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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 CFB34C17449 for ; Tue, 12 Nov 2019 20:38:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A40F7206A3 for ; Tue, 12 Nov 2019 20:38:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="j3NNIjPO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727100AbfKLUiG (ORCPT ); Tue, 12 Nov 2019 15:38:06 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:34207 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726659AbfKLUiG (ORCPT ); Tue, 12 Nov 2019 15:38:06 -0500 Received: by mail-qk1-f196.google.com with SMTP id 205so15760989qkk.1 for ; Tue, 12 Nov 2019 12:38:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=j3NNIjPO3cADqvZd/hJQbIxM+DDhVRAEGcC+3T6+Q3fhxmcfREpCirlLaEIJBZkEdd e3aBqytbSt/O1y6azCg5mzciQb9aXN7nl404GgQzXcRXFb+31Gp+DUUM20vq+CBmnlhO OI6Itn853T6kP0jxgCe/92EYcvYqEI5wpO6FG/uJe2R9DweqI3FnTjwOvYkLmRQ3s4Xc zG96fPghzfwVyKWk9G5BMiBAMZoSIJhIZiNOrjmRw2PjfIwZlx+LuvDRDWa51OzyNGdk 7PnZkzKlvewWQFyt2QF7slB5Swx6CEiwuOCbZxYFCsytkVXhCWtpdK2fshpP/jsmV8fx ZjTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=Pieset3qTgrlQfddIT4pgKSQcz0iPrslvfPXXUkeCGTvNHG3Ck3EZjK7LvmyOHyIpR s6E+sYbYLBpdf+XtsdcGCYrO1ZsUoOHum9N45YJbh4VMP5WYcac50jteWN99QYwT3m/T 21QuhJclw6Lqsjyo5x4qfvxUY+eA1LQcPib2gDGgDEn9FQv39rR/jsc1oQQocKGYrbZh i8Q1VWN/f5T03audGAFLZnddS+YzuQZAaFJxvclbdJDVG1RpBPHLKKINOi7ls3+glDfk 7liMo9LgFOlL/G7ebT6AGp5W69Sn35jp6B819AX7vTwMlQ+MzR4gzqdSL5AJKjbsNQZ5 bQ4w== X-Gm-Message-State: APjAAAUWlYyzMoKHuiHoxMziUoR22bhnyrEDJkWjz/mMUwfBSwz74Vd3 TlCxnfwlpHH5KY3yXAHt3rGipA== X-Google-Smtp-Source: APXvYqwLkTug1hfsKRZbiUckKPR5+bmE3pOvHeIup8u/vHZbKyWy6tiIbngDLXx22jZap3IUKn0tSg== X-Received: by 2002:a37:dc44:: with SMTP id v65mr7289252qki.72.1573591083419; Tue, 12 Nov 2019 12:38:03 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.180]) by smtp.gmail.com with ESMTPSA id k40sm11983680qta.76.2019.11.12.12.38.02 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Nov 2019 12:38:02 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iUcvK-00043t-G4; Tue, 12 Nov 2019 16:38:02 -0400 Date: Tue, 12 Nov 2019 16:38:02 -0400 From: Jason Gunthorpe To: John Hubbard Cc: Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jens Axboe , Jonathan Corbet , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , bpf@vger.kernel.org, dri-devel@lists.freedesktop.org, kvm@vger.kernel.org, linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, linux-rdma@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-mm@kvack.org, LKML Subject: Re: [PATCH v3 00/23] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM Message-ID: <20191112203802.GD5584@ziepe.ca> References: <20191112000700.3455038-1-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191112000700.3455038-1-jhubbard@nvidia.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Mon, Nov 11, 2019 at 04:06:37PM -0800, John Hubbard wrote: > Hi, > > The cover letter is long, so the more important stuff is first: > > * Jason, if you or someone could look at the the VFIO cleanup (patch 8) > and conversion to FOLL_PIN (patch 18), to make sure it's use of > remote and longterm gup matches what we discussed during the review > of v2, I'd appreciate it. > > * Also for Jason and IB: as noted below, in patch 11, I am (too?) boldly > converting from put_user_pages() to release_pages(). Why are we doing this? I think things got confused here someplace, as the comment still says: /** * put_user_page() - release a gup-pinned page * @page: pointer to page to be released * * Pages that were pinned via get_user_pages*() must be released via * either put_user_page(), or one of the