 files changed, 12 insertions(+), 25 deletions(-) -- 2.20.1 (Apple Git-117)