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=-9.9 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1,USER_IN_DEF_DKIM_WL 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 676EFCA9ED4 for ; Mon, 4 Nov 2019 20:33:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3EAFC2089C for ; Mon, 4 Nov 2019 20:33:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="OY0XB+pn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729563AbfKDUdM (ORCPT ); Mon, 4 Nov 2019 15:33:12 -0500 Received: from mail-pf1-f194.google.com ([209.85.210.194]:33388 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728519AbfKDUdM (ORCPT ); Mon, 4 Nov 2019 15:33:12 -0500 Received: by mail-pf1-f194.google.com with SMTP id c184so13237190pfb.0 for ; Mon, 04 Nov 2019 12:33:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:in-reply-to:message-id:references :user-agent:mime-version; bh=DnK/FIUjtfMpvgjhYJHwDVVqbAfzXMvLjaoAfA8yVt8=; b=OY0XB+pnC7EUpHSQ8yqmSdGzuM19l1QV2njz4lt2384NL+vVsTzKuslwpXHwsk0N+I dZMVtGQNTBtLEVBnR8gAD9XNgACmQrzJC68sh448rTQlDayrJqeB0M445s6/jf3cT6Pb NZZ+pL+6f4BBHH/B3nMcaAYKUkl2AQQnq6f98/RCiuh6DgUl+/f96fWCFaFlkmskNChx MZ/7akyfS7PP1xF/9bTh/55R2+Y5DT5rWJm7Cv0RUqBYhuwjKxViCvgW0uYk/xg33Sc/ xfRMVnNsQczWqMvmGtgK05lodct1STvVjmeasrhxMRgmb3Ko1i8IBBDPrpRAfsUyE3+k eHpg== 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:in-reply-to:message-id :references:user-agent:mime-version; bh=DnK/FIUjtfMpvgjhYJHwDVVqbAfzXMvLjaoAfA8yVt8=; b=EiFeRpKfS64gjoN6uD2U2RMriDMoG9Cxy/ia5rlNiAwu11ISPqMXsTr4fcuLrqwbIu HQD2XdiKvFUsjtDheW1aZ9c5gKFRhCOjzrmtOOSL6tLdHCJfhXUn0CeIpYIUkD63R3WM 88evNyMx7H2rsrKYVkVxEvTgjIW49m59k5C8dHCo1DY5bnaSCceZm9UV1HoCHHRyfZxt 3Y2QEUs+Iy3vGenHdhG7H2FK7l3FgzXWOEMbSbkN/uDv9+PO1crOMB1Xr2N/lILqoxTI 7tJeccIFeh1ZJQ9g2dtLn2NUuVWxFE+0SBP+4LukO/CU3w71ncCJ8DKxRzmCtRNWQ879 Cz8w== X-Gm-Message-State: APjAAAVKWTRjSSPokOBIGn1vFnPLet/8Mtd4zibmSWwoO6z6Lq2BQM7X pjNgvnGO1p9HtAgIItThd9JxNg== X-Google-Smtp-Source: APXvYqyhviRnVEE8HSNsRv5kFXmlmiRaKK/VWcjGWZKAhJfF3CiA7Y5Kptgh8pnqs8cZ8TjFJYIjHQ== X-Received: by 2002:a17:90a:9406:: with SMTP id r6mr1471858pjo.0.1572899590774; Mon, 04 Nov 2019 12:33:10 -0800 (PST) Received: from [2620:15c:17:3:3a5:23a7:5e32:4598] ([2620:15c:17:3:3a5:23a7:5e32:4598]) by smtp.gmail.com with ESMTPSA id e17sm18228455pfh.121.2019.11.04.12.33.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Nov 2019 12:33:10 -0800 (PST) Date: Mon, 4 Nov 2019 12:33:09 -0800 (PST) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: John Hubbard cc: Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?UTF-8?Q?Bj=C3=B6rn_T=C3=B6pel?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jason Gunthorpe , Jens Axboe , Jonathan Corbet , =?UTF-8?Q?J=C3=A9r=C3=B4me_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 v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL_PIN In-Reply-To: <20191103211813.213227-6-jhubbard@nvidia.com> Message-ID: References: <20191103211813.213227-1-jhubbard@nvidia.com> <20191103211813.213227-6-jhubbard@nvidia.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Sun, 3 Nov 2019, John Hubbard wrote: > Introduce pin_user_pages*() variations of get_user_pages*() calls, > and also pin_longterm_pages*() variations. > > These variants all set FOLL_PIN, which is also introduced, and > thoroughly documented. > > The pin_longterm*() variants also set FOLL_LONGTERM, in addition > to FOLL_PIN: > > pin_user_pages() > pin_user_pages_remote() > pin_user_pages_fast() > > pin_longterm_pages() > pin_longterm_pages_remote() > pin_longterm_pages_fast() > > All pages that are pinned via the above calls, must be unpinned via > put_user_page(). > Hi John, I'm curious what consideration is given to what pageblock migrate types that FOLL_PIN and FOLL_LONGTERM pages originate from, assuming that longterm would want to originate from MIGRATE_UNMOVABLE pageblocks for the purposes of anti-fragmentation?