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Sat, 01 Feb 2020 13:17:35 -0800 (PST) To: Jens Axboe , Andres Freund , io-uring@vger.kernel.org References: <20200201125350.vkkhezidm6ka6ux5@alap3.anarazel.de> <78A9EC3E-0961-4EF3-A226-1FCA34FAF818@anarazel.de> 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: liburing: expose syscalls? Message-ID: <6f5abe8a-1897-123d-d01d-d8c7c5fba7c4@gmail.com> Date: Sun, 2 Feb 2020 00:16:44 +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: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="APeBgFtPN5IFRnHr3edLYeVKJPF0Zcpx9" 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) --APeBgFtPN5IFRnHr3edLYeVKJPF0Zcpx9 Content-Type: multipart/mixed; boundary="oQEm7HgHDjEhC2BRRjKzl7V5nZCKYSuDi"; protected-headers="v1" From: Pavel Begunkov To: Jens Axboe , Andres Freund , io-uring@vger.kernel.org Message-ID: <6f5abe8a-1897-123d-d01d-d8c7c5fba7c4@gmail.com> Subject: Re: liburing: expose syscalls? References: <20200201125350.vkkhezidm6ka6ux5@alap3.anarazel.de> <78A9EC3E-0961-4EF3-A226-1FCA34FAF818@anarazel.de> In-Reply-To: --oQEm7HgHDjEhC2BRRjKzl7V5nZCKYSuDi Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 01/02/2020 20:52, Jens Axboe wrote: > On 2/1/20 10:49 AM, Andres Freund wrote: >> Hi,=20 >> >> On February 1, 2020 6:39:41 PM GMT+01:00, Jens Axboe = wrote: >>> On 2/1/20 5:53 AM, Andres Freund wrote: >>>> Hi, >>>> >>>> As long as the syscalls aren't exposed by glibc it'd be useful - at >>>> least for me - to have liburing expose the syscalls without really >>> going >>>> through liburing facilities... >>>> >>>> Right now I'm e.g. using a "raw" >>> io_uring_enter(IORING_ENTER_GETEVENTS) >>>> to be able to have multiple processes safely wait for events on the >>> same >>>> uring, without needing to hold the lock [1] protecting the ring [2].= =20 >>> It's >>>> probably a good idea to add a liburing function to be able to do so,= >>> but >>>> I'd guess there are going to continue to be cases like that. In a bi= t >>>> of time it seems likely that at least open source users of uring tha= t >>>> are included in databases, have to work against multiple versions of= >>>> liburing (as usually embedding libs is not allowed), and sometimes >>> that >>>> is easier if one can backfill a function or two if necessary. >>>> >>>> That syscall should probably be under a name that won't conflict wit= h >>>> eventual glibc implementation of the syscall. >>>> >>>> Obviously I can just do the syscall() etc myself, but it seems >>>> unnecessary to have a separate copy of the ifdefs for syscall number= s >>>> etc. >>>> >>>> What do you think? >>> >>> Not sure what I'm missing here, but liburing already has >>> __sys_io_uring_enter() for this purpose, and ditto for the register >>> and setup functions? >> >> Aren't they hidden to the outside by the symbol versioning script? >=20 > So you just want to have them exposed? I'd be fine with that. I'll > take a patch :-) >=20 Depends on how it's used, but I'd strive to inline __sys_io_uring_enter()= to remove the extra indirect call into the shared lib. Though, not sure a= bout packaging and all this stuff. May be useful to do that for liburing as we= ll. --=20 Pavel Begunkov --oQEm7HgHDjEhC2BRRjKzl7V5nZCKYSuDi-- --APeBgFtPN5IFRnHr3edLYeVKJPF0Zcpx9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE+6JuPTjTbx479o3OWt5b1Glr+6UFAl416skACgkQWt5b1Glr +6UrQg//X4xxrZegP/HmFxQOYuIMlV5HEpnvPiXJSwVrzGiCq3a62A2HwGB8YFT3 XSBgZGe6U8aA1dmi7X5s2K3+57bWt0zCKqWYs7mEsaeC8NQGe3ilpCW25WGqvy0c v1BCemg/C3me/bYrJfkTEqwrb4Pg4FPUm0vpMikWbbm+tMvVVcfzQEuZ+wc5yaKx IOlXNqBqLp+6fhEuPv/FapNq1C7lmGwJpPaVdwI42q9d60JVTy2rzeaZZqwQ7SfW le5kgHdI5dT4ADuJl/C3QxiKmqTsW4qvT2y3PVybbSoF469NMFk3BH5gfIVTavAz 3GRxtMvcg2QNSTN/BQnyhoXa+sZIMIQbni8atMGONaTm4cdwBi9mNptAOUhVfVub PHfb+S3TEuhVlt5Zk9WbmmAvk1xTmmCsMV3AKLB5FU7YPRdOxUDBSxf2WGmqK+ls VfkkHGnYY/ouej3xQLnUxPhW2V7mRPnLE65riL4hcNrI3xa0km/ADGIru7ijH7EH buvmckbDrZgnbp7ikyMla/iESPtCdRuoz/RDfO/DFXBBwh8SZICuSBrRVDYdw8oz 7Lwhxx736lqS8RXQmJfkE1Ng9Q8sJ4XvjDY9M+3lS9UPRQSApC1P1+z/PMLmwTZ6 9/dksGu4tmIlUzyBa+eNeD+k7YpYWLFTJU6BR2ZSWlbsjBU1W1M= =4+nF -----END PGP SIGNATURE----- --APeBgFtPN5IFRnHr3edLYeVKJPF0Zcpx9--