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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable 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 32A39C10F04 for ; Thu, 14 Feb 2019 20:08:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB27E21B68 for ; Thu, 14 Feb 2019 20:08:48 +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="jzgMym79" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405970AbfBNUIn (ORCPT ); Thu, 14 Feb 2019 15:08:43 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:52954 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391810AbfBNUIn (ORCPT ); Thu, 14 Feb 2019 15:08:43 -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-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=3mwfpa8LNR+UOVANIfUHZaTtq+bD3XmZiQXOhtKUaYM=; b=jzgMym798e+z4CWQ3ts9zTomB uHV6QS0qAtJeDzNsTejixTR+SDHlduKxrcqrHiXyAO2Q/ULK7UvQwR0jVicPyjzPFUnrHrKHJ7GXk EJfHHxWsdgxwI+voRvnm8h5vfk5qogPwExo9oipC2mmm3rsej2CB1GGR8KvJrsrU0SdEb559cn5Bu pFnlYyCYXVb0fl62gI3kW4iM9QNtVjdf+WfL0PwrFNel4DubKhOirZQwfNhBGjK1DEuWCSaX3gYWh eW+lUsRanX1U/dg99zxiecdw7y81b8n3GSys5wIV68R9Uchj6/YzPUN7gGaLLIkL8H67YI6FQNDbV OVoaejwvg==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1guNJI-0005oe-Vl; Thu, 14 Feb 2019 20:08:40 +0000 Date: Thu, 14 Feb 2019 12:08:40 -0800 From: Matthew Wilcox To: Dan Williams Cc: Jerome Glisse , Michal Hocko , lsf-pc@lists.linux-foundation.org, linux-xfs , linux-fsdevel , linux-ext4 , Linux Kernel Mailing List , linux-nvdimm Subject: Re: [Lsf-pc] [LSF/MM TOPIC] The end of the DAX experiment Message-ID: <20190214200840.GB12668@bombadil.infradead.org> References: <20190214134622.GG4525@dhcp22.suse.cz> <20190214191013.GA3420@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Thu, Feb 14, 2019 at 11:31:24AM -0800, Dan Williams wrote: > On Thu, Feb 14, 2019 at 11:10 AM Jerome Glisse wrote: > > I am just again working on my struct page mapping patchset as well as > > the generic page write protection that sits on top. I hope to be able > > to post the v2 in couple weeks. You can always look at my posting last > > year to see more details. > > Yes, I have that in mind as one of the contenders. However, it's not > clear to me that its a suitable fit for filesystem-reflink. Others > have floated the 'page proxy' idea, so it would be good to discuss the > merits of the general approaches. ... and my preferred option of putting pfn entries in the page cache. Or is that what you meant by "page proxy"?