Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756755AbbHFUpi (ORCPT ); Thu, 6 Aug 2015 16:45:38 -0400 Received: from resqmta-ch2-03v.sys.comcast.net ([69.252.207.35]:52508 "EHLO resqmta-ch2-03v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756147AbbHFUpe (ORCPT ); Thu, 6 Aug 2015 16:45:34 -0400 Date: Thu, 6 Aug 2015 15:45:31 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@east.gentwo.org To: Hugh Dickins cc: "Kirill A. Shutemov" , "Kirill A. Shutemov" , Andrew Morton , Andrea Arcangeli , David Rientjes , Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: page-flags behavior on compound pages: a worry In-Reply-To: Message-ID: References: <1426784902-125149-1-git-send-email-kirill.shutemov@linux.intel.com> <1426784902-125149-5-git-send-email-kirill.shutemov@linux.intel.com> <20150806153259.GA2834@node.dhcp.inet.fi> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 710 Lines: 17 On Thu, 6 Aug 2015, Hugh Dickins wrote: > > I know a patchset which solves this! ;) > > Oh, and I know a patchset which avoids these problems completely, > by not using compound pages at all ;) Another dumb idea: Stop the insanity of splitting pages on the fly? Splitting pages should work like page migration: Lock everything down and ensure no one is using the page and then do it. That way the compound pages and its metadata are as stable as a regular page. -- 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/