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[127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim) id 1lDFRX-0001Mv-TW; Fri, 19 Feb 2021 23:44:15 +0000 To: Jens Axboe , io-uring@vger.kernel.org Cc: ebiederm@xmission.com, viro@zeniv.linux.org.uk, torvalds@linux-foundation.org References: <20210219171010.281878-1-axboe@kernel.dk> From: Stefan Metzmacher Autocrypt: addr=metze@samba.org; prefer-encrypt=mutual; keydata= mQQNBFYI3MgBIACtBo6mgqbCv5vkv8GSjJH607nvXIT65moPUe6qAm2lYPP6oZUI5SNLhbO3 rMYfMxBFfWS/0WF8840mDvhqPI+lJGfvJ1Y2r8a9JPuqsk6vwLedv62TQe5J3qMCR2y4TTK1 Pkqss3P9kqWn5SVXntAYjLT06Qh96gQ9la9qwj6+izqMdAoGFt5ak7Sw7jJ06U3AawZDawb2 +4q7KwaDwTWeUifIC54tXp+au5Q17rhKq94LTcdptkLfC5ix2cyApsr84El/82LFUOzZdyRA 7VS8gkhuAZG7tM1MbCIbGk0O3SFlT+CvZczfjtoxVdjYvGRDwBFlSIUwo3Os2aStstvYog7r r9vujWGSf5odBSogRvACCFwuGLVUBSBw/If0Wb0WgHnkdVcKfjNpznBqUfG6mGhnQMv3KlbM rprYTGBOn/Ufjw7zG6Et2UrmnHKbnSs1sG+Ka4Qg4uRM45xlNKn1SYJVSd1DnUqF1kwK2ncx r5BjxEfMfNHYxEFuXCFNusT0x3gb6zSBPlmM+GEaV26Q/9Wpv2kiaMnNJ9ZzkafSF52TgrGo 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rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210219171010.281878-1-axboe@kernel.dk> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="iwb8N0I8EpmnZG6hS8bBSNIeV55Kp3hCE" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --iwb8N0I8EpmnZG6hS8bBSNIeV55Kp3hCE Content-Type: multipart/mixed; boundary="LEG3kBBgwVvtpePyCUKY5ZlpImvty8w2Y"; protected-headers="v1" From: Stefan Metzmacher To: Jens Axboe , io-uring@vger.kernel.org Cc: ebiederm@xmission.com, viro@zeniv.linux.org.uk, torvalds@linux-foundation.org Message-ID: Subject: Re: [PATCHSET RFC 0/18] Remove kthread usage from io_uring References: <20210219171010.281878-1-axboe@kernel.dk> In-Reply-To: <20210219171010.281878-1-axboe@kernel.dk> --LEG3kBBgwVvtpePyCUKY5ZlpImvty8w2Y Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi Jens, > tldr - instead of using kthreads that assume the identity of the origin= al > tasks for work that needs offloading to a thread, setup these workers a= s > threads of the original task. >=20 > Here's a first cut of moving away from kthreads for io_uring. It passes= > the test suite and various other testing I've done with it. It also > performs better, both for workloads actually using the async offload, b= ut > also in general as we slim down structures and kill code from the hot p= ath. >=20 > The series is roughly split into these parts: >=20 > - Patches 1-6, io_uring/io-wq prep patches > - Patches 7-8, Minor arch/kernel support > - Patches 9-15, switch from kthread to thread, remove state only needed= > for kthreads > - Patches 16-18, remove now dead/unneeded PF_IO_WORKER restrictions >=20 > Comments/suggestions welcome. I'm pretty happy with the series at this > point, and particularly with how we end up cutting a lot of code while > also unifying how sync vs async is presented. Thanks a lot! I was thinking hard about how to make all this easier to un= derstand and perform better in order to have the whole context available natively = for sendmsg/recvmsg, but also for the upcoming uring_cmd(). And now all that code magically disappeared completely, wonderful :-) metze --LEG3kBBgwVvtpePyCUKY5ZlpImvty8w2Y-- --iwb8N0I8EpmnZG6hS8bBSNIeV55Kp3hCE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEfFbGo3YXpfgryIw9DbX1YShpvVYFAmAwTUoACgkQDbX1YShp vVZNaxAAhV9j3Dj8yeCQhCgkJbeBV7FvT6GBtBbEW0f3pqMaF+D0bdrsyLJIfFOR v841XZ5jTzxPrFsFrzA5+qU8nLqYJSxT/Rt6nrub00CdpPZXH6zfa82ZWYjik1t0 Wcamj57nm6YJ9srr++RhYfttUfSKb5uWcoJ5V3r7jWXOY1J06Wz//pfwtHW7oiml y3QYfYba3K3D/366c7t1tKuM1kQMxNJ2ZW1I2YZSwWzL+UGBcrlkvVe5m8tTtAOD OHGMrvAQfmtf94VEyFmNLtkXc6T4VgXyf6aIXuflyitz4AbbUyLTqj74n66NknJf 09DIjbR9U9bpWo9Io6Yy5TLYhGVhnBY3MKTi66dcJ4H/rVHhYGDiLkhS8fignM/v m7DCixYJNu97Z4v6rRKJf8RGgc2gU4fu0x3/FqcCuPQ8jDwzLcqrMeS3lZUXdls9 il2gtUt8Wtz+Ot4KFjLxv2k/T/+zsM9ojrjDy28XIcWobY0leCDES0uV27mbh4/r OYNs4ojD2MFDlI4FAaS6QErPq+1CjNVbHRZmvmubyoIt+7d+DF3eoea3ypUZk2XX 63jWnQ3LVOsbd7YQ7/84tOmDSrC0f3owVlRhnN6qeNQRVaPRuT4GAAdBTWjw/ZRI 67x1pxMnOxE4SDn/w3MRVgRO5wknBeUc4E5cXvqd1UAG/mkGtrs= =Eprn -----END PGP SIGNATURE----- --iwb8N0I8EpmnZG6hS8bBSNIeV55Kp3hCE--