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=-7.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 2C6FBC19759 for ; Wed, 7 Aug 2019 06:40:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E60E721E6E for ; Wed, 7 Aug 2019 06:40:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="cZhyddtf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E60E721E6E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8367C6B000A; Wed, 7 Aug 2019 02:40:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7E7366B000C; Wed, 7 Aug 2019 02:40:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6AEE76B000D; Wed, 7 Aug 2019 02:40:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by kanga.kvack.org (Postfix) with ESMTP id 2FB6B6B000A for ; Wed, 7 Aug 2019 02:40:36 -0400 (EDT) Received: by mail-pl1-f200.google.com with SMTP id k9so50114625pls.13 for ; Tue, 06 Aug 2019 23:40:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding:dkim-signature; bh=jn0FnBY7ADCh0laBLX/xGqPiB9Jg8oG9YEaLS2KH1Js=; b=sHYZWkyasq2NjPHs1AtxIJZCcBfBjFCaJBoqh2LxAnQ4Adhf6Qmkvwd5sk93UUuYKU ScbJAuWvYvlpKCTzCDSJtABbrQ4iIqDHLivFiFH/uqmD3lrTkOaeYsScC6pHlkm5jXpI b9UYScwHuO6dKcKXStMMUIPIwHSXjYOAQ5H3XdkKh+pC8gXreqJF2jnsm9yPGHNllGOG m41Nz0XaNpV3dSN3dVwb0qLJv3LmjaHCkZJBcaa/f6eKwmoMkwl/UgnKZ/vmMfaeONdd I5HVFWxAZflGbadyPZrzy/BB9Xt+XQyIGFguUfzHuwaZh9yV7Rml/b+iXKRybZFjNw3K kZRQ== X-Gm-Message-State: APjAAAWCDh1I49YaTCnSewT2zCGMmGUbs1XHwNadybpaRrJzIPeF1qS/ ViTNNfoOk5YkNSOf2mRfPjbvxl7576oUEXdh/uyOl49cpAB3n8TKyPGWV1EIzYZkC5IUWTa+DRh p+z8WKdYt9dlrI0Wqbdajf0pXp5V/3AMqHG7gNtb+3v77y8Y/MXQYDr2lbwSiZwCqsw== X-Received: by 2002:a17:902:8a8a:: with SMTP id p10mr6928616plo.88.1565160035855; Tue, 06 Aug 2019 23:40:35 -0700 (PDT) X-Google-Smtp-Source: APXvYqyfDXgsXudhewG1YKUkLZuwRfmBlhhwDH9E5dMXbswhbx7HdoVTi+NkKc59N7RViQbFJtdX X-Received: by 2002:a17:902:8a8a:: with SMTP id p10mr6928589plo.88.1565160035177; Tue, 06 Aug 2019 23:40:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1565160035; cv=none; d=google.com; s=arc-20160816; b=sccVd7SF+n5PJ2izS65ZVhMPL7UGEHZCiUEkbJYoQ6Bj828Gx22D85zkaOhklZqhtW JSNoGme6tIxrxXp0c1bK8cYQcZDiuEqQbpfuBG2iMSb8g+8MpktKAZ02CHmmb2CV8Y1f Vp7a0J1hYhxip863I/x8vvuF1xk5U+xN+11dUMM6qdhvKIAU8dD7v13qf5DmdTH28K6E fGFsyCkMMMtCILJxpR+ydsiZl5T88iYmfKqI82QBdcKVR5I7x2uJEWxbfzZLKqp0EyKZ 66ulbr3LIo6c4WaiVGU7E/DT6dGE5K0LWYid0KE7BzVBsErgf8y+aGnrRO3x6YjuihD1 VoRA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=dkim-signature:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject; bh=jn0FnBY7ADCh0laBLX/xGqPiB9Jg8oG9YEaLS2KH1Js=; b=V+bHWxY3ZelTO33gMDjK8xMYbg7rBlYTLtw0c6kkC7Mji5XyS+rT3X6TANJfvPKQkY 29sVzTIR9hdYFk+GZGSmNW6kxSyt59d4E+kM5QlDzrrJ/eWbB8UclL0hTu3v+k4Eb6F4 jpCJLYdAvOnMsSiFrAvRz0qHq2N7+Sc3fh/rKpi/u6+YjSf0deHIdgTS3ZzcQjgP5WpT sNzamB9gGM/UoPnoL9NTV3g38dlLfM20fQymH+OHzYxNBdobI2aZCFmX/VKkgeuJU61x HrBm4mV6WgCqrSyvv2x1EJL47P9DhOD8it2pCN/W9F0J8joYZ9Sm5jAekstASKFlsXW3 2V6w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=cZhyddtf; spf=pass (google.com: domain of jhubbard@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: from hqemgate15.nvidia.com (hqemgate15.nvidia.com. [216.228.121.64]) by mx.google.com with ESMTPS id v4si43109863plp.212.2019.08.06.23.40.