From patchwork Tue Jul 25 18:31:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sidhartha Kumar X-Patchwork-Id: 125791 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9010:0:b0:3e4:2afc:c1 with SMTP id l16csp2700920vqg; Tue, 25 Jul 2023 13:01:34 -0700 (PDT) X-Google-Smtp-Source: APBJJlFnhfOO0E4wlhcKJcrkCY5xX9g/KYGpULBWtLm5BbnPaZScfRvjoRezsTgNDYdhhOkeZJSW X-Received: by 2002:a05:6a21:6d89:b0:131:f3a:4020 with SMTP id wl9-20020a056a216d8900b001310f3a4020mr41537pzb.33.1690315294093; Tue, 25 Jul 2023 13:01:34 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1690315294; cv=pass; d=google.com; s=arc-20160816; b=kr2P5n+aDVBoSDOLfZ1I/qjihoXtj51qD9YiNF1pNGG7lg8sallXJQyz6quVs7kaBg MTZWTo1KYm8kLl9Xc05/n7kEXiRpLGgLyxvJU97knWXg5bk9iH21E5m4Mgp2tuNXHrqR Vr0vrtxsuWddbxdMXBHjWxLIDA4vsCisoSp7FKTfJgp1zwzpAfqd7+ExHsIRNwu65C2b 0WQcYEkqrHX/jiPBeydRVK7wIBW8JP9gnqTyRiZuqK/3+DQdgpzAvSUibTgrQldgrIys EW75o6NqcRjekJwQ+exl0AjUFwQE7VaqEYp8gfIoRoQKwl1zbQhqMvz+yYOPDIeItonH YCQA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :message-id:date:subject:cc:to:from:dkim-signature:dkim-signature; bh=kaImxyG8aN7MdurwLcOttvFHNydHLkSSrAbreEB2QT8=; fh=67IPzruRP/ihMhkPZp9yZzjIXE0cbnxtkgSACwQ05tY=; b=rBH5eFYRe7X3MwUw8HUXZ9kc1oYfIH/2x/jCCuhZrmwk84IjG+yRlL/D+ZtmzwuEtc RF9Os0t4ijqFccwEUIjLIhP+Tyr4MAKh92Shg0zrA7upk5visof6x4gH7G0bB1ECzFVi iM05AQTCo5O1mxboCYp3mV6nLVGCaS096kdOTuAfmKE0Yp6NJ8Dx+T1vEOwONrl1gJja RrsdyajYwgwxwyLQ+W/+qo8Qs/ODuZzbwxYlEF/PeW08dc1NktMPCIz3FIwSndWbg5nH XaeteXKpX+91v6epe94mT+sB8lyM8WujGsyEkWDHhXxsZJPVj+sFzGXINWth6J0JqOen 6Y6A== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2023-03-30 header.b=p+Wg51Jj; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=TZ94phYE; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id a62-20020a639041000000b0055b28f930a3si12550599pge.546.2023.07.25.13.01.20; Tue, 25 Jul 2023 13:01:34 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2023-03-30 header.b=p+Wg51Jj; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=TZ94phYE; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231758AbjGYSdB (ORCPT + 99 others); Tue, 25 Jul 2023 14:33:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229603AbjGYScv (ORCPT ); Tue, 25 Jul 2023 14:32:51 -0400 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99C57E7E; Tue, 25 Jul 2023 11:32:41 -0700 (PDT) Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 36PFsLJJ021583; Tue, 25 Jul 2023 18:31:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : content-transfer-encoding : content-type : mime-version; s=corp-2023-03-30; bh=kaImxyG8aN7MdurwLcOttvFHNydHLkSSrAbreEB2QT8=; b=p+Wg51JjLahaaZ9jK6l5d1QecazQhSfsbHcEG6pzb59EZcck5Phiic1OK1w4hfbd7Moy N2IdRkzpIb+x3KNw0/cr9CiB2ZuQ79bQ3La4pqG6+G0tKrl/RC3USLV2D47aswICSlFE CdmnyQpSrTiBzulVQnuZsy/uWlkQ223YzCLQ2NfNuDuCsFGU0h7VVLtGXUV/2IVZKKGP fhdVHAoxY3XVwEWotk7iT2YNG00lp/EzgPrhQfXvaRFIzjDCXVqBvYZZeKVfV7aCI0ln Ap9MMjg2R+jrPmR2yHEKklco2l8pQttAcF99X8+pijU+mwoaQUZ/KHQeleSmkApGZQGm HA== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3s061c5tya-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 Jul 2023 18:31:50 +0000 Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 36PHqWMm033462; Tue, 25 Jul 2023 18:31:49 GMT Received: from nam02-dm3-obe.outbound.protection.outlook.com (mail-dm3nam02lp2041.outbound.protection.outlook.com [104.47.56.41]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3s05jbeq9x-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 Jul 2023 18:31:48 