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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 D92A3C433DB for ; Tue, 9 Mar 2021 18:54:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 40CAF64F25 for ; Tue, 9 Mar 2021 18:54:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 40CAF64F25 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 C6FC18D0134; Tue, 9 Mar 2021 13:54:18 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C20F78D012A; Tue, 9 Mar 2021 13:54:18 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A23B78D0134; Tue, 9 Mar 2021 13:54:18 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0027.hostedemail.com [216.40.44.27]) by kanga.kvack.org (Postfix) with ESMTP id 83B4A8D012A for ; Tue, 9 Mar 2021 13:54:18 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 32A8F181AF5E1 for ; Tue, 9 Mar 2021 18:54:18 +0000 (UTC) X-FDA: 77901236196.13.9550C23 Received: from aserp2130.oracle.com (aserp2130.oracle.com [141.146.126.79]) by imf08.hostedemail.com (Postfix) with ESMTP id 52B0B801914D for ; Tue, 9 Mar 2021 18:54:11 +0000 (UTC) Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 129Injj7047489; Tue, 9 Mar 2021 18:54:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : in-reply-to : content-type : content-transfer-encoding : mime-version; s=corp-2020-01-29; bh=pdOJJEm9QcI0SAqTzxPjcQ51msYPic7WLA6N9//kJc4=; b=kC0P0D2NwCbcUwu2ZRhhZkfd1MtxjVJhTW4ZJZvC5MryuSMPpwBG0Rz6R7sVt8lHSBdz hJ52fHEAOb7sxrrN1UJ556WL/fHXgk7cUwV+O6+Qkj0ptTbIEdJDiqnHbkDntF6ZuPsw UWMltQhDh2roO7zpiYg8/JgYmJy8Ljd3pMRNJZzJ4mpqhPaiklvkXOqWejJT1BmLElWW J8ZQgpcr3LYfR47N4JInMUn1tVKjE/Kf0iMv8OGrH495aN5dPV2Lbx3O137uuZwaPIHO QtSAhf+YmTFaY7bn57wk9YjC2FX4auSPhCsl41GtsYqlpbslHaIcq4aM9edalg/5Vbxo 5g== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2130.oracle.com with ESMTP id 373y8brm5j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 09 Mar 2021 18:54:16 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 129Ip2LZ166250; Tue, 9 Mar 2021 18:54:15 GMT Received: from nam12-dm6-obe.outbound.protection.outlook.com (mail-dm6nam12lp2168.outbound.protection.outlook.com [104.47.59.168]) by userp3020.oracle.com with ESMTP id 374kgs7q1j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 09 Mar 2021 18:54:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=gGkkgMuTDYP5G1XeXfPQR3BRoy8QEyEt1QwOajjAqEptau94NNJE0NI35aBfffYJkN1VPsMKlIkc/OEWl5RKt6knFnIotBj7S5LsZUlBLRGWXKDhjmx9L+qj6836BiAjI3L1WEwEiFJIookE4Do7HvdkdmvNqfy5zQLlep977qLeJsJROW9HVXluoXR8C2t4ej0bBQKjGaUKVdDV1tbJFzT2l986cbfT+loHt4KjJYvAxvVQWAU6SHe8XaTVK4Cz1ztuRGo0W2adNkmNeQquEHdlO0suvNGCOXsuvPvfgX/7Ez4OGJDD9HUpQNsJQNIxJTuL/dIdNmf5HqjPTeJ6Yg== 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-SenderADCheck; bh=pdOJJEm9QcI0SAqTzxPjcQ51msYPic7WLA6N9//kJc4=; b=Zhx51PyuRpJWQtEFT7dPBU9Fh38DDVhxjXr0M28LaLguhuBH3FKRn/4/KeR/4ao+fEGFFdTU5jCL591yGKtNjfGY0bUIs23Pru4YycJlGk//UbbmhGSTWrnzsqH0BlAXj3s+I5ukK8LBmzo8RDhMztTCcQHszgzlfsBvpLJX8xcJmLxzU1gC/qQU3RmeabSFO/CeORsnQaJzff4SIQHSKdKS3v61Y3jPul1SPFBwX8AK4N+wNuXJJl95nHyDfRM5J4OjQGBY1rqNzzzfpuJUDLedlfntwz9gCJfH36TlFGQiQWm2qkG6gXlRW0lrojGg5tPmGxoLTAUhpdw9BkLVvQ== 