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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 D1579C33C9E for ; Fri, 17 Jan 2020 22:28:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8CE072072B for ; Fri, 17 Jan 2020 22:28:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="DMsTOGZw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726857AbgAQW2f (ORCPT ); Fri, 17 Jan 2020 17:28:35 -0500 Received: from mail-wr1-f65.google.com ([209.85.221.65]:45909 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726587AbgAQW2e (ORCPT ); Fri, 17 Jan 2020 17:28:34 -0500 Received: by mail-wr1-f65.google.com with SMTP id j42so24115686wrj.12; Fri, 17 Jan 2020 14:28:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to; bh=8JPjIxD10BTQb1e/iWLXlur2yHk2O/VzlHp27Zd/HJs=; b=DMsTOGZwyughl1o0lXhD/85M9Q3yWijyN8lJwVjsWLLHe6no5/qhMy73mi4M000Htc 23Wy6hXVBbs7cCqryvkhMav9WLWJ3eLWx9AO2o9b54zAHkqiLkSxVdGsxwp0HGL9QPFN c09VHCtkeNicP1iEprEucTyqzVUxpcKndixe+9IM99osOcXxqGfRm6owfYF+qRsVkrbH 0vGhZybq6LSKS3qvkGZAhldnkiwDIHPuHTWR/jFRARZCl8Dg04MO0we26OOyo/NYsmV5 XB1MOFYAO/uvI5aQPMPBaWXC4poFHyqf/iY4rXtUyoywxRFJZyWrY8U0wiVcNvk+ZBwX rUAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to; bh=8JPjIxD10BTQb1e/iWLXlur2yHk2O/VzlHp27Zd/HJs=; b=t+t/woM5riG9gkDx27eRKAzJO3k8N4rnRMdaXrGVhbg1nXSGMFFRcXeQRCLpERwST0 ITLU0RdOEw2rQ8Qbdm9HlouYdV80gGVsTxNxsEpuIzwF9unLK59V+L7mxROBAbAFENkM zl0679RmSuOR90WlqL9Kb2InwD+wU3IjNiI7vtDs8URKh9SC2INf7P4dt3aht3b7yInQ L1eGKtS0JXvY6O7w6Spv5ZGEItvzfk3AuRqm7bIa51y+XcLtjqfnRY4fqIyafuzK2BTK BLeiYHmLQXhgR7Va/2MqbPQyVwb9SND2BU41t8Rhp43TEe6CbjylQqv9+wSbGd+kAiad ycHQ== X-Gm-Message-State: APjAAAVnC8nKAqCqZgaA3i1FRKDK2Y5BILhQWKxtnlT+MnvQ0niZJ4ww g414lN5eHfOAqH4/7jAH+6EtkQwns6s= X-Google-Smtp-Source: APXvYqwEWbrdbeXQFO3shXbcYptLKb0X9680xsUI1My//MSwsyDdPBQh1JJD0jOR4TsSwlcSbE8qGA== X-Received: by 2002:a5d:6a10:: with SMTP id m16mr5261902wru.411.1579300111596; Fri, 17 Jan 2020 14:28:31 -0800 (PST) Received: from [192.168.43.134] ([109.126.145.157]) by smtp.gmail.com with ESMTPSA id f12sm952792wmf.28.2020.01.17.14.28.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Jan 2020 14:28:31 -0800 (PST) Subject: Re: [PATCHSET v2 0/6] io_uring: add support for open/close To: Jens Axboe , Colin Walters , Stefan Metzmacher , io-uring@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org References: <20200107170034.16165-1-axboe@kernel.dk> <4adb30f4-2ab3-6029-bc94-c72736b9004a@kernel.dk> <4dffd58e-5602-62d5-d1af-343c4a091ed9@samba.org> <9a407238-5505-c446-80b7-086646dd15be@kernel.dk> <1e8a9e98-67f8-4e2f-8185-040b9979bc1a@www.fastmail.com> <964c01cc-94f5-16b2-cc61-9ee5789b1f43@gmail.com> From: Pavel Begunkov Autocrypt: addr=asml.silence@gmail.com; prefer-encrypt=mutual; keydata= mQINBFmKBOQBEAC76ZFxLAKpDw0bKQ8CEiYJRGn8MHTUhURL02/7n1t0HkKQx2K1fCXClbps bdwSHrhOWdW61pmfMbDYbTj6ZvGRvhoLWfGkzujB2wjNcbNTXIoOzJEGISHaPf6E2IQx1ik9 6uqVkK1OMb7qRvKH0i7HYP4WJzYbEWVyLiAxUj611mC9tgd73oqZ2pLYzGTqF2j6a/obaqha +hXuWTvpDQXqcOZJXIW43atprH03G1tQs7VwR21Q1eq6Yvy2ESLdc38EqCszBfQRMmKy+cfp W3U9Mb1w0L680pXrONcnlDBCN7/sghGeMHjGKfNANjPc+0hzz3rApPxpoE7HC1uRiwC4et83 CKnncH1l7zgeBT9Oa3qEiBlaa1ZCBqrA4dY+z5fWJYjMpwI1SNp37RtF8fKXbKQg+JuUjAa9 Y6oXeyEvDHMyJYMcinl6xCqCBAXPHnHmawkMMgjr3BBRzODmMr+CPVvnYe7BFYfoajzqzq+h EyXSl3aBf0IDPTqSUrhbmjj5OEOYgRW5p+mdYtY1cXeK8copmd+fd/eTkghok5li58AojCba jRjp7zVOLOjDlpxxiKhuFmpV4yWNh5JJaTbwCRSd04sCcDNlJj+TehTr+o1QiORzc2t+N5iJ NbILft19Izdn8U39T5oWiynqa1qCLgbuFtnYx1HlUq/HvAm+kwARAQABtDFQYXZlbCBCZWd1 bmtvdiAoc2lsZW5jZSkgPGFzbWwuc2lsZW5jZUBnbWFpbC5jb20+iQJOBBMBCAA4FiEE+6Ju PTjTbx479o3OWt5b1Glr+6UFAlmKBOQCGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ Wt5b1Glr+6WxZA//QueaKHzgdnOikJ7NA/Vq8FmhRlwgtP0+E+w93kL+ZGLzS/cUCIjn2f4Q Mcutj2Neg0CcYPX3b2nJiKr5Vn0rjJ/suiaOa1h1KzyNTOmxnsqE5fmxOf6C6x+NKE18I5Jy xzLQoktbdDVA7JfB1itt6iWSNoOTVcvFyvfe5ggy6FSCcP+m1RlR58XxVLH+qlAvxxOeEr/e aQfUzrs7gqdSd9zQGEZo0jtuBiB7k98t9y0oC9Jz0PJdvaj1NZUgtXG9pEtww3LdeXP/TkFl HBSxVflzeoFaj4UAuy8+uve7ya/ECNCc8kk0VYaEjoVrzJcYdKP583iRhOLlZA6HEmn/+Gh9 4orG67HNiJlbFiW3whxGizWsrtFNLsSP1YrEReYk9j1SoUHHzsu+ZtNfKuHIhK0sU07G1OPN 2rDLlzUWR9Jc22INAkhVHOogOcc5ajMGhgWcBJMLCoi219HlX69LIDu3Y34uIg9QPZIC2jwr 24W0kxmK6avJr7+n4o8m6sOJvhlumSp5TSNhRiKvAHB1I2JB8Q1yZCIPzx+w1ALxuoWiCdwV M/azguU42R17IuBzK0S3hPjXpEi2sK/k4pEPnHVUv9Cu09HCNnd6BRfFGjo8M9kZvw360gC1 reeMdqGjwQ68o9x0R7NBRrtUOh48TDLXCANAg97wjPoy37dQE7e5Ag0EWYoE5AEQAMWS+aBV IJtCjwtfCOV98NamFpDEjBMrCAfLm7wZlmXy5I6o7nzzCxEw06P2rhzp1hIqkaab1kHySU7g dkpjmQ7Jjlrf6KdMP87mC/Hx4+zgVCkTQCKkIxNE76Ff3O9uTvkWCspSh9J0qPYyCaVta2D1 Sq5HZ8WFcap71iVO1f2/FEHKJNz/YTSOS/W7dxJdXl2eoj3gYX2UZNfoaVv8OXKaWslZlgqN jSg9wsTv1K73AnQKt4fFhscN9YFxhtgD/SQuOldE5Ws4UlJoaFX/yCoJL3ky2kC0WFngzwRF Yo6u/KON/o28yyP+alYRMBrN0Dm60FuVSIFafSqXoJTIjSZ6olbEoT0u17Rag8BxnxryMrgR dkccq272MaSS0eOC9K2rtvxzddohRFPcy/8bkX+t2iukTDz75KSTKO+chce62Xxdg62dpkZX xK+HeDCZ7gRNZvAbDETr6XI63hPKi891GeZqvqQVYR8e+V2725w+H1iv3THiB1tx4L2bXZDI