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Aug 2019 23:40:35 -0700 (PDT) Received-SPF: pass (google.com: domain of jhubbard@nvidia.com designates 216.228.121.64 as permitted sender) client-ip=216.228.121.64; Authentication-Results: mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=cZhyddtf; spf=pass (google.com: domain of jhubbard@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 06 Aug 2019 23:40:44 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 06 Aug 2019 23:40:34 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 06 Aug 2019 23:40:34 -0700 Received: from [10.2.165.207] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 7 Aug 2019 06:40:34 +0000 Subject: Re: [PATCH 00/12] block/bio, fs: convert put_page() to put_user_page*() To: Christoph Hellwig CC: , Andrew Morton , Alexander Viro , Anna Schumaker , "David S . Miller" , Dominique Martinet , Eric Van Hensbergen , Jason Gunthorpe , Jason Wang , Jens Axboe , Latchesar Ionkov , "Michael S . Tsirkin" , Miklos Szeredi , Trond Myklebust , Christoph Hellwig , Matthew Wilcox , , LKML , , , , , , , , , , , References: <20190724042518.14363-1-jhubbard@nvidia.com> <20190724061750.GA19397@infradead.org> <20190807063448.GA6002@infradead.org> X-Nvconfidentiality: public From: John Hubbard Message-ID: <3ab1e69f-88c6-3e16-444d-cab78c3bf1d1@nvidia.com> Date: Tue, 6 Aug 2019 23:38:59 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190807063448.GA6002@infradead.org> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL104.nvidia.com (172.18.146.11) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1565160044; bh=jn0FnBY7ADCh0laBLX/xGqPiB9Jg8oG9YEaLS2KH1Js=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=cZhyddtfeWnuDzmY91G/o97CceVB5RM0qm7xIS+BT+DJS1yACOaMbPnxtDPonJo3O Ckk802AdQClg27dtVTwqZlP1rJ45uR/xJxU2tj1bAWtx6wGx8MnDwDr9/hAcMofdtY YSzbF7dvdBOxPO1CMgg0kHDyQnZ9XI/sZkIaiXVixuZIn5BzSqRh7aOyfPS3OIiva2 EdoAoTR8kqTmNnuIpmqz0Mts9lp7nFil4TrfQHcFTrur14aYk9UOgpcZdRREzoyCup 0KYEKb/ZJNSFduxPI76a4ilG78VxY7/mJHog1LdnWqMnq4OYf6DhFN3qt02E1MzswR TFH77+TyL//6w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/6/19 11:34 PM, Christoph Hellwig wrote: > On Mon, Aug 05, 2019 at 03:54:35PM -0700, John Hubbard wrote: >> On 7/23/19 11:17 PM, Christoph Hellwig wrote: ... >>> I think we can do this in a simple and better way. We have 5 ITER_* >>> types. Of those ITER_DISCARD as the name suggests never uses pages, so >>> we can skip handling it. ITER_PIPE is rejected =D1=96n the direct I/O = path, >>> which leaves us with three. >>> >> >> Hi Christoph, >> >> Are you working on anything like this? >=20 > I was hoping I could steer you towards it. But if you don't want to do > it yourself I'll add it to my ever growing todo list. >=20 Sure, I'm up for this. The bvec-related items are the next logical part of the gup/dma conversions to work on, and I just wanted to avoid solving t= he same problem if you were already in the code. >> Or on the put_user_bvec() idea? >=20 > I have a prototype from two month ago: >=20 > http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/gup-bvec >=20 > but that only survived the most basic testing, so it'll need more work, > which I'm not sure when I'll find time for. >=20 I'll take a peek, and probably pester you with a few questions if I get confused. :) thanks, --=20 John Hubbard NVIDIA