From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 02C8BA04D8; Mon, 21 Sep 2020 19:16:52 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id CEB711DA73; Mon, 21 Sep 2020 19:16:50 +0200 (CEST) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id AEEE61DA6D for ; Mon, 21 Sep 2020 19:16:48 +0200 (CEST) IronPort-SDR: aHVCETaur4WgkC4igcLxm9ycQoAz3gjDigVICLFjc693HLfgF5vOj/FObfP40HSqsb1YltOMCF R0G71IhZuv6A== X-IronPort-AV: E=McAfee;i="6000,8403,9751"; a="160503846" X-IronPort-AV: E=Sophos;i="5.77,287,1596524400"; d="scan'208";a="160503846" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2020 10:16:40 -0700 IronPort-SDR: m8TMkLmbpjNaW48x8MqSEx0IKVKIFdV0qvPvIN6RQ2Vqr0ct8m1k+sfBCQ8AacYcNOEqt86uMs RF41t54+2kgw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,287,1596524400"; d="scan'208";a="304606747" Received: from orsmsx601.amr.corp.intel.com ([10.22.229.14]) by orsmga003.jf.intel.com with ESMTP; 21 Sep 2020 10:16:40 -0700 Received: from orsmsx607.amr.corp.intel.com (10.22.229.20) by ORSMSX601.amr.corp.intel.com (10.22.229.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Mon, 21 Sep 2020 10:16:40 -0700 Received: from orsmsx601.amr.corp.intel.com (10.22.229.14) by ORSMSX607.amr.corp.intel.com (10.22.229.20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Mon, 21 Sep 2020 10:16:39 -0700 Received: from ORSEDG602.ED.cps.intel.com (10.7.248.7) by orsmsx601.amr.corp.intel.com (10.22.229.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5 via Frontend Transport; Mon, 21 Sep 2020 10:16:39 -0700 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (104.47.55.101) by edgegateway.intel.com (134.134.137.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.1713.5; Mon, 21 Sep 2020 10:16:37 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=hMxqXBo+nzvB8aI7fpw2Oge1Zr5hc/zMWy8FPwG35F/OZ8yHk78Z05NUNcFAUeyR0KcXD0GQdNAJ+AVc4nMos2z+xsk3sMK0wpvZ+i99+xmX0RfrkaEEjGKvnjytJtIy1RKV34r7IXbMAyQl+4tzZGNOhReUAKN6OWxckuHCPfIZzVs9y0cDwLGSdy6AgO0RMjtucAvg+9RMMqRH2euq8xjESKFCJk9FqwupmKkoZkAsmYeeMjOE8DRVGM4SPrE5c4k5HFuypvYJkboce826Wqi2eRwyEGiRu4z4zioiZYS17He3S3hOPbw+tan5XP2s/hkzibnwbc7C8/1M8QCx4Q== 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=Y/IFho+PS17K65yTpFMgywwMzy3Zbsn5M3sWUonPG6Q=; b=idhDwSrKNJppwPPZEdneK57AonbWiqWR5q0uarbGbTcMs7wYcPREdkHapHjg0dIVuzW7xTVHccRpEkWFwGQ72cxDLPILF8u1ccqtNaqyc6euX6GK2nKDLz+GBrEpN/ouT4Eu559ZY2Lbxqfuc//SdIf2tz38CkFx1FhUS1EYpGLFgnVHjlBBT+zIZyJPqMsllLMHT8BaQ4SDIAJ+RpJXfkHwulOV8nJlSAXWfS0btUa1+qVguQeuvmpTsanUSi4UnTnZPxyUo9qfWvSG9YMqCSKazv5est+SuRUAZCpDKNV3xitmXAMRbbOZb4d9F2weh87AtL/ODsj5qp0eJTdgBA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Y/IFho+PS17K65yTpFMgywwMzy3Zbsn5M3sWUonPG6Q=; b=hTASutVghLuLTIVxu6rRRqhdZzKUNmQqKooPhvYvLT69dEFIZimhhCGtSKXfN5xZ9RiSH2PXmXWAI2CSeWKxBL65jMqy0MeeyAvog0kvGtvKzWBOkpCt1M6aP8DtxbQKX+QwOpxA01aimrV7pBjP9eqArJQscHZnj7JUp6h5trU= Received: from SN6PR11MB2574.namprd11.prod.outlook.com (2603:10b6:805:59::14) by SN6PR11MB3295.namprd11.prod.outlook.com (2603:10b6:805:c2::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3391.11; Mon, 21 Sep 2020 17:16:37 +0000 Received: from SN6PR11MB2574.namprd11.prod.outlook.com ([fe80::54:b143:c75e:41bd]) by SN6PR11MB2574.namprd11.prod.outlook.com ([fe80::54:b143:c75e:41bd%7]) with mapi id 15.20.3391.026; Mon, 21 Sep 2020 17:16:37 +0000 From: "Eads, Gage" To: Steven Lariau , Olivier Matz CC: "dev@dpdk.org" , "nd@arm.com" , "dharmik.thakkar@arm.com" Thread-Topic: [PATCH 2/5] lib/stack: remove push acquire fence Thread-Index: AQHWiFCiPJNBANn7/Ei6eAD0LLWAgqlzT/yw Date: Mon, 21 Sep 2020 17:16:36 +0000 Message-ID: References: <20200911152938.8019-1-steven.lariau@arm.com> <20200911152938.8019-3-steven.lariau@arm.com> In-Reply-To: <20200911152938.8019-3-steven.lariau@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [68.203.30.51] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 92867ce1-eee2-47b5-0081-08d85e5218f1 x-ms-traffictypediagnostic: SN6PR11MB3295: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4941; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: +XWtOYFwvy1YR8lylk3njWmfw3idi5uQv6jO7UEeDxq+b4zau2N02LMYTKDeWEs7KjiWmuO6Q7N4w2tWojAyLC+8N8mJ2Xin2LuKETJx+ozdXnxNF3Alm6l0MPQKKqhlDLFESNmMe9IeZvrKiMlD+4Xr3ObTh4y9G9iNvHucD4mraRGoHYpx3z+rF928KB5SW5UEgd4lCi1m5IFaAL9/D/lfKHCLudWmjvtFsOoEF1Y8QkW7QHvxPGYkrgj8fUhO2+haxuue5erF+fUk504jvDjTgLEhAMACeo6RxR7mzLizgtzNtaZerQb1F4ZSDSt4Liim8Exzx164p+Mzfb6mhvTsEw8atJyDAY1J2lXjBAiE6dwJNDRLhGmHhO0wM5pA x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SN6PR11MB2574.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(346002)(39860400002)(376002)(366004)(136003)(396003)(52536014)(2906002)(8936002)(33656002)(8676002)(110136005)(54906003)(478600001)(71200400001)(64756008)(66556008)(66476007)(5660300002)(9686003)(83380400001)(66446008)(186003)(86362001)(4744005)(316002)(6506007)(53546011)(55016002)(26005)(7696005)(66946007)(76116006)(4326008); DIR:OUT; SFP:1102; x-ms-exchange-antispam-messagedata: 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 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB2574.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 92867ce1-eee2-47b5-0081-08d85e5218f1 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Sep 2020 17:16:37.0102 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: dYH3zc50hibPXgZEmFBxfBd/kvbujzojGE3l9ydhnqWgi2j3wJSDDc5U4L37J+2tG3d1LHfTsUET8dszic+rzw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR11MB3295 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] [PATCH 2/5] lib/stack: remove push acquire fence X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > -----Original Message----- > From: Steven Lariau > Sent: Friday, September 11, 2020 10:30 AM > To: Eads, Gage ; Olivier Matz > Cc: dev@dpdk.org; nd@arm.com; dharmik.thakkar@arm.com; Steven Lariau > > Subject: [PATCH 2/5] lib/stack: remove push acquire fence >=20 > An acquire fence is used to make sure loads after the fence can observe > all store operations before a specific store-release. > But push doesn't read any data, except for the head which is part of a > CAS operation (the items on the list are not read). > So there is no need for the acquire barrier. >=20 > Signed-off-by: Steven Lariau > Reviewed-by: Dharmik Thakkar > Reviewed-by: Ruifeng Wang Acked-by: Gage Eads Thanks, Gage