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=VkU8K3rQcQfues2h5k3mwgr7rjazqSSMrQlgL6moYQk0IlGApCSUE2+E7ywM4M+Uvi+HNBpyBu3X3X6FY7zfbjo9tb5NOhIWk/b0O6NJOppJaIlgI27xANGkfcr2GmpsGLtLJ966y5uoQWmvMNVMccaW+5uKKnUOEZ0vaJ7ITI2kFAJ+B6etdy/AXxr2RdB/3U9nx3+NW+L+i8cj014tZp4dJVOmcoqcKMNdKR+y0QHxNjKylX0Qxd3B07HAoZUk0Ccbh3JMTcf0OJxFyMJjvTbU2vDySLASibx1pL/wVZacHgWcRUvA4Al+S81woqq9ThxYWJWgzhCjSH047GAneg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=kaImxyG8aN7MdurwLcOttvFHNydHLkSSrAbreEB2QT8=; b=XC33zfFYoq7/Vqh1R/9jqKtJN6yrDOi6ioLqKom3HgDzmUIigVHP8B8C7oYEOXLD2bnI+a9L1Sc15naVSJ677fHaPexqjYumFt4kcQsqIW2Y2b2YweIGJoxtRBfR1lin13YG+UWmFk4VY0bd+MEnh40fysnHyrVa7VZiymBoE74Y4tzzmUisCqv1S1D5HSXj8BRTS1Q1wg+IdUBrgKeHLtZpUVuSpMxe0zDiygIEz+HQw70owT7nLRqwj2/LMjG2QZmPgn8V14xtVqwglm0gG0li/JOf2FglE7MmRCiB7TZkzQimR3KNvliHrcOIQ2dj80hJp3WsyS5/SqWR7RNSNw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=kaImxyG8aN7MdurwLcOttvFHNydHLkSSrAbreEB2QT8=; b=TZ94phYE8v50YZdpQyMzbSokKOOqIQfNbOwfCG9yD/zGt25ictlAY+VYCphUH0CBwi+cpDUOz44+kBhfZbk04ORvANf5iQDcF9P8Og3qkQlqc0wPQM0gISiWYUd1e/bix0mbqqqvb8iqvhqnjQhL0ZcH2c+pkW3Cc614pBOiyE4= Received: from CH0PR10MB5113.namprd10.prod.outlook.com (2603:10b6:610:c9::8) by IA1PR10MB7418.namprd10.prod.outlook.com (2603:10b6:208:445::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6609.32; Tue, 25 Jul 2023 18:31:46 +0000 Received: from CH0PR10MB5113.namprd10.prod.outlook.com ([fe80::6bff:7715:4210:1e52]) by CH0PR10MB5113.namprd10.prod.outlook.com ([fe80::6bff:7715:4210:1e52%7]) with mapi id 15.20.6609.032; Tue, 25 Jul 2023 18:31:46 +0000 From: Sidhartha Kumar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: Mike Kravetz , kernel test robot , Sidhartha Kumar , stable@vger.kernel.org, Thomas Backlund , Ackerley Tng , Erdem Aktas , Greg Kroah-Hartman , Matthew Wilcox , Muchun Song , Vishal Annapurve , Andrew Morton Subject: [PATCH] Revert "page cache: fix page_cache_next/prev_miss off by one" Date: Tue, 25 Jul 2023 11:31:29 -0700 Message-ID: <20230725183129.222692-1-sidhartha.kumar@oracle.com> X-Mailer: git-send-email 2.41.0 X-ClientProxiedBy: SJ0PR13CA0023.namprd13.prod.outlook.com (2603:10b6:a03:2c0::28) To CH0PR10MB5113.namprd10.prod.outlook.com (2603:10b6:610:c9::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH0PR10MB5113:EE_|IA1PR10MB7418:EE_ X-MS-Office365-Filtering-Correlation-Id: d9ce16be-45c0-4d5b-ba30-08db8d3d66d1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH0PR10MB5113.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(39860400002)(376002)(396003)(366004)(136003)(346002)(451199021)(5660300002)(8936002)(8676002)(7416002)(44832011)(316002)(41300700001)(478600001)(54906003)(2906002)(966005)(6666004)(6486002)(186003)(6512007)(1076003)(6506007)(2616005)(4326008)(66476007)(66946007)(66556008)(38100700002)(83380400001)(36756003)(86362001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: d9ce16be-45c0-4d5b-ba30-08db8d3d66d1 X-MS-Exchange-CrossTenant-AuthSource: CH0PR10MB5113.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jul 2023 18:31:46.2205 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1CzFBHzzYLrRiP1EWVnjcCxFgqY68kwYUbHo7og1Q3WUEGIa7fQsERzxxvL5CrM2neEAfbYtI+KfpCb0+I8pogz9gOyttPGpncvYEwDkHT4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB7418 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-25_10,2023-07-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 phishscore=0 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2307250158 X-Proofpoint-ORIG-GUID: USRh1Kijn3wAYDCZP-UQa5Knq-ZjBiKw X-Proofpoint-GUID: USRh1Kijn3wAYDCZP-UQa5Knq-ZjBiKw