Received: by 2002:a05:6a10:1d13:0:0:0:0 with SMTP id pp19csp1969121pxb; Mon, 23 Aug 2021 08:51:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxX5mKE4/3wuXgwXvIKe8M9uALStXedR38qTkhQ7NWjunXJzj8R53LttKoWd7z3wG/D4Bs1 X-Received: by 2002:a05:6e02:108:: with SMTP id t8mr16288500ilm.216.1629733890673; Mon, 23 Aug 2021 08:51:30 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1629733890; cv=pass; d=google.com; s=arc-20160816; b=a2VfGCb8hzYIVzupsZk4S46U/UIiI7gi5bKiL7+iEwqS8UE2Nw9rmgR9L45/buRq8t lXmRuZ2ez4TDtnpwxJpZG4dYIuaUlRTRtEhl2PamXRDRTCFDw4302Gft/+vr4xJ2db15 JnNKoEdkZ+dRoB7sjic76BxqmO4FjSO4aJu986/+K2VeshnNIL34oWZ/ahYhaHPOnyU5 1d1etlGaq1cPW97rv/pHHi3+OYkA42g+nTeDjw9I3yJscfyda5tflVemh7MgxRuLyz4H 0CKFwKrX91L29YsUnEka5QMij8okPCYRKcCwh0gbhOlopY4FAw+iVszjiptTm1OKohPU gxhA== 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 :content-id:content-language:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature; bh=UEWwcS8/bSjO8PUd3JffRbN9GK3JzClvym6tthdFZhE=; b=fnMotw/ANEoM/UN6CYGRkuaoJpVt8eJUNNTFqw8wdKdqOYVrtk8m3YFUCs/VZQ+hkz lQfpD/mJZYH9vB8MAztbCYXMpAkhy+o7w5Kv15FK4P/Dp/JeSBYMDPUFr5NY/MVCo/Ny O+M+5bTr/64GhKOJbSg/9RSv5ZE1zT8nC9T8D0Q2a4O5ip4PxY8+bsJ5Ah03cORj90F1 MR6PL7TTjDvUf+P2GIMJKYMCCTL1oRm67u1YkpDAM4tJMUnSXZSPooA8TdKY9X6EYtaz xcrUFA9DKyZvyo1yIud0FDHB8zqc5daHbsVYxinsWDgVeP7ilVnxiBlM0HGxHjkBirqR 0EoQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@vmware.com header.s=selector2 header.b=pJbEvuC6; arc=pass (i=1 spf=pass spfdomain=vmware.com dkim=pass dkdomain=vmware.com dmarc=pass fromdomain=vmware.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=vmware.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id p133si12621853jap.27.2021.08.23.08.51.19; Mon, 23 Aug 2021 08:51:30 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@vmware.com header.s=selector2 header.b=pJbEvuC6; arc=pass (i=1 spf=pass spfdomain=vmware.com dkim=pass dkdomain=vmware.com dmarc=pass fromdomain=vmware.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=vmware.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231673AbhHWPvI (ORCPT + 99 others); Mon, 23 Aug 2021 11:51:08 -0400 Received: from mail-dm6nam12on2064.outbound.protection.outlook.com ([40.107.243.64]:14641 "EHLO NAM12-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231246AbhHWPvH (ORCPT ); Mon, 23 Aug 2021 11:51:07 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=LoboYsxUKN/B1+qbu0zuBbKSHZO/xHXCYYfJXt2kAGfjgfmzf3Ji4khFp+mquC/hW/VzmeENYlwZyQLTntsEMx+QZLDzt77rztQWrJLym4BWN01Pt4Jgv8LtWCmiLp/3vFS8jf+z8BWPSpJcaCGHsGLBQdSlxCEuJpExizH++bxL2r6JvzrgZHOVDxYu8ONI3XtwIiN5AyoUCCq7NeKvtEIb1SGnoSCW5TMY9DCOfYRMHd+wEdKEvNi3NRLXXI5SfcJGLIoaTNaFdiWe13InzsevPItF3JX588GDireoroy0n1mNV0M4xM4+buGxSnpLGBmzEcp/GMYeah2NCbQbCg== 