Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932403AbbELLNe (ORCPT ); Tue, 12 May 2015 07:13:34 -0400 Received: from mail-lb0-f178.google.com ([209.85.217.178]:34639 "EHLO mail-lb0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932192AbbELLNc (ORCPT ); Tue, 12 May 2015 07:13:32 -0400 MIME-Version: 1.0 In-Reply-To: <20150512090156.24768.2521.stgit@buzz> References: <20150512090156.24768.2521.stgit@buzz> Date: Tue, 12 May 2015 12:13:30 +0100 Message-ID: Subject: Re: [PATCH RFC 0/3] pagemap: make useable for non-privilege users From: Mark Williamson To: Konstantin Khlebnikov Cc: linux-mm@kvack.org, Naoya Horiguchi , kernel list , Andrew Morton , Pavel Emelyanov , Linux API , Andy Lutomirski , Vlastimil Babka , Pavel Machek , Mark Seaborn , "Kirill A. Shutemov" , Linus Torvalds , Daniel James , Finn Grimwood Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1678 Lines: 41 Hi Konstantin, Thanks very much for continuing to look at this! It's very much appreciated. I've been investigating from our end but got caught up in some gnarly details of our pagemap-consuming code. I like the approach and it seems like the information you're exposing will be useful for our application. I'll test the patch and see if it works for us as-is. Will follow up with any comments on the individual patches. Thanks, Mark On Tue, May 12, 2015 at 10:43 AM, Konstantin Khlebnikov wrote: > This patchset tries to make pagemap useable again in the safe way. > First patch adds bit 'map-exlusive' which is set if page is mapped only here. > Second patch restores access for non-privileged users but hides pfn if task > has no capability CAP_SYS_ADMIN. Third patch removes page-shift bits and > completes migration to the new pagemap format (flags soft-dirty and > mmap-exlusive are available only in the new format). > > --- > > Konstantin Khlebnikov (3): > pagemap: add mmap-exclusive bit for marking pages mapped only here > pagemap: hide physical addresses from non-privileged users > pagemap: switch to the new format and do some cleanup > > > Documentation/vm/pagemap.txt | 3 - > fs/proc/task_mmu.c | 178 +++++++++++++++++------------------------- > tools/vm/page-types.c | 35 ++++---- > 3 files changed, 91 insertions(+), 125 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/