X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772424049790732738 X-GMAIL-MSGID: 1772424049790732738 From: Mike Kravetz commit 16f8eb3eea9eb2a1568279d64ca4dc977e7aa538 upstream This reverts commit 9425c591e06a9ab27a145ba655fb50532cf0bcc9 The reverted commit fixed up routines primarily used by readahead code such that they could also be used by hugetlb. Unfortunately, this caused a performance regression as pointed out by the Closes: tag. The hugetlb code which uses page_cache_next_miss will be addressed in a subsequent patch. Link: https://lkml.kernel.org/r/20230621212403.174710-1-mike.kravetz@oracle.com Fixes: 9425c591e06a ("page cache: fix page_cache_next/prev_miss off by one") Signed-off-by: Mike Kravetz Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202306211346.1e9ff03e-oliver.sang@intel.com Reviewed-by: Sidhartha Kumar Cc: stable@vger.kernel.org Cc: Thomas Backlund Cc: Ackerley Tng Cc: Erdem Aktas Cc: Greg Kroah-Hartman Cc: Matthew Wilcox Cc: Muchun Song Cc: Vishal Annapurve Signed-off-by: Andrew Morton --- As pointed out in [1], this patch was missed in the 6.4 stable tree. Resending this patch with a Cc: stable. [1]: https://lore.kernel.org/all/20230621212403.174710-1-mike.kravetz@oracle.com/T/#m9e33a9ccb76e4db123279b371cff57d4e1a1ed3a mm/filemap.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 8abce63b259c9..a2006936a6ae2 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1760,9 +1760,7 @@ bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm, * * Return: The index of the gap if found, otherwise an index outside the * range specified (in which case 'return - index >= max_scan' will be true). - * In the rare case of index wrap-around, 0 will be returned. 0 will also - * be returned if index == 0 and there is a gap at the index. We can not - * wrap-around if passed index == 0. + * In the rare case of index wrap-around, 0 will be returned. */ pgoff_t page_cache_next_miss(struct address_space *mapping, pgoff_t index, unsigned long max_scan) @@ -1772,13 +1770,12 @@ pgoff_t page_cache_next_miss(struct address_space *mapping, while (max_scan--) { void *entry = xas_next(&xas); if (!entry || xa_is_value(entry)) - return xas.xa_index; - if (xas.xa_index == 0 && index != 0) - return xas.xa_index; + break; + if (xas.xa_index == 0) + break; } - /* No gaps in range and no wrap-around, return index beyond range */ - return xas.xa_index + 1; + return xas.xa_index; } EXPORT_SYMBOL(page_cache_next_miss); @@ -1799,9 +1796,7 @@ EXPORT_SYMBOL(page_cache_next_miss); * * Return: The index of the gap if found, otherwise an index outside the * range specified (in which case 'index - return >= max_scan' will be true). - * In the rare case of wrap-around, ULONG_MAX will be returned. ULONG_MAX - * will also be returned if index == ULONG_MAX and there is a gap at the - * index. We can not wrap-around if passed index == ULONG_MAX. + * In the rare case of wrap-around, ULONG_MAX will be returned. */ pgoff_t page_cache_prev_miss(struct address_space *mapping, pgoff_t index, unsigned long max_scan) @@ -1811,13 +1806,12 @@ pgoff_t page_cache_prev_miss(struct address_space *mapping, while (max_scan--) { void *entry = xas_prev(&xas); if (!entry || xa_is_value(entry)) - return xas.xa_index; - if (xas.xa_index == ULONG_MAX && index != ULONG_MAX) - return xas.xa_index; + break; + if (xas.xa_index == ULONG_MAX) + break; } - /* No gaps in range and no wrap-around, return index beyond range */ - return xas.xa_index - 1; + return xas.xa_index; } EXPORT_SYMBOL(page_cache_prev_miss);