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=UEWwcS8/bSjO8PUd3JffRbN9GK3JzClvym6tthdFZhE=; b=IGFXeKwnNUuRCojeXL6TX6Novsvj+HKTGg9/inOnG1/eUIRdVprxtCrKRz0kgPAHNaxunSh7idv/spm+ZhLvY9x55J21O/NyyzTWIOzBM+B80cUk+WQRDO9kYGuM5OeaVAEr2ptSAIQLmsJya1pxz+MRnTMIePRS1CCs3y8nktkrfqnIqjejsf9nUTzggeqJM5hrgr5/9qxLPxuMsqe3DLX/osRS+88NgWcXk6Y5MQQkX1opqKZ4Jup5kD556gyBkG42+jKDTRaH1uWSzsaCTifEWK+YDJG5qfXJ++PvltjduOXCDs73qSfA+UfMBGysmnGQGeb7iQywCMUYm5BULA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=vmware.com; dmarc=pass action=none header.from=vmware.com; dkim=pass header.d=vmware.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vmware.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=UEWwcS8/bSjO8PUd3JffRbN9GK3JzClvym6tthdFZhE=; b=pJbEvuC6VR/X+XMsevI7IFRu6ulp1HcZlJUio0PnTJ91Fv14rV1qg9NcDhdnZqlwWVVRzx4ATcYVrhW2io3tad4esS8SRqfh80Y8dn2DqHCjANL6yFvZQHQgPcmuo8LXiVKIYO/sdXORONWIcIW0Y5SDs6a6O98oOTG1L0epaxQ= Received: from BY3PR05MB8531.namprd05.prod.outlook.com (2603:10b6:a03:3ce::6) by BYAPR05MB5941.namprd05.prod.outlook.com (2603:10b6:a03:ce::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.9; Mon, 23 Aug 2021 15:50:23 +0000 Received: from BY3PR05MB8531.namprd05.prod.outlook.com ([fe80::481a:71e6:ac78:eb05]) by BY3PR05MB8531.namprd05.prod.outlook.com ([fe80::481a:71e6:ac78:eb05%9]) with mapi id 15.20.4457.017; Mon, 23 Aug 2021 15:50:23 +0000 From: Nadav Amit To: "Huang, Ying" CC: Linux-MM , Linux Kernel Mailing List , Mel Gorman , Andrea Arcangeli , Andrew Morton , Andy Lutomirski , Dave Hansen , Peter Zijlstra , Thomas Gleixner , Will Deacon , Yu Zhao , "x86@kernel.org" Subject: Re: [RFC 20/20] mm/rmap: avoid potential races Thread-Topic: [RFC 20/20] mm/rmap: avoid potential races Thread-Index: AQHXl/Wp2CF81BqPgUSvmHuUE1EgiquBPT0A Date: Mon, 23 Aug 2021 15:50:22 +0000 Message-ID: <3F1EF02A-6FD4-42BE-BD07-1C5AC97A515B@vmware.com> References: <20210131001132.3368247-1-namit@vmware.com> <20210131001132.3368247-21-namit@vmware.com> <87zgt8y4aj.fsf@yhuang6-desk2.ccr.corp.intel.com> In-Reply-To: <87zgt8y4aj.fsf@yhuang6-desk2.ccr.corp.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3654.120.0.1.13) authentication-results: intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=vmware.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b82fcb51-c16f-4533-4a54-08d9664db7b7 x-ms-traffictypediagnostic: BYAPR05MB5941: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:3383; 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:BY3PR05MB8531.namprd05.