DtMKQ5D2RvCHNdPNcZeldEoJwKoA60yg6tuUquvsLvfCwtrmVI2rL2djYxRfGNmFMrUDN1Xq F3xozA91q3iZd9OYi9G+M/OA01husBdcIzj1hu0aL+MGg4Gqk6XwjoSxVd4YT41kTU7Kk+/I 5/Nf+i88ULt6HanBYcY/+Daeo/XFABEBAAGJAjYEGAEIACAWIQT7om49ONNvHjv2jc5a3lvU aWv7pQUCWYoE5AIbDAAKCRBa3lvUaWv7pfmcEACKTRQ28b1y5ztKuLdLr79+T+LwZKHjX++P 4wKjEOECCcB6KCv3hP+J2GCXDOPZvdg/ZYZafqP68Yy8AZqkfa4qPYHmIdpODtRzZSL48kM8 LRzV8Rl7J3ItvzdBRxf4T/Zseu5U6ELiQdCUkPGsJcPIJkgPjO2ROG/ZtYa9DvnShNWPlp+R uPwPccEQPWO/NP4fJl2zwC6byjljZhW5kxYswGMLBwb5cDUZAisIukyAa8Xshdan6C2RZcNs rB3L7vsg/R8UCehxOH0C+NypG2GqjVejNZsc7bgV49EOVltS+GmGyY+moIzxsuLmT93rqyII 5rSbbcTLe6KBYcs24XEoo49Zm9oDA3jYvNpeYD8rDcnNbuZh9kTgBwFN41JHOPv0W2FEEWqe JsCwQdcOQ56rtezdCJUYmRAt3BsfjN3Jn3N6rpodi4Dkdli8HylM5iq4ooeb5VkQ7UZxbCWt UVMKkOCdFhutRmYp0mbv2e87IK4erwNHQRkHUkzbsuym8RVpAZbLzLPIYK/J3RTErL6Z99N2 m3J6pjwSJY/zNwuFPs9zGEnRO4g0BUbwGdbuvDzaq6/3OJLKohr5eLXNU3JkT+3HezydWm3W OPhauth7W0db74Qd49HXK0xe/aPrK+Cp+kU1HRactyNtF8jZQbhMCC8vMGukZtWaAwpjWiiH bA== Message-ID: <991faae8-909c-0aed-a9ee-aab01f8db8e9@gmail.com> Date: Sat, 18 Jan 2020 01:27:52 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="jrmhkb4217JCqyjHK9VDtwUxDX7rLuw1m" Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --jrmhkb4217JCqyjHK9VDtwUxDX7rLuw1m Content-Type: multipart/mixed; boundary="sIKRKxNYilBHMMIeIh2iO9vPEjp15S5Jt"; protected-headers="v1" From: Pavel Begunkov To: Jens Axboe , Colin Walters , Stefan Metzmacher , io-uring@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Message-ID: <991faae8-909c-0aed-a9ee-aab01f8db8e9@gmail.com> Subject: Re: [PATCHSET v2 0/6] io_uring: add support for open/close References: <20200107170034.16165-1-axboe@kernel.dk> <4adb30f4-2ab3-6029-bc94-c72736b9004a@kernel.dk> <4dffd58e-5602-62d5-d1af-343c4a091ed9@samba.org> <9a407238-5505-c446-80b7-086646dd15be@kernel.dk> <1e8a9e98-67f8-4e2f-8185-040b9979bc1a@www.fastmail.com> <964c01cc-94f5-16b2-cc61-9ee5789b1f43@gmail.com> In-Reply-To: --sIKRKxNYilBHMMIeIh2iO9vPEjp15S5Jt Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 17/01/2020 18:21, Jens Axboe wrote: > On 1/17/20 2:32 AM, Pavel Begunkov wrote: >> On 1/17/2020 3:44 AM, Colin Walters wrote: >>> On Thu, Jan 16, 2020, at 5:50 PM, Stefan Metzmacher wrote: >>>> The client can compound a chain with open, getinfo, read, close >>>> getinfo, read and close get an file handle of -1 and implicitly >>>> get the fd generated/used in the previous request. >>> >>> Sounds similar to https://capnproto.org/rpc.html