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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28E71C433EF for ; Thu, 14 Jul 2022 07:46:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229754AbiGNHqR convert rfc822-to-8bit (ORCPT ); Thu, 14 Jul 2022 03:46:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236045AbiGNHqQ (ORCPT ); Thu, 14 Jul 2022 03:46:16 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 29CDD1FCC0 for ; Thu, 14 Jul 2022 00:46:14 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mtapsc-2-mZeh0vbrPpqDvlEaKMiibQ-1; Thu, 14 Jul 2022 08:46:11 +0100 X-MC-Unique: mZeh0vbrPpqDvlEaKMiibQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.36; Thu, 14 Jul 2022 08:46:10 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.036; Thu, 14 Jul 2022 08:46:10 +0100 From: David Laight To: 'Dylan Yudaken' , Jens Axboe , "Pavel Begunkov" , "davem@davemloft.net" , "edumazet@google.com" , "kuba@kernel.org" , "pabeni@redhat.com" , "io-uring@vger.kernel.org" CC: "netdev@vger.kernel.org" , "Kernel-team@fb.com" Subject: RE: [PATCH v2 for-next 3/3] io_uring: support multishot in recvmsg Thread-Topic: [PATCH v2 for-next 3/3] io_uring: support multishot in recvmsg Thread-Index: AQHYlpI5075XXmpT5EGvlEm+mgTHvK19fcuQ Date: Thu, 14 Jul 2022 07:46:10 +0000 Message-ID: <27f219d07e4e4ce4bfb3263d8d94eae6@AcuMS.aculab.com> References: <20220713082321.1445020-1-dylany@fb.com> <20220713082321.1445020-4-dylany@fb.com> In-Reply-To: <20220713082321.1445020-4-dylany@fb.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Dylan Yudaken > Sent: 13 July 2022 09:23 > > Similar to multishot recv, this will require provided buffers to be > used. However recvmsg is much more complex than recv as it has multiple > outputs. Specifically flags, name, and control messages. ... Why is this any different from adding several 'recvmsg' requests into the request ring? IIUC the requests are all processed sequentially by a single thread. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)