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(346002)(396003)(376002)(136003)(39860400002)(8676002)(2616005)(26005)(36756003)(4326008)(86362001)(6506007)(53546011)(54906003)(6916009)(33656002)(7416002)(76116006)(6512007)(6486002)(5660300002)(478600001)(8936002)(2906002)(64756008)(38070700005)(122000001)(38100700002)(316002)(66946007)(66446008)(66556008)(83380400001)(66476007)(71200400001)(186003)(45980500001);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?dENtQkkxVG85Z1RweUJ1dXAzM3RGUHpQdzl4clVuMzdLbUFPMndvMTkxVlY1?= =?utf-8?B?M1IzRmsrQ1E2VnE0WFNnRjQwUFhyNEtXdVl1b1FESGZNRGpzSTNjN0V2K0pJ?= =?utf-8?B?MmJmWTJLbGFPb2ptVlR1WEpYZFhsbFNRc3RXWlZGNVVmVkVDNVcxMW5HcnRm?= =?utf-8?B?b1JMU21LTUlndmlqbnMvdFg2L2kvcVB1T2JZaVBhcFc1MldDVW9NdE4rYmhG?= =?utf-8?B?aktzUnRzOG5hakc5cE05L2ZUNU83MEIvZmMxUkJ3aERsYVI5S1NkUHFMN05q?= =?utf-8?B?bW9iNStkZHIvMDZWelBCd2xTa3lhTkRzN0FSUk8xdUhmMGtrTWlHWkhKTDdj?= =?utf-8?B?dThvR1RCS1pjSWZrTFdCMGkwemxmK1FBRmFkcEc1MjkxQUcyZkhmT1h1MzdK?= =?utf-8?B?bXZlUko5TGpEU2xHK1hCNGNlbmVVM3AreWJZWkc1R29rY1RLRUNmSURGYXJt?= =?utf-8?B?bDg0S0RhbXl2dnhDSDY2TlNkaUluV1RVR0tkQnZVb1dwZ0F0aDdNa1RMVTd3?= =?utf-8?B?K1BtbzJDTXRaekVPUWpnMk15cmtjcE1YTU1ycXIvRytpOTZBWlZ0QmJSaStY?= =?utf-8?B?VG05YTBZUHlhUmZHbThqNkVFU08xQ3RKYkR3bU1wc29xZ1daM1IvT1JHNW5G?= =?utf-8?B?cDhKbjBNcjdITkxoT0UybEtBaTRLWHFKUFM3d2hxMnJ0KzFJTkVsK1QvdDBo?= =?utf-8?B?aFBaT3hLSWFmdnE3V1ppSEw1eTZucHN4L2RSd3pxOTArZ0tWYU9kYzVmM05x?= =?utf-8?B?d1ZkWWo1TzVDazVYbEFuSDBqUkprbnRFWDlQRUlRT3I5YzdEOVN0ZE9XVWQ5?= =?utf-8?B?YVNYci95WEFqMWVjdmpGMnpyWmlyTzRYK3RzMHJvdmtVOXYwR1VxRVFrcWdv?= =?utf-8?B?MmM2TWwyNHdjYlhKaFpnMVVDdXJ4VE9NOXFhNVlTTUUzWjBEMkpxTHdCblJl?= =?utf-8?B?MWR2WG45U3d6U0dwdnkraDlEYlNqTWRvSlc5RDU0QjVGSXp3cHZOd2VpSXdS?= =?utf-8?B?dERvbzhNWVU2TGJ5MWtzb0xYRFRTQlUwUEk5L1dIN0JuVXlpeCtnWVFCNEw1?= =?utf-8?B?TEVXOHd5RTZCOUt5c0pqWFhzbEp5czZRT0o0OEEvNHJ3Z21SQ0ZYMnBqNGJM?= =?utf-8?B?NWZ2MEoxbnhoakpKWUFwM0hjakhiL05MdnoyRVE5Z0ptMnR1ejVrb3owcUd1?= =?utf-8?B?Qlk2amlLb0liY0NYNWozZVRJRmFnbGNzNXBFMnlrbGVZRlo5dk5ueGc4UGFm?= =?utf-8?B?amhoVVorOGZ0U1J2SXJ4cXVJdzJGbE1mQlpYRGZydnhVMDFhVkl6Z2YxZzZQ?= =?utf-8?B?UHNkVTY4TzBVYms4YWYwZGpKZ2tqMjhaWGJQVVVSOHBEYTcrQWwxc3pWdjVP?= =?utf-8?B?YjFFVW9ER3F3eE1VZHpsVkRTZlJSYU0yY0tQU1VDcXRiNUQ3Wjd2RUZTUThm?= =?utf-8?B?SFAyRVNzNFRXKzQ5UitvZjMwZXdLWjhkOG5mdTlHbXRYNXNUMjlFRDhiNWVZ?= =?utf-8?B?dUNMSWtPd3pLRkZ3S21iWnR2T2Y4TFkrRjhPQVpPaElxc2FsWHYza3ZRVTFF?= =?utf-8?B?ZkY4NG4zWXBadHA4OUlSaWlZZFJJRmhMWUhTWi9peVFWZ0k2Qmo1SzRJRTJq?= =?utf-8?B?ekE1K2hCdCthcXAvMjRCR3lnSlpiWlZkV0trbC9UYlgzOGl0MnRJSDZWZFZq?= =?utf-8?B?UmEyRHUwbHJPdzNBdlN4dHBRL2Mwa0VJMDBIV01laVpuNTcydlVob2k5S2Y0?= =?utf-8?Q?io/nqU65vj+hj1v3p1dSXeHTq4+llv36WwQ2Sz3?= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="utf-8" Content-ID: <6D28EAAFBE37854288112E51348E8A23@namprd05.prod.outlook.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: vmware.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR05MB8531.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b82fcb51-c16f-4533-4a54-08d9664db7b7 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Aug 2021 15:50:22.9009 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: YIRSO++jvJbAjoGV7mUjOazRGcbh5aJJwIVytqluceEmlghVBsNKSF4c6scLFZwRLMukM/14zTA46iuPW6RWdQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB5941 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCj4gT24gQXVnIDIzLCAyMDIxLCBhdCAxOjA1IEFNLCBIdWFuZywgWWluZyA8eWluZy5odWFu Z0BpbnRlbC5jb20+IHdyb3RlOg0KPiANCj4gSGksIE5hZGF2LA0KPiANCj4gTmFkYXYgQW1pdCA8 bmFkYXYuYW1pdEBnbWFpbC5jb20+IHdyaXRlczoNCj4gDQo+PiBGcm9tOiBOYWRhdiBBbWl0IDxu YW1pdEB2bXdhcmUuY29tPg0KPj4gDQo+PiBmbHVzaF90bGJfYmF0Y2hlZF9wZW5kaW5nKCkgYXBw ZWFycyB0byBoYXZlIGEgdGhlb3JldGljYWwgcmFjZToNCj4+IHRsYl9mbHVzaF9iYXRjaGVkIGlz IGJlaW5nIGNsZWFyZWQgYWZ0ZXIgdGhlIFRMQiBmbHVzaCwgYW5kIGlmIGluDQo+PiBiZXR3ZWVu IGFub3RoZXIgY29yZSBjYWxscyBzZXRfdGxiX3ViY19mbHVzaF9wZW5kaW5nKCkgYW5kIHNldHMg dGhlDQo+PiBwZW5kaW5nIFRMQiBmbHVzaCBpbmRpY2F0aW9uLCB0aGlzIGluZGljYXRpb24gbWln aHQgYmUgbG9zdC4gSG9sZGluZyB0aGUNCj4+IHBhZ2UtdGFibGUgbG9jayB3aGVuIFNQTElUX0xP Q0sgaXMgc2V0IGNhbm5vdCBlbGltaW5hdGUgdGhpcyByYWNlLg0KPiANCj4gUmVjZW50bHksIHdo ZW4gSSByZWFkIHRoZSBjb3JyZXNwb25kaW5nIGNvZGUsIEkgZmluZCB0aGUgZXhhY3Qgc2FtZSBy YWNlDQo+IHRvby4gIERvIHlvdSBzdGlsbCB0aGluayB0aGUgcmFjZSBpcyBwb3NzaWJsZSBhdCBs ZWFzdCBpbiB0aGVvcnk/ICBJZg0KPiBzbywgd2h5IGhhc24ndCB5b3VyIGZpeCBiZWVuIG1lcmdl ZD8NCg0KSSB0aGluayB0aGUgcmFjZSBpcyBwb3NzaWJsZS4gSXQgZGlkbuKAmXQgZ2V0IG1lcmdl ZCwgSUlSQywgZHVlIHRvIHNvbWUNCmFkZHJlc3NhYmxlIGNyaXRpY2lzbSBhbmQgbGFjayBvZiBl bnRodXNpYXNtIGZyb20gb3RoZXIgcGVvcGxlLCBhbmQNCm15IGxhemluZXNzL2J1c3ktbmVzcy4N Cg0KPiANCj4+IFRoZSBjdXJyZW50IGJhdGNoZWQgVExCIGludmFsaWRhdGlvbiBzY2hlbWUgdGhl cmVmb3JlIGRvZXMgbm90IHNlZW0NCj4+IHZpYWJsZSBvciBlYXNpbHkgcmVwYWlyYWJsZS4NCj4g DQo+IEkgaGF2ZSBzb21lIGlkZWEgdG8gZml4IHRoaXMgd2l0aG91dCB0b28gbXVjaCBjb2RlLiAg SWYgbmVjZXNzYXJ5LCBJDQo+IHdpbGwgc2VuZCBpdCBvdXQuDQoNCkFyZ3VhYmx5LCBpdCB3b3Vs ZCBiZSBwcmVmZXJhYmxlIHRvIGhhdmUgYSBzbWFsbCBiYWNrLXBvcnRhYmxlIGZpeCBmb3INCnRo aXMgaXNzdWUgc3BlY2lmaWNhbGx5LiBKdXN0IHRyeSB0byBlbnN1cmUgdGhhdCB5b3UgZG8gbm90 IGludHJvZHVjZQ0KcGVyZm9ybWFuY2Ugb3ZlcmhlYWRzLiBBbnkgc29sdXRpb24gc2hvdWxkIGJl IGNsZWFyIGFib3V0IGl0cyBpbXBhY3QNCm9uIGFkZGl0aW9uYWwgVExCIGZsdXNoZXMgb24gdGhl IHdvcnN0LWNhc2Ugc2NlbmFyaW8gYW5kIHRoZSBudW1iZXINCm9mIGFkZGl0aW9uYWwgYXRvbWlj IG9wZXJhdGlvbnMgdGhhdCB3b3VsZCBiZSByZXF1aXJlZC4NCg0K