Received: by 2002:a05:6a10:9848:0:0:0:0 with SMTP id x8csp715461pxf; Thu, 1 Apr 2021 11:36:35 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxZEO5MM2/yRrcfzmjU1xucOdda/1Nf334b07csxIaLB7ufVVCQHXlc/FDRovOe+TDH8niv X-Received: by 2002:a92:cd4a:: with SMTP id v10mr7752591ilq.273.1617302194988; Thu, 01 Apr 2021 11:36:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1617302194; cv=none; d=google.com; s=arc-20160816; b=IA2LGludWEFA0xfrUBLv9jBCO+NLCFy1Bho0Fq5f3p46vWdgV9bETGX+JGu1XjuhwY PRYngLyumphivNg+HAudll81p+Ec8GclphztXdfgwkQX/V9DjFViUUGzQfgx3JRGkC1M h6d8box22DqAOgqAp4+xCfvs7rk9uvak6ZitLbHe+/4h2cdqOHq2MDP7KdLSWdPiD5rF 12rDYYVXVWMFWrxmvlJBDiMuUZQfkW3CcSBJCXBMqcZ8WKeHNz9sUry7yumBP1BJrG3L yzIE+NGtFcPNuowfiOY3XQwEUWojxspgxkfyaLWCw3CuQDpSxBOygntpSzp3HyLtF4dG +AGw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=vwT6t1XvIjaj4QuAa3P4UOmWUFIFgnQBx4zLk2dwX9Q=; b=rSPYFq5WOJp3y5BS7NyccOGrivq8IV/QEIloDSoyRXnEaryJtEEoB/6Ts8wAoDdLgk cXKaBX/5Dn5eel5avHq0uMWUVU8ovm+J43kOKNygDkUXebXm7BKoDyZgk3ov5nVIuHTi 6Awq+yim/2ANvrOfDimLhczfzbk8Ycn/sB/xpGHchaGzubCKjb3NWmqC/TjXLBWzhTRH 1XzflUmtrhPdNzCO5LHyZXHm2bNBmakKtDPLCKn81q5zrfxBwam6vDih+DqOYlanduzd GW22MLTYYx2gZBrqhjaf+2oAFo6ibaELxxx8xweEN90qGwG8khRdvKvz+pjiZZhohQtk 6bVQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b="tG/03x14"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id d21si5376543iof.9.2021.04.01.11.36.21; Thu, 01 Apr 2021 11:36:34 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b="tG/03x14"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238598AbhDASew (ORCPT + 99 others); Thu, 1 Apr 2021 14:34:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36920 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238539AbhDASOp (ORCPT ); Thu, 1 Apr 2021 14:14:45 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 154E4C0617AA; Thu, 1 Apr 2021 04:27:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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; bh=vwT6t1XvIjaj4QuAa3P4UOmWUFIFgnQBx4zLk2dwX9Q=; b=tG/03x14U8fbdXage3fW66lH1Z 1G0mXooyTO3KydM/F+4rMb04dSOqZVGhkjpeJtXZAGlsadb5YzqJGHJpeTbtlRlCkxpUN3MQVZVEI leehL8npa4veAd5L9meSprBxQ3kZnbFXpgBgp5cglolIe71eSxiGzEhSaWk+4UudJDi3NvlYXFtAD rwmdCcG8VXQnvAd6fsVV+hkQLY9m0N+hb3KrIIQsFmXvEib5ZsAR5ZrIhRlL5JnGsFQ2dblObvj0G HsSc4WOyPXM2wEqm2cLWzMlXPkSTwYf+CcVRVa2S+24Gg/VXb3Cf3fYQMd3IYzkoQEx5+7+6+3DNg 5NQNjpPA==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lRvTU-0063dK-Sb; Thu, 01 Apr 2021 11:26:57 +0000 Date: Thu, 1 Apr 2021 12:26:56 +0100 From: Matthew Wilcox To: Christoph Hellwig Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, linux-afs@lists.infradead.org Subject: Re: [PATCH v6 00/27] Memory Folios Message-ID: <20210401112656.GA351017@casper.infradead.org> References: <20210331184728.1188084-1-willy@infradead.org> <20210401070537.GB1363493@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210401070537.GB1363493@infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 01, 2021 at 08:05:37AM +0100, Christoph Hellwig wrote: > On Wed, Mar 31, 2021 at 07:47:01PM +0100, Matthew Wilcox (Oracle) wrote: > > - Mirror members of struct page (for pagecache / anon) into struct folio, > > so (eg) you can use folio->mapping instead of folio->page.mapping > > Eww, why? So that eventually we can rename page->mapping to page->_mapping and prevent the bugs from people doing page->mapping on a tail page. eg https://lore.kernel.org/linux-mm/alpine.LSU.2.11.2103102214170.7159@eggly.anvils/