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Mon, 06 Apr 2020 13:02:49 -0700 (PDT) Received: from [192.168.43.134] ([109.126.129.227]) by smtp.gmail.com with ESMTPSA id t2sm9596367wrs.7.2020.04.06.13.02.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Apr 2020 13:02:48 -0700 (PDT) To: Askar Safin Cc: io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe References: <1586200181.435329676@f412.i.mail.ru> 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== Subject: Re: [POC RFC 0/3] splice(2) support for io_uring Message-ID: <59c447cb-46b5-ac9d-3fdd-94d029e7f5dc@gmail.com> Date: Mon, 6 Apr 2020 23:01:44 +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: <1586200181.435329676@f412.i.mail.ru> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="XeXf2vlNfgg9vaeMUWcOxYZdYkCoLmWN3" 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) --XeXf2vlNfgg9vaeMUWcOxYZdYkCoLmWN3 Content-Type: multipart/mixed; boundary="J7LH82WWimjZtr0j91XWX2urDE1jPHLqz"; protected-headers="v1" From: Pavel Begunkov To: Askar Safin Cc: io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe Message-ID: <59c447cb-46b5-ac9d-3fdd-94d029e7f5dc@gmail.com> Subject: Re: [POC RFC 0/3] splice(2) support for io_uring References: <1586200181.435329676@f412.i.mail.ru> In-Reply-To: <1586200181.435329676@f412.i.mail.ru> --J7LH82WWimjZtr0j91XWX2urDE1jPHLqz Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 06/04/2020 22:09, Askar Safin wrote: > Hi. Thanks for your splice io_uring patch. Maybe it will be good idea t= o add uring operation, which will unify splice, sendfile and copy_file_ra= nge instead of just IORING_OP_SPLICE? It doesn't have to follow splice(2) semantics, so can be extended, in the= ory. Though I don't see much profit in doing that for now. sendfile(2) is done= by splicing through an internal pipe, and this pipe will complicate things f= or io-wq (i.e. io_uring's thread pool). On the other hand, it'd be of the sa= me performance and even more flexible to send 2 linked splice requests with = a pre-allocated pipe from the userspace. --=20 Pavel Begunkov --J7LH82WWimjZtr0j91XWX2urDE1jPHLqz-- --XeXf2vlNfgg9vaeMUWcOxYZdYkCoLmWN3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE+6JuPTjTbx479o3OWt5b1Glr+6UFAl6Liq0ACgkQWt5b1Glr +6V/Cg/8DGMAtp8WL98iaVAYYfHeJZ7g4Rr/XylbWMSHl1gDBvYgdz5tItBu1XJn V890nJDW+pvpMKVPc6wg5f0zEEnpFa6+sLOiyZzNYxvqRcO/Dq2mTNHXWa2A4v1F xlcagtY9QmKE6mp8IOQMQGLhvdacqEMY36h9qzb7l0m9ZYkWDy0UgHvKtWxc5m2Z jPjH8983jqhYZJnjkHtpeOzDWcn8+g3YB4rwwo/npqxtfkEL0YsH53Og3/ryVFbE saSVNmtVGKV3bYh4DnWySU4KDI26DxqJnZgDBC9VlpCssQFkBSphwJzoaf2HbQFe /2cS3kIb4t1UKwj3bYLML2gNSy7iMqdx/DPzhGvpEVK+DQxmvMPEXDNe39xNdSDU u0SWAOLi3hbSdWYPGtrHkLHGPPmXvtg4p1nTNO3bD+tqkZyDZiKw0Ma5XnqodS43 TFGHpfqQMyI/S/siGt1Zf0Lrm85inT4uNf0i54hhH4hLJz3YP9vZ56T9VPJ3u1E3 WI6rFeFNRJLpPVRelVWyv/xD8SCPd3ok+pLBK3UYMVa2mIX7d/KqhfDKf9iIARtA W15K4olNf8NwSsqNsODjYkVX5imlZkmELNS4I/Fpo4iEk37EfJ5gOCOtE+xr//G1 H5Q9hmqtyXu119/phXApZSWO6t7XgSMUAgzVpIz/eondEvTg31k= =R4jo -----END PGP SIGNATURE----- --XeXf2vlNfgg9vaeMUWcOxYZdYkCoLmWN3--