From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id B2CE5A05D3 for <public@inbox.dpdk.org>; Wed, 24 Apr 2019 12:12:21 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id BB1101B4E0; Wed, 24 Apr 2019 12:12:20 +0200 (CEST) Received: from EUR04-VI1-obe.outbound.protection.outlook.com (mail-eopbgr80074.outbound.protection.outlook.com [40.107.8.74]) by dpdk.org (Postfix) with ESMTP id B30DE1B399 for <dev@dpdk.org>; Wed, 24 Apr 2019 12:12:19 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector1-arm-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9eBx9S8NBXLiYkEK0/Hrgw/fwzmR7PAx9wmgPUhv0/o=; b=rY3xiYlmb2wff5Lqd4KG1iABpyXOXNuiKP2VYyUjNpUPLoWnymeRPEfu0au0LA5G2dkHSYqs+KEIVUx7vmCTpYnnw675annKv68MMAS9qrYVIbQoyeZXr2Yi7ZQULsFf2d8+S1SrKXw2ockkg1X0VA54+mWMPMHHbqSm6uP8/b4= Received: from AM0PR08MB4418.eurprd08.prod.outlook.com (20.179.35.207) by AM0PR08MB4242.eurprd08.prod.outlook.com (20.179.36.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1835.12; Wed, 24 Apr 2019 10:12:17 +0000 Received: from AM0PR08MB4418.eurprd08.prod.outlook.com ([fe80::21aa:85a4:d79:8f94]) by AM0PR08MB4418.eurprd08.prod.outlook.com ([fe80::21aa:85a4:d79:8f94%5]) with mapi id 15.20.1813.017; Wed, 24 Apr 2019 10:12:17 +0000 From: "Ruifeng Wang (Arm Technology China)" <Ruifeng.Wang@arm.com> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>, "konstantin.ananyev@intel.com" <konstantin.ananyev@intel.com>, "stephen@networkplumber.org" <stephen@networkplumber.org>, "paulmck@linux.ibm.com" <paulmck@linux.ibm.com>, "marko.kovacevic@intel.com" <marko.kovacevic@intel.com>, "dev@dpdk.org" <dev@dpdk.org> CC: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>, "Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>, Dharmik Thakkar <Dharmik.Thakkar@arm.com>, Malvika Gupta <Malvika.Gupta@arm.com>, nd <nd@arm.com> Thread-Topic: [dpdk-dev] [PATCH v7 3/3] doc/rcu: add lib_rcu documentation Thread-Index: AQHU+Y7Th+SsNtJeTUOHJF4AoiLi66ZLGGXA Date: Wed, 24 Apr 2019 10:12:17 +0000 Message-ID: <AM0PR08MB4418F2A36F0272030D19C0329E3C0@AM0PR08MB4418.eurprd08.prod.outlook.com> References: <20181122033055.3431-1-honnappa.nagarahalli@arm.com> <20190423043130.18153-1-honnappa.nagarahalli@arm.com> <20190423043130.18153-4-honnappa.nagarahalli@arm.com> In-Reply-To: <20190423043130.18153-4-honnappa.nagarahalli@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Ruifeng.Wang@arm.com; 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DIR:OUT; SFP:1101; SCL:1; SRVR:AM0PR08MB4242; H:AM0PR08MB4418.eurprd08.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: q23GqN/jkreFEyMVdvksHjV36qx+40A+XHab2TDmnqS5nXELOWxC8Bl/im2XxsDWyCClACSMzrSIclgSpWzEkmw7649UBqyW4OPHc7SNGhfLqyAiI8aCSBGxgvOt+Ox6FBDjL7LEKnu3YBhPbfbyCtuFtEf1stNA9pEEMkdzMCERMS48yqFazNkkslWHBdzo7xH+ItltD2XKB/ZHgqMYg9FEcGCykkvs9MGZwnk9YvthrOKLoEmGKazyGytlNLviICI5VyHFTEQbxhLHK01szCgqOKZK0wod4hUG/txjVITh28NRf4+c2D4Wqlwf+77bqF14eTl2drd/68JfI4HLl6QrBQUjrau4DfBJociYEkFxNZRwaw+e2r1CFPVnPnhb/BpWJhxMV7tCVVwiCEjv2+wEf8zpM7u+ilJ9MokOFaI= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7c3d1d3b-ef14-4ada-d35f-08d6c89d54ca X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Apr 2019 10:12:17.6702 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB4242 Subject: Re: [dpdk-dev] [PATCH v7 3/3] doc/rcu: add lib_rcu documentation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> Message-ID: <20190424101217.yQ2-bS3LeJ5H-VIbP8kPEapZdgMd6vgqGWSgkacq5zE@z> Hi Honnappa, > -----Original Message----- > From: dev <dev-bounces@dpdk.org> On Behalf Of Honnappa Nagarahalli > Sent: Tuesday, April 23, 2019 12:32 > To: konstantin.ananyev@intel.com; stephen@networkplumber.org; > paulmck@linux.ibm.com; marko.kovacevic@intel.com; dev@dpdk.org > Cc: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>; Gavin Hu (Arm > Technology China) <Gavin.Hu@arm.com>; Dharmik Thakkar > <Dharmik.Thakkar@arm.com>; Malvika Gupta <Malvika.Gupta@arm.com> > Subject: [dpdk-dev] [PATCH v7 3/3] doc/rcu: add lib_rcu documentation >=20 *snip* > +Let us consider the following diagram: > + > +.. figure:: img/rcu_general_info.* > + > + > +As shown, reader thread 1 accesses data structures D1 and D2. When it > +is accessing D1, if the writer has to remove an element from D1, the > +writer cannot free the memory associated with that element immediately. > +The writer can return the memory to the allocator only after the reader > +stops referencing D1. In other words, reader thread RT1 has to enter a > +quiescent state. > + > +Similarly, since reader thread 2 is also accessing D1, writer has to > +wait till thread 2 enters quiescent state as well. > + > +However, the writer does not need to wait for reader thread 3 to enter > +quiescent state. Reader thread 3 was not accessing D1 when the delete > +operation happened. So, reader thread 1 will not have a reference to ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ thread 3 ? > +the deleted entry. > + *snip*