put_user_pages*() routines * below. I feel like if put_user_pages() is not the correct way to undo get_user_pages() then it needs to be deleted. Jason 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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 BDB68C43331 for ; Tue, 12 Nov 2019 20:40:07 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2B70A206A3 for ; Tue, 12 Nov 2019 20:40:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="j3NNIjPO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B70A206A3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47CKPJ2pnfzF4jS for ; Wed, 13 Nov 2019 07:40:04 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ziepe.ca (client-ip=2607:f8b0:4864:20::743; helo=mail-qk1-x743.google.com; envelope-from=jgg@ziepe.ca; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ziepe.ca header.i=@ziepe.ca header.b="j3NNIjPO"; dkim-atps=neutral Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 47CKM33QFDzF1Q6 for ; Wed, 13 Nov 2019 07:38:06 +1100 (AEDT) Received: by mail-qk1-x743.google.com with SMTP id d13so15740370qko.3 for ; Tue, 12 Nov 2019 12:38:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=j3NNIjPO3cADqvZd/hJQbIxM+DDhVRAEGcC+3T6+Q3fhxmcfREpCirlLaEIJBZkEdd e3aBqytbSt/O1y6azCg5mzciQb9aXN7nl404GgQzXcRXFb+31Gp+DUUM20vq+CBmnlhO OI6Itn853T6kP0jxgCe/92EYcvYqEI5wpO6FG/uJe2R9DweqI3FnTjwOvYkLmRQ3s4Xc zG96fPghzfwVyKWk9G5BMiBAMZoSIJhIZiNOrjmRw2PjfIwZlx+LuvDRDWa51OzyNGdk 7PnZkzKlvewWQFyt2QF7slB5Swx6CEiwuOCbZxYFCsytkVXhCWtpdK2fshpP/jsmV8fx ZjTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=XiY/79aUiLI+/69gTL6MRf0NpI4+fGh6DGNHuPZgnepcj52m9mxH8jH+jMARUN1X3+ 5wxR+BQM8IAv4hEtko/hTVKhCPdRVlkEabqIgh9kGlmYOs543LMCfnmpTuilgaWLwvpw ehrs54y88D0bX+iuJd1Skn/UqnLYSE1OmZ1gpIErIHaY9cdxjqwQezyPzJYBCIt1juOl M9Kwy3Tgp0r7riXjB/mT7daEHIymF32MfvxcRYjo2bK8f7TzXR4xNuu7bzoYrRbH9cuO 0MicHZ0swY98KUEmvgWgKGdTXiLPMfwnmzhFehXyiMsw77sI7wL1wcL4f3jiSVqdCZzC WPeg== X-Gm-Message-State: APjAAAV43vHGKkxPyiOSRU1DWM2QmnyFSLnjz8i9Wl+ZXzzMXr0Mcdfm SHMKOBHo+U7ppIb3/gj/5Yn1/w== X-Google-Smtp-Source: APXvYqwLkTug1hfsKRZbiUckKPR5+bmE3pOvHeIup8u/vHZbKyWy6tiIbngDLXx22jZap3IUKn0tSg== X-Received: by 2002:a37:dc44:: with SMTP id v65mr7289252qki.72.1573591083419; Tue, 12 Nov 2019 12:38:03 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.180]) by smtp.gmail.com with ESMTPSA id k40sm11983680qta.76.2019.11.12.12.38.02 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Nov 2019 12:38:02 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iUcvK-00043t-G4; Tue, 12 Nov 2019 16:38:02 -0400 Date: Tue, 12 Nov 2019 16:38:02 -0400 From: Jason Gunthorpe To: John Hubbard Subject: Re: [PATCH v3 00/23] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM Message-ID: <20191112203802.GD5584@ziepe.ca> References: <20191112000700.3455038-1-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191112000700.3455038-1-jhubbard@nvidia.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Christoph Hellwig , Vlastimil Babka , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , linux-media@vger.kernel.org, Shuah Khan , linux-block@vger.kernel.org, =?utf-8?B?SsOpcsO0bWU=?= Glisse , Al Viro , Dan Williams , Mauro Carvalho Chehab , bpf@vger.kernel.org, Magnus Karlsson , Jens Axboe , netdev@vger.kernel.org, Alex Williamson , Daniel Vetter , linux-fsdevel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Nov 11, 2019 at 04:06:37PM -0800, John Hubbard wrote: > Hi, > > The cover letter is long, so the more important stuff is first: > > * Jason, if you or someone could look at the the VFIO cleanup (patch 8) > and conversion to FOLL_PIN (patch 18), to make sure it's use of > remote and longterm gup matches what we discussed