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=-0.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 77328C35250 for ; Fri, 7 Feb 2020 20:42:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5087520838 for ; Fri, 7 Feb 2020 20:42:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Tw6wTJ0K" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727341AbgBGUmF (ORCPT ); Fri, 7 Feb 2020 15:42:05 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:37110 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726947AbgBGUmF (ORCPT ); Fri, 7 Feb 2020 15:42:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Transfer-Encoding :Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=hC4I5nJwx7uto4FIN8Dk9Z+Eyug283kzyKTXci+gNBs=; b=Tw6wTJ0KsV0PA0kwHG0T+3GxJm WWRdxxjvyRklhUCQmYltYLKnmSGeqcw1JILVQ/pe+fHuBfsCOg/Hvwkhd0LB8Hj++M1606r8ltQgz 4chq38ObnDTsiIst+PWX3UdXaWAtwYGIzHVB4Ixu8sXUvtjJeYPouhSC0dNLvozInAU0P9a0dK+o0 0lRNpmR3vEHY5svMECArN0tnwk7Zdo+/4FjE2/E6Ot7QaA91vwDaRUl7aNCw6xYSuyWtZfruswHWl sN9fr8yGRYzm6+fHnREuFLLa4VcH9bbgC33EKWeA25QsSS177P3XWWdawSwjjFSVAbZapYHqPZfQl 7x305BrA==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j0ARu-0001cQ-03; Fri, 07 Feb 2020 20:42:02 +0000 Date: Fri, 7 Feb 2020 12:42:01 -0800 From: Matthew Wilcox To: Jason Gunthorpe Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, Christian =?iso-8859-1?Q?K=F6nig?= , Daniel Vetter , Logan Gunthorpe , Stephen Bates , =?iso-8859-1?B?Suly9G1l?= Glisse , Ira Weiny , Christoph Hellwig , John Hubbard , Ralph Campbell , Dan Williams , Don Dutile , Thomas =?iso-8859-1?Q?Hellstr=F6m_=28VMware=29?= , Joao Martins Subject: Re: [LSF/MM TOPIC] get_user_pages() for PCI BAR Memory Message-ID: <20200207204201.GH8731@bombadil.infradead.org> References: <20200207182457.GM23346@mellanox.com> <20200207194620.GG8731@bombadil.infradead.org> <20200207201351.GN23346@mellanox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200207201351.GN23346@mellanox.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Fri, Feb 07, 2020 at 04:13:51PM -0400, Jason Gunthorpe wrote: > On Fri, Feb 07, 2020 at 11:46:20AM -0800, Matthew Wilcox wrote: > > > > > > Christian König > > > Daniel Vetter > > > Logan Gunthorpe > > > Stephen Bates > > > Jérôme Glisse > > > Ira Weiny > > > Christoph Hellwig > > > John Hubbard > > > Ralph Campbell > > > Dan Williams > > > Don Dutile > > > > That's a long list, and you're missing > > > > "Thomas Hellström (VMware)" > > Joao Martins > > Great, thanks, I'm not really aware of what the related work is > though? Thomas has been working on huge pages for graphics BARs, so that's involved touching 'special' (ie pageless) VMAs: https://lore.kernel.org/linux-mm/20200205125353.2760-1-thomas_os@shipmail.org/ Joao has been working on removing the need for KVM hosts to have struct pages that cover the memory of their guests: https://lore.kernel.org/linux-mm/20200110190313.17144-1-joao.m.martins@oracle.com/ > > both of whom have been working on related projects (for PFNs without pages). > > Hey, you missed me too! ;-) > > Ah I was not daring to propose a discussion on 'PFNs without pages' > again :) > > The early exploratory work here has been creating ZONE_DEVICE pages as > is already done for P2P and now moving to also mmap them to userspace. Dynamically allocating struct pages interests me too ;-)