too. >>> >> Looks like just grouping a pack of operations for RPC. >> With io_uring we could implement more interesting stuff. I've been >> thinking about eBPF in io_uring for a while as well, and apparently it= >> could be _really_ powerful, and would allow almost zero-context-switch= es >> for some usecases. >> >> 1. full flow control with eBPF >> - dropping requests (links) >> - emitting reqs/links (e.g. after completions of another req) >> - chaining/redirecting >> of course, all of that with fast intermediate computations in between >> >> 2. do long eBPF programs by introducing a new opcode (punted to async)= =2E >> (though, there would be problems with that) >> >> Could even allow to dynamically register new opcodes within the kernel= >> and extend it to eBPF, if there will be demand for such things. >=20 > We're also looking into exactly that at Facebook, nothing concrete yet > though. But it's clear we need it to take full advantage of links at > least, and it's also clear that it would unlock a lot of really cool > functionality once we do. >=20 > Pavel, I'd strongly urge you to submit a talk to LSF/MM/BPF about this.= > It's the perfect venue to have some concrete planning around this topic= > and get things rolling. Sounds interesting, I'll try this, but didn't you intend to do it yoursel= f? And thanks for the tip! >=20 > https://lore.kernel.org/bpf/20191122172502.vffyfxlqejthjib6@macbook-pro= -91.dhcp.thefacebook.com/ >=20 --=20 Pavel Begunkov --sIKRKxNYilBHMMIeIh2iO9vPEjp15S5Jt-- --jrmhkb4217JCqyjHK9VDtwUxDX7rLuw1m Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE+6JuPTjTbx479o3OWt5b1Glr+6UFAl4iNOgACgkQWt5b1Glr +6Xdcg/+NRft3M29OZEuBnldQz8531DA1mDvK9jt8hqEMq8Ki9dwLjxo0A8liPAA naIcQ7mea9CaYEwScvTIi+jhrNHEhgnyLACS7gnOy0yXyxyI66z8uqHiwj6yo05V DXs6G5V504ndEHH/BhcEV6TGzw1dY8n6RE01vWzH/X1t15RN3os19RjEvCIpUjja a3YxWbza8JmUGFSfuymj655IuLnimTXQcWm77epNKzrP97O1pmlmJ0HdF2tzG2gZ 6+mFRwZS+No0SN6E5M8ITnZBaadyVHZJoJ4FROvdtVwW9N5VKv/UQb2UrJtJ4lkO 5TjMxm35a19V1AsnJOSkPUJoqq1IxvZLwMlvJazDIn+Wrl3X/oge0z1SsTURGtfZ vAfSHylKXNZN8XzQEv5BFEmtDnOammYh5Js/FG2T/Mn5Rdl6STrr5GmtgVPGloc7 goehgnxQAR6E40D214SZLgQoRYyf/wdXUn4Y77W/MUVf0g4NpwDiNSCSWaXMcVdE gZnC9roF2hl0GWD+mFgqc6u7yqXJj1CM5V8rkralM7P8U3j3U8Lrk9y6Nciasbk2 v1S1SQvGt7a3nfTiXwpz/2EenL2q9ZW2eNpUPxoGCGTWQ0nfve/DeKurolh18AcY xEQnBDHGrNIvNBFLTEnEHyKy7bbcwMoWxM2deUhC7vnyeBU3tG4= =WrdO -----END PGP SIGNATURE----- --jrmhkb4217JCqyjHK9VDtwUxDX7rLuw1m--