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=-8.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 DBF65C433DF for ; Tue, 18 Aug 2020 07:40:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E0A4207FB for ; Tue, 18 Aug 2020 07:40:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (3072-bit key) header.d=samba.org header.i=@samba.org header.b="FdYwbJaY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726370AbgHRHkv (ORCPT ); Tue, 18 Aug 2020 03:40:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726324AbgHRHka (ORCPT ); Tue, 18 Aug 2020 03:40:30 -0400 Received: from hr2.samba.org (hr2.samba.org [IPv6:2a01:4f8:192:486::2:0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21746C061389 for ; Tue, 18 Aug 2020 00:40:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=samba.org; s=42; h=Date:Message-ID:From:Cc:To; bh=1au0pzg1MpklIR+2siKFTYivtNcD47EFhS98zuXc+Wg=; b=FdYwbJaYTXad79unbvYR53CzM4 5kKWi6zQvyyTB7BXO7BOyUhJdoy9o/i2ZwtHUV+GhHpTefQuyHpq6qzWuxABIGkRP289c9+nk6ITh Xpj7nZcVtF6gLW40y+wCHWOVDtlGs4TR/FbCdkBdpeF0ozJU+pPwhWjvOXuazk0DtKVQmPpwdaNXF THVN5nzVySd9k4L93vfYCpHxgsIlApiEzE4aaY94H1GAzcUFz7FnZYyd7/ztXWongGG3EjAkB71iW JF+YWUHLd6NHcjrkH9Q+QjlDKUc8QprQpmO9eoOM5uyUn64kB4GiqQFgM/EOeY7Nn81e+r+MSRR4c FhlamCSrW2gmmvAubqmm1FbzYy53QJzVC8B8iCUn8OHLGiuYvVuw9HUJm01j5QqEGYhiYwWOO3+J2 CVutB6OBcRBhn8e4FHkQ6oYVz/7DHdvEyVMrWaQBCxFdiEbosgtjpM9jglve0V3nBijmDdBOzCyaE D3hpFfY52N+BqQ+YGSB20ERj; Received: from [127.0.0.2] (localhost [127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim) id 1k7wEG-0003Ss-Jj; Tue, 18 Aug 2020 07:40:21 +0000 To: Jens Axboe , io-uring@vger.kernel.org, Anoop C S Cc: david@fromorbit.com, jmoyer@redhat.com References: <20200814195449.533153-1-axboe@kernel.dk> <4c79f6b2-552c-f404-8298-33beaceb9768@samba.org> <8beb2687-5cc3-a76a-0f31-dcfa9fc4b84b@kernel.dk> <97c2c3ab-d25b-e6bb-e8aa-a551edecc7b5@kernel.dk> From: Stefan Metzmacher Autocrypt: addr=metze@samba.org; prefer-encrypt=mutual; keydata= xsNNBFYI3MgBIACtBo6mgqbCv5vkv8GSjJH607nvXIT65moPUe6qAm2lYPP6oZUI5SNLhbO3 rMYfMxBFfWS/0WF8840mDvhqPI+lJGfvJ1Y2r8a9JPuqsk6vwLedv62TQe5J3qMCR2y4TTK1 Pkqss3P9kqWn5SVXntAYjLT06Qh96gQ9la9qwj6+izqMdAoGFt5ak7Sw7jJ06U3AawZDawb2 +4q7KwaDwTWeUifIC54tXp+au5Q17rhKq94LTcdptkLfC5ix2cyApsr84El/82LFUOzZdyRA 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6BtxjNLkO1lkOEwohqok+rfUeRp9pNo8p7ipBw3WE4vDu/65LQQHJ/CfQGlH9V6g2DGIaACD WpRGKzYZpvpGBhGYcTngLO1sshD9hhF8m/lEUd1TcmLnEJ0hl4+88zeCyREINYt0RcIME8au v32RTwPDQ+r7LB56mKDXL3ijZlUHXIAKkc+1XsCbJTXDB5oYi86xrCl6Z8TfKP5kR3R8IEG0 DHimFW86BtuFMnBIYa342y2zjAwYiKHh/KE4EdgtDXviGMFygUrfPxOyVo1mWA5WveCsw1U3 BnYZ/lIyAQwDUyuZ6QWx2Sqos3CmTxB4DhczBAGDyVKyKx1C7UO9t8PkI4E+nw176gYidOGG EKit9OEborPdR8HrP4f8CTgPCUI0uIQTYswHH9HhSq8d1maM+4SmsvoQT+s4lt8kvJp9ce6B uWrtpKE+BrlhmZrZleospHp05F+oHuE7lrOg09g0SFdTigqSJNbN1R/pkPI5Q03GfbWipsd4 iY0Rj0D34DQVeKAa4qUlOcBgX2D9VHRap9GKQRWs//egCueqDZNmIk3071aFV+BSiBSTZIIG t/YZOE37yKSj2rcCbqg= Subject: Re: [PATCHSET v2 0/2] io_uring: handle short reads internally Message-ID: <5f6d3f16-cd0c-9598-4484-6003101eb47a@samba.org> Date: Tue, 18 Aug 2020 09:40:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="zerE6OqMJ26MxfUqwGmpeR1kG5jb27p2t" 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) --zerE6OqMJ26MxfUqwGmpeR1kG5jb27p2t Content-Type: multipart/mixed; boundary="Dmp8HD6zXUkzFSSAsPrxq37fYg4yhImZh"; protected-headers="v1" From: Stefan Metzmacher To: Jens Axboe , io-uring@vger.kernel.org, Anoop C S Cc: david@fromorbit.com, jmoyer@redhat.com Message-ID: <5f6d3f16-cd0c-9598-4484-6003101eb47a@samba.org> Subject: Re: [PATCHSET v2 0/2] io_uring: handle short reads internally References: <20200814195449.533153-1-axboe@kernel.dk> <4c79f6b2-552c-f404-8298-33beaceb9768@samba.org> <8beb2687-5cc3-a76a-0f31-dcfa9fc4b84b@kernel.dk> <97c2c3ab-d25b-e6bb-e8aa-a551edecc7b5@kernel.dk> In-Reply-To: --Dmp8HD6zXUkzFSSAsPrxq37fYg4yhImZh Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi Jens, >>>> Will this be backported? >>> >>> I can, but not really in an efficient manner. It depends on the async= >>> buffered work to make progress, and the task_work handling retry. The= >>> latter means it's 5.7+, while the former is only in 5.9+... >>> >>> We can make it work for earlier kernels by just using the thread offl= oad >>> for that, and that may be worth doing. That would enable it in >>> 5.7-stable and 5.8-stable. For that, you just need these two patches.= >>> Patch 1 would work as-is, while patch 2 would need a small bit of >>> massaging since io_read() doesn't have the retry parts. >>> >>> I'll give it a whirl just out of curiosity, then we can debate it aft= er >>> that. >> >> Here are the two patches against latest 5.7-stable (the rc branch, as >> we had quite a few queued up after 5.9-rc1). Totally untested, just >> wanted to see if it was doable. >> >> First patch is mostly just applied, with various bits removed that we >> don't have in 5.7. The second patch just does -EAGAIN punt for the >> short read case, which will queue the remainder with io-wq for >> async execution. >> >> Obviously needs quite a bit of testing before it can go anywhere else,= >> but wanted to throw this out there in case you were interested in >> giving it a go... >=20 > Actually passes basic testing, and doesn't return short reads. So at > least it's not half bad, and it should be safe for you to test. >=20 > I quickly looked at 5.8 as well, and the good news is that the same > patches will apply there without changes. Thanks, but I was just curios and I currently don't have the environment = to test, sorry. Anoop: you helped a lot reproducing the problem with 5.6, would you be ab= le to test the kernel patches against 5.7 or 5.8, while reverting the samba pat= ches? See https://lore.kernel.org/io-uring/e22220a8-669a-d302-f454-03a35c9582b4= @kernel.dk/T/#t for the whole discussion? metze --Dmp8HD6zXUkzFSSAsPrxq37fYg4yhImZh-- --zerE6OqMJ26MxfUqwGmpeR1kG5jb27p2t Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEfFbGo3YXpfgryIw9DbX1YShpvVYFAl87heAACgkQDbX1YShp vVaVshAAq5oNxPf9c8h2m8eI6vNCfsV/QBnfoIQyJ1RFU/I/Sp+9N5xOfw13Uhpe s1b9OZZ7V4yh2ye4jYUtUA7b1iwzR0liP99VS/l4LAQVUUaKwul7HYNPxzOpnoeu DKFVLbyGDPXqObYI6WUzAOXGYnq2VnoFKd7zOlD8K6+hArlUwFU+e6zTcp6LAVXQ 1boV/I+LZFsh8RkLm5apOiJOEMmj93j7GrtiupQZGMyGFDi6VyJ/Hza0USOZyqVO tIpvkfudiCrcEhVGceIv/aQh/zKNoUhhEo7/vfufaVxXknVfPLt5u3VkqqZggTOE m7NA+TCzVMzwTpIS21NECn9dWpy39P3QWESrI/2eAApsSeC3pkskBI19M5cCu1M5 JzeAtVbKFi4Jff/RbXh4NAcHY8KYvy+gTCgZvaO3oZ13ANn6ITdo0+H91BFXdpip fWXX/zMDX9rmztA+8ps1IBOc5/lTABaibJD6VaGJC43L3rPzg6Q0qPzHU/vIRzqU 97/pwaPcrtBMoHuhxBxAamMekR+kARFL7xaR0/HtzCxQNfmBZFFdD19cr1W/K/hp qTF3/clWZ71QIna0Q36B/aTu62oTMwNAcfvcsHBKXdKLHB91W1h+AljDH0s9ONQQ 6Kr5PcZ1hxn5eoHtA34wt/m7voTVs+DY1MUyzpAHDQvsDv4rSbA= =Beha -----END PGP SIGNATURE----- --zerE6OqMJ26MxfUqwGmpeR1kG5jb27p2t--