From patchwork Thu Dec 10 17:03:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liam R. Howlett" X-Patchwork-Id: 11965711 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 E7F83C433FE for ; Thu, 10 Dec 2020 17:06:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 87AC122D6E for ; Thu, 10 Dec 2020 17:06:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 87AC122D6E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=Oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0B4846B0080; Thu, 10 Dec 2020 12:06:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 03D6F6B0082; Thu, 10 Dec 2020 12:06:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E20DF6B0087; Thu, 10 Dec 2020 12:06:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0194.hostedemail.com [216.40.44.194]) by kanga.kvack.org (Postfix) with ESMTP id CB4926B0080 for ; Thu, 10 Dec 2020 12:06:53 -0500 (EST) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 8DF5A181AEF3E for ; Thu, 10 Dec 2020 17:06:53 +0000 (UTC) X-FDA: 77578002306.02.brain28_081824e273fa Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 3B31210097AA1 for ; Thu, 10 Dec 2020 17:06:53 +0000 (UTC) X-HE-Tag: brain28_081824e273fa X-Filterd-Recvd-Size: 5342 Received: from aserp2120.oracle.com (aserp2120.oracle.com [141.146.126.78]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Thu, 10 Dec 2020 17:06:52 +0000 (UTC) Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0BAGnOGg044303; Thu, 10 Dec 2020 17:06:46 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=EHI9EXTDB7bNKY9p6xmQoh3Jw5G8x8vXTTyZtM9sATw=; b=XQzFup8ZYfWJrHhuM9msSFtjXWvn4U6AW0JvUD+V8WFoJVbVqulunITnDS4DLaSrS1vj JruTvOemFPHd7+wqCx7K8ik0mXwMefpeOKCluvLTQkxOIrd+I7+Wc61l2YQbKqRZatnq ZTGaNo/RIFCcJERrJ/Y/Ft7+THJxSk+OzKvVrBPSleXkEwYd57gQG2WQbcFtoZ+VDGPd SPB8jVMwt7yLvQCpLMmJqcoGnooWQc62ZKpL57CWgjvgjW1tQYPlb62tqTAS46VH+Pbr 0M55jhwMVOXFBHCZjmfVIY3NfeBp5Xavnjo5j1y7J/dSH0L0jW4+Hjo2gG+Q9g6KzpvY ug== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 35825mehfv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 10 Dec 2020 17:06:46 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0BAGw0cL033196; Thu, 10 Dec 2020 17:04:45 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 358m52gban-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 10 Dec 2020 17:04:45 +0000 Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0BAH4ivD012779; Thu, 10 Dec 2020 17:04:44 GMT Received: from revolver.jebus.ca (/23.233.25.87) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 10 Dec 2020 09:04:43 -0800 From: "Liam R. Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Jerome Glisse , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka Subject: [PATCH 09/28] mm/mmap: Change find_vma_prev() to use maple tree Date: Thu, 10 Dec 2020 12:03:43 -0500 Message-Id: <20201210170402.3468568-10-Liam.Howlett@Oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201210170402.3468568-1-Liam.Howlett@Oracle.com> References: <20201210170402.3468568-1-Liam.Howlett@Oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9830 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 spamscore=0 suspectscore=0 bulkscore=0 malwarescore=0 phishscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012100106 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9830 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 mlxscore=0 spamscore=0 lowpriorityscore=0 malwarescore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012100106 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: Change the implementation of find_vma_prev to use the new maple tree data structure. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 53876d66a27ea..3a9e04df021e3 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2510,23 +2510,30 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) } EXPORT_SYMBOL(find_vma); -/* - * Same as find_vma, but also return a pointer to the previous VMA in *pprev. +/** + * find_vma_prev() - Find the VMA for a given address, or the next vma and + * sets %pprev to the previous VMA, if any. + * @mm The mm_struct to check + * @addr: The address + * @pprev: The pointer to set to the previous VMA + * + * Returns: The VMA associated with @addr, or the next vma. + * May return NULL in the case of no vma at addr or above. */ struct vm_area_struct * find_vma_prev(struct mm_struct *mm, unsigned long addr, - struct vm_area_struct **pprev) + struct vm_area_struct **pprev) { struct vm_area_struct *vma; + MA_STATE(mas, &mm->mm_mt, addr, addr); - vma = find_vma(mm, addr); - if (vma) { - *pprev = vma->vm_prev; - } else { - struct rb_node *rb_node = rb_last(&mm->mm_rb); + rcu_read_lock(); + vma = mas_find(&mas, ULONG_MAX); + if (!vma) + mas_reset(&mas); - *pprev = rb_node ? rb_entry(rb_node, struct vm_area_struct, vm_rb) : NULL; - } + *pprev = mas_prev(&mas, 0); + rcu_read_unlock(); return vma; }