From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f198.google.com (mail-wr0-f198.google.com [209.85.128.198]) by kanga.kvack.org (Postfix) with ESMTP id 68A016B0003 for ; Wed, 31 Jan 2018 12:09:54 -0500 (EST) Received: by mail-wr0-f198.google.com with SMTP id h38so11151349wrh.11 for ; Wed, 31 Jan 2018 09:09:54 -0800 (PST) Received: from huawei.com (lhrrgout.huawei.com. [194.213.3.17]) by mx.google.com with ESMTPS id v37si1824600edm.114.2018.01.31.09.09.53 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 31 Jan 2018 09:09:53 -0800 (PST) Subject: Re: [LSF/MM TOPIC] Killing reliance on struct page->mapping References: <20180130004347.GD4526@redhat.com> From: Igor Stoppa Message-ID: <111f49c1-02d1-3355-e403-a8f91c0191e2@huawei.com> Date: Wed, 31 Jan 2018 19:09:48 +0200 MIME-Version: 1.0 In-Reply-To: <20180130004347.GD4526@redhat.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Jerome Glisse , lsf-pc@lists.linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org On 30/01/18 02:43, Jerome Glisse wrote: [...] > Maybe we can kill page->mapping altogether as a result of this. However this is > not my motivation at this time. We had a discussion some time ago http://www.openwall.com/lists/kernel-hardening/2017/07/07/7 where you advised to use it for tracking pmalloc pages vs area, which generated this patch: http://www.openwall.com/lists/kernel-hardening/2018/01/24/7 Could you please comment what wold happen to the shortcut from struct page to vm_struct that this patch is now introducing? -- thanks, igor -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org