Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp3916209pxu; Wed, 9 Dec 2020 04:03:40 -0800 (PST) X-Google-Smtp-Source: ABdhPJwoXFFlAK00pt4eg0LlaCzZao5UEU0eqHjajlAOu2GA65tQTOAyGnWuG8MDSnHrdDzu03Gh X-Received: by 2002:a50:f1c7:: with SMTP id y7mr1692083edl.184.1607515420103; Wed, 09 Dec 2020 04:03:40 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1607515420; cv=none; d=google.com; s=arc-20160816; b=MN1AK1tEYSG1j/JTXCcvmEfzRwmAlPM2KpSnjkUd6jTFkYM0Kq9coNsJxV7y1OIWRC H61H4lFtcH2vdA5yy2rKes57RVmyjhJRg/mwD/v4Z/iOBx99wCeY1n9AtTd3Izts/kOw psEWnD+tPsjXLth2YWnE7h3x3sW1SUW7fFydb4MnXhL/IDl2raGieR7tZmI6PM6hPvy4 8QS0ZfvzJV5yujPSoZqLB37F+m8eTOHOfdBkEOydlG6AtVjUkLT8dv+WLZDFrDPecidp aZsFn5jSZSO9Kvq8uISxowUp1rKSAl7VIAlutg/7rXh9oSPYlO96daoB78IaW9orXlJ0 zrVQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:subject :autocrypt:from:references:cc:to:dkim-signature; bh=YvDAWwj69k6a9eK0XoyY33zezqQ0SaM2Q0F8FhGihTQ=; b=a3eh2dCGCkv+YnMYped3WuHAxmsqqZ6acqbaD4439j2zUAtm2vnODcAHrX8HoPdIfJ Q/EPbBa+5EOKTZhdGZaBpujl2TlGJevCLuy7hTLezmiEe/oNbmNNEo1X2t8Ht1x+7cPF oiC09tDZ30KxB2C12SrHzBU73EVLcNdkR0gS/RG1Xbqk473gm7VHaWsHl41/NQdcpCLv xYA11gYvLVCU9ZaK3uCenc59iEa4NNrhQhW/Fwc/VJzKML1/awDh/Lw9/SQ1hr/ALLun rj4QpaKQoF7OJhaqX73NtIIvj9PuSj8X+CHxuv2UKSKN1gJsnucMKgDyR4RxWSxE187h 7JGw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b="fjMj/t/q"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id u9si684036edd.596.2020.12.09.04.03.14; Wed, 09 Dec 2020 04:03:40 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b="fjMj/t/q"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731060AbgLIL6C (ORCPT + 99 others); Wed, 9 Dec 2020 06:58:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730957AbgLIL6A (ORCPT ); Wed, 9 Dec 2020 06:58:00 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2DF3EC0613CF; Wed, 9 Dec 2020 03:57:20 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id 91so1431379wrj.7; Wed, 09 Dec 2020 03:57:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:references:from:autocrypt:subject:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=YvDAWwj69k6a9eK0XoyY33zezqQ0SaM2Q0F8FhGihTQ=; b=fjMj/t/qMSj77PTsV+gj/luqytnACm7XsGx5VFmY9BdWvHMpvbtoA4H7Di9P++Tclm VHlyZz82WIG8UVGKbPgAsnV0BfdBOQBrg/l73o0kxBeki5C8JdrFudTVdbwti5fkc3h2 FemwdGxA4PyWz5hAyeVONdELLFHtVesQxnWvfQOOLTCatD5y4wAhvInWpmk79WcMqfN1 LHIbg1hJ+7/FAqluhe3eMmmrZTZfCMZKix2DnyWLAUxYztIIGKyE9g8bu87Pdg1pJYed +PE0D4jw4hsN3bhG/huRDbzjUeCPTYfge/vEdWHlflmjN2uuAvPMnef2iR7wyN25OTlz O3Bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:references:from:autocrypt:subject :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=YvDAWwj69k6a9eK0XoyY33zezqQ0SaM2Q0F8FhGihTQ=; b=QLZzrk3iZ2p85UcQJ2ATPqQYTFFVzMoLZmxQX8XVeeutd6hWD5vim7+nUefPj/6zsc 1M6hnt4Ayqz9kJVlTqnvP+A618wzE4IU6VoK/6nfexfEWhGAy6nIly4KrTjteRzu0J6n fP9rIVhKGeUZX0ow9O6BPntc4/wP0NZYqTm41NMSqpGa3qsZMhHmwduShNgRwuv9hn5V 7x8ykUi8KdPmgn+uWi80aoNi7e8K3BqHa2cerL7SvDufzJUajDRtfN+Zna+m3DchekZO uLD9QXPtpD3b13vjwE6OGawPR/vAvE1BtykPXZh//IavO7XSvfRFrcjKRWmSe+TgbcnH wDPQ== X-Gm-Message-State: AOAM531iBGMyNHG8LI8WbiT0Kaxb4Ck0M/BLWM+QRGw31uCFf5/5kvF4 BgCXQSGYNJTzka0/INt5Kk4ahAQ5R1bnbQ== X-Received: by 2002:a5d:6682:: with SMTP id l2mr2286262wru.213.1607515038928; Wed, 09 Dec 2020 03:57:18 -0800 (PST) Received: from [192.168.8.121] ([85.255.233.156]) by smtp.gmail.com with ESMTPSA id d8sm2812564wrp.44.2020.12.09.03.57.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Dec 2020 03:57:18 -0800 (PST) To: Christoph Hellwig Cc: Jens Axboe , Alexander Viro , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Wilcox , Ming Lei , Johannes Weiner References: <20201209065040.GA27959@infradead.org> 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: [RFC 0/2] nocopy bvec for direct IO Message-ID: <8521bb81-ce0b-356f-ea75-bb069688715f@gmail.com> Date: Wed, 9 Dec 2020 11:54:01 +0000 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: <20201209065040.GA27959@infradead.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/12/2020 06:50, Christoph Hellwig wrote: > On Wed, Dec 09, 2020 at 02:19:50AM +0000, Pavel Begunkov wrote: >> A benchmark got me 430KIOPS vs 540KIOPS, or +25% on bare metal. And perf >> shows that bio_iov_iter_get_pages() was taking ~20%. The test is pretty >> silly, but still imposing. I'll redo it closer to reality for next >> iteration, anyway need to double check some cases. > > That is pretty impressive. The difference will go down with BS=~1-2 pages, just need to to find a moment to test properly. > But I only got this cover letter, not the > actual patches.. Apologies, that goes for everyone as lost CCs in the patches. -- Pavel Begunkov