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=pdOJJEm9QcI0SAqTzxPjcQ51msYPic7WLA6N9//kJc4=; b=oQtsqKxTE04MtLQG7JXrtebj7t7p0i8TnONp1qXSb7Js+crTtTkaAMjeQHtdRCzBB87F34m0Xn4F1KofxEQr/iJCmlfI0GRTSK6FN45D1ZxhhZa2XOnmSGYbt0nQsrb/kCMpKQFBpxokOj75BXaTeOxNkovEdwJHDzUIbPLnatk= Authentication-Results: kvack.org; dkim=none (message not signed) header.d=none;kvack.org; dmarc=none action=none header.from=oracle.com; Received: from BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) by BY5PR10MB4116.namprd10.prod.outlook.com (2603:10b6:a03:203::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3912.17; Tue, 9 Mar 2021 18:54:12 +0000 Received: from BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::980e:61ba:57d2:47ee]) by BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::980e:61ba:57d2:47ee%7]) with mapi id 15.20.3912.029; Tue, 9 Mar 2021 18:54:12 +0000 Subject: Re: Is MAP_POPULATE supposed to fail silently? To: Bruce Merry , David Hildenbrand Cc: Linux MM References: From: Mike Kravetz Message-ID: <39da494e-d6b4-66b9-f6e1-3a9a9513f02c@oracle.com> Date: Tue, 9 Mar 2021 10:54:09 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MW4PR03CA0342.namprd03.prod.outlook.com (2603:10b6:303:dc::17) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.2.112] (50.38.35.18) by MW4PR03CA0342.namprd03.prod.outlook.com (2603:10b6:303:dc::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3912.17 via Frontend Transport; Tue, 9 Mar 2021 18:54:11 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 465c2b49-c13f-48bb-ecb3-08d8e32cba6c X-MS-TrafficTypeDiagnostic: BY5PR10MB4116: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; X-MS-Exchange-SenderADCheck: 1 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:BY5PR10MB4196.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(396003)(366004)(136003)(346002)(39860400002)(376002)(16526019)(2906002)(36756003)(4744005)(6486002)(31686004)(4326008)(83380400001)(186003)(5660300002)(66946007)(86362001)(966005)(31696002)(16576012)(52116002)(316002)(110136005)(956004)(2616005)(66476007)(478600001)(66556008)(44832011)(8936002)(53546011)(26005)(8676002)(45980500001)(43740500002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?clozQUE5MzIxMzBpS2p3QjMzRDltQXN0KzlwaWpjT3hCZlN0eVJwSC8vM0V6?= =?utf-8?B?SjBnSTRVWHFoLzdOOHFHRkh3MVFCMmhGWlBmNFpKMDJNVWp6Nnl1UHZrc1Zq?= =?utf-8?B?MXZyYXphemxodWhjaHdMendTWUZldkJoL1pueWtGeFhTdVl3SmVrS3haUzNa?= =?utf-8?B?cTgxYWgyb2lhS1dMcVVxekpIbjZaVkFoZ2tBMHM0VWpPdGNlVFdaeGV3N2dY?= =?utf-8?B?NkJ4N1BRbWpzeFB0Q0V5ckFQK1ZhOU5XVkppV244UUpPYTVGTkl0L1ZadW1t?= =?utf-8?B?bnZvZGpOTHpQK0Vxb1UwVURDdHZvazJ2OTRrV0JUVkFtRnI5N0xqbDNKRlFL?= =?utf-8?B?eWdyNWpBSWo3TnpxZzJLclVDdWUzQW9ZY3o5RmxWUmlQQW9GK01qdFU4bk5V?= =?utf-8?B?L09vL2J0NzljTGtEUUFZREpuWllyNFFSNGhiZUNZUkw1c2JGUjY3U1BtN1FK?= =?utf-8?B?Vlc3TXhqWmhLbkJWMlNGZWJLUzVTUHc3UHEzVjlBeU9HMmthVVZhT2xJY3FH?= =?utf-8?B?d3hZQzlwZldOeGRzWmR1NFA5QjByNWlKbmZEM2JBa3BPS2F3WlhNa2hmNGdu?= =?utf-8?B?bGFITk50Z2RqZlNuSExINWpScGc3U0NPVlY4M3NOOUNzblNRYW5RejNCMzZL?= =?utf-8?B?WXo3bFhDR0hQaWJZNWdMSE95RXBUQ1Rrc1NUWTg0QTR4bHA4bmt2ZlB6aFRv?= =?utf-8?B?YTk5SndsYUlVSFJicWZNd25TKzU5OWh4QmxaRDlNek5xUDJYRzd6d1ArVXlp?= =?utf-8?B?WTRXR21pMXRjM09ieTZRNzVQdGxRTkdHTDlnVXplNzNmc2xaT3VNYkFTVEh6?