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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45978C433F5 for ; Mon, 30 May 2022 10:14:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B5BA86B0071; Mon, 30 May 2022 06:14:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B0B376B0072; Mon, 30 May 2022 06:14:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9F7E26B0073; Mon, 30 May 2022 06:14:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 8E1316B0071 for ; Mon, 30 May 2022 06:14:25 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 5BA3A346F8 for ; Mon, 30 May 2022 10:14:25 +0000 (UTC) X-FDA: 79521999690.01.C21D6A1 Received: from out30-57.freemail.mail.aliyun.com (out30-57.freemail.mail.aliyun.com [115.124.30.57]) by imf23.hostedemail.com (Postfix) with ESMTP id 3612514005C for ; Mon, 30 May 2022 10:13:59 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R891e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0VEnJoDi_1653905659; Received: from 30.47.200.245(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0VEnJoDi_1653905659) by smtp.aliyun-inc.com(127.0.0.1); Mon, 30 May 2022 18:14:20 +0800 Message-ID: Date: Mon, 30 May 2022 18:14:45 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [RFC PATCH 2/3] hugetlb: do not update address in huge_pmd_unshare To: Mike Kravetz , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Muchun Song , Michal Hocko , Peter Xu , Naoya Horiguchi , James Houghton , Mina Almasry , "Aneesh Kumar K . V" , Anshuman Khandual , Paul Walmsley , Christian Borntraeger , Andrew Morton References: <20220527225849.284839-1-mike.kravetz@oracle.com> <20220527225849.284839-3-mike.kravetz@oracle.com> From: Baolin Wang In-Reply-To: <20220527225849.284839-3-mike.kravetz@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3612514005C X-Stat-Signature: zt7qcrhpck8ppeptymnoou6tptfbmsxg Authentication-Results: imf23.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf23.hostedemail.com: domain of baolin.wang@linux.alibaba.com designates 115.124.30.57 as permitted sender) smtp.mailfrom=baolin.wang@linux.alibaba.com X-HE-Tag: 1653905639-721470 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: On 5/28/2022 6:58 AM, Mike Kravetz wrote: > As an optimization for loops sequentially processing hugetlb address > ranges, huge_pmd_unshare would update a passed address if it unshared a > pmd. Updating a loop control variable outside the loop like this is > generally a bad idea. These loops are now using hugetlb_mask_last_hp > to optimize scanning when non-present ptes are discovered. The same > can be done when huge_pmd_unshare returns 1 indicating a pmd was > unshared. > > Remove address update from huge_pmd_unshare. Change the passed argument > type and update all callers. In loops sequentially processing addresses > use hugetlb_mask_last_hp to update address if pmd is unshared. > > Signed-off-by: Mike Kravetz LGTM. Please feel free to add: Reviewed-by: Baolin Wang