during the review > of v2, I'd appreciate it. > > * Also for Jason and IB: as noted below, in patch 11, I am (too?) boldly > converting from put_user_pages() to release_pages(). Why are we doing this? I think things got confused here someplace, as the comment still says: /** * put_user_page() - release a gup-pinned page * @page: pointer to page to be released * * Pages that were pinned via get_user_pages*() must be released via * either put_user_page(), or one of the put_user_pages*() routines * below. I feel like if put_user_pages() is not the correct way to undo get_user_pages() then it needs to be deleted. Jason From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH v3 00/23] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM Date: Tue, 12 Nov 2019 16:38:02 -0400 Message-ID: <20191112203802.GD5584@ziepe.ca> References: <20191112000700.3455038-1-jhubbard@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20191112000700.3455038-1-jhubbard@nvidia.com> Sender: netdev-owner@vger.kernel.org To: John Hubbard Cc: Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jens Axboe , Jonathan Corbet , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman List-Id: dri-devel@lists.freedesktop.org On Mon, Nov 11, 2019 at 04:06:37PM -0800, John Hubbard wrote: > Hi, > > The cover letter is long, so the more important stuff is first: > > * Jason, if you or someone could look at the the VFIO cleanup (patch 8) > and conversion to FOLL_PIN (patch 18), to make sure it's use of > remote and longterm gup matches what we discussed during the review > of v2, I'd appreciate it. > > * Also for Jason and IB: as noted below, in patch 11, I am (too?) boldly > converting from put_user_pages() to release_pages(). Why are we doing this? I think things got confused here someplace, as the comment still says: /** * put_user_page() - release a gup-pinned page * @page: pointer to page to be released * * Pages that were pinned via get_user_pages*() must be released via * either put_user_page(), or one of the put_user_pages*() routines * below. I feel like if put_user_pages() is not the correct way to undo get_user_pages() then it needs to be deleted. Jason 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 C7B7FC43331 for ; Wed, 13 Nov 2019 07:56:40 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A9ADB222C1 for ; Wed, 13 Nov 2019 07:56:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A9ADB222C1 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5EB536EC35; Wed, 13 Nov 2019 07:56:19 +0000 (UTC) Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by gabe.freedesktop.org (Postfix) with ESMTPS id 531396E51C for ; Tue, 12 Nov 2019 20:38:04 +0000 (UTC) Received: by mail-qk1-x743.google.com with SMTP id 15so15731800qkh.6 for ; Tue, 12 Nov 2019 12:38:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=GMi4xT2UOd2CFR3VJjVGTgOG1WxBYR/HDNQyyBU/zGM=; b=Sg59OgbRodRVgrywohXvY0Muu8Rx2qc6MyHxkF8q9IOovJ5gnAXMrRB1qppqNnSSEp oyQIDnXjegS0/bM1RER1BBtckyOHovzv4Oqz9yU2Tzvms7Z8jPBf+z3vkhah/shF/5kp /ucpBoZ76+FyfjcK4TavD1WWGou3GaCtRgtv8PdQevBpOnYl6PMKDyoaBheWwdukmym/ FMzdsyVraLqV+46J8glQxyvNd1dvNzQbsf46ZiSJ8Mn6fMsgIXWEVvJSBBMQIYdirMA3 5vRzDtBAwC42Hg7F1OCZE9aDVPQWQBHqs1tfkgZ4m3gF2jt3BaBMVIX2fOye3PDNZkAN yn8w== X-Gm-Message-State: APjAAAViMgUod6CB/ice2W7qi1B77ObKk6edElwJEq3dHWmqs4HedIfV 6Qk6bKzBTZs6Q4dKpCA5nWa0TQ== X-Google-Smtp-Source: APXvYqwLkTug1hfsKRZbiUckKPR5+bmE3pOvHeIup8u/vHZbKyWy6tiIbngDLXx22jZap3IUKn0tSg== X-Received: by 2002:a37:dc44:: with SMTP id v65mr7289252qki.72.1573591083419; Tue, 12 Nov 2019 12:38:03 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. 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