= =?utf-8?B?MTZUVDdmNGhVenRnK3ZRZFU4QkprcVJBN2pYMnIvNk1NS1RjUkhiRnFTZnYz?= =?utf-8?B?b3dCRkkyU1dXSmFCN3lYK2N3NytFRnc1OVFsSlJQMmRtdzNYOXRITU04R3VQ?= =?utf-8?B?VGt1Uk9MYXpvTDE4ZnoxU28vN0llMGp1WWt4ckJMUDVlMVJZNkFhanZLZ2dV?= =?utf-8?B?Z2pTN3B5YkJvRFVONEozcjRrN3dCejVKMXBodzNHR0M1dUIwQ0ZHd2NYVzQx?= =?utf-8?B?SEREMGVHR1NMNWJ4V3hkclFYQUFFQjRIY3JHdWVheTd6SWl2UW5yOXk5ZzVl?= =?utf-8?B?bUtNUUhHZFNaK05JK2UydmxqQnFyTTlFbTNIVDUvbnJnaHNEV3VzZk5WUnBs?= =?utf-8?B?NGdPdXB3QXNPSElpa1lOM01qc1pnVzFHWnhZOHFreDJpdHdoaHVKNDh5dCtx?= =?utf-8?B?bUdSc3YrWmFha2JxZDA4aEExWXZoVmJJYWRuR0FrVHoyWUY0aFowUXZjNUFD?= =?utf-8?B?N2h1WG1RYm9keEN3RDFUcm1nT1c5RlE5VTVIK2g3NUtOOUd4bnljRlh1RTJE?= =?utf-8?B?Vmttbkc3dnhqRUlCcy9BU0t1cE45WG1ZbG50N0U2dTY5dmx6dXpON3Zpc2h0?= =?utf-8?B?RXVqR3J5L2F0UXJQVjVZQ2NMMlJPUDZOU3p6eTRuR2Y2aW4zMVAyL1A5MmNh?= =?utf-8?B?aUpWL0JFNkNKNGRIbisreEx5U3JNcUV6UjJYZnlUVXRHSDd6dlpNVlZXS2Vq?= =?utf-8?B?c1c5MUN6WGEwM3c0QU9UaUNZd3hXY2lENUhPczJ0aEJQcFp4aEtpVm9nZ0Zr?= =?utf-8?B?d1huMTZMTDVYbnhhRmVmOGE5d3NvenFzQTB6dDBIWlc3QUptTmFCNE5acUR5?= =?utf-8?B?dGpwQnJsT3RCK2pqRkJBUjVqRmh2d0l3M2Y0YUw5NFhpT0d6KzM1YUNxY0ZO?= =?utf-8?Q?EXIJbTnkjNnG0lQ8OyzDHLAx82+G84LEusq5i4e?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 465c2b49-c13f-48bb-ecb3-08d8e32cba6c X-MS-Exchange-CrossTenant-AuthSource: BY5PR10MB4196.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Mar 2021 18:54:12.2794 (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: RSY5MjNe2GVuLaQcHPtYD1bpF2wIgoGSSniWCijsVqsWkhgs+6iypFNGVK7DTpMFYpkph5YY+FiuqAyCf5R4AQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR10MB4116 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9918 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 adultscore=0 malwarescore=0 bulkscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103090089 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9918 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1011 mlxscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 adultscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103090089 X-Stat-Signature: f4im45dmidggreyz7hmwcb3bui74o81e X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 52B0B801914D Received-SPF: none (oracle.com>: No applicable sender policy available) receiver=imf08; identity=mailfrom; envelope-from=""; helo=aserp2130.oracle.com; client-ip=141.146.126.79 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615316051-461416 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 3/9/21 3:10 AM, Bruce Merry wrote: > Thanks. I'm hoping that the *.rsvd.limit_in_bytes cgroup settings will > suffice if we can upgrade the production systems to a kernel new enough to > have them, and mlock() is a possibility as well, but it's useful to know > about the other options. Mostly I wanted to know whether this was a kernel > problem or a documentation problem. I've filed > https://bugzilla.kernel.org/show_bug.cgi?id=212153 for the man page. Thanks Bruce. As David mentioned, MAP_POPULATE is not guaranteed to succeed. hugetlb reservation cgroup was created to handle situations like your use case. Hopefully, you can update systems and it will meet your needs. -- Mike Kravetz