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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 76C11C433B4 for ; Thu, 1 Apr 2021 11:27:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 157416108F for ; Thu, 1 Apr 2021 11:27:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 157416108F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 58D066B0082; Thu, 1 Apr 2021 07:27:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 53CDE6B0083; Thu, 1 Apr 2021 07:27:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4047C6B0085; Thu, 1 Apr 2021 07:27:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0240.hostedemail.com [216.40.44.240]) by kanga.kvack.org (Postfix) with ESMTP id 23F476B0082 for ; Thu, 1 Apr 2021 07:27:09 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D6FB68249980 for ; Thu, 1 Apr 2021 11:27:08 +0000 (UTC) X-FDA: 77983571736.09.2F331DF Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id AE46640002CF for ; Thu, 1 Apr 2021 11:27:06 +0000 (UTC) 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> X-Stat-Signature: hetumnmj4c8rmz3zau93acyus6moet1i X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: AE46640002CF Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617276426-687165 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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/