Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753395AbaJGMpd (ORCPT ); Tue, 7 Oct 2014 08:45:33 -0400 Received: from mail-vc0-f179.google.com ([209.85.220.179]:45951 "EHLO mail-vc0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751094AbaJGMpc (ORCPT ); Tue, 7 Oct 2014 08:45:32 -0400 MIME-Version: 1.0 In-Reply-To: <87d2a5f1m4.fsf@linux.vnet.ibm.com> References: <20140930160510.GA15903@redhat.com> <20140930162201.GC15903@redhat.com> <20140930164047.GA18354@redhat.com> <20140930182059.GA24431@redhat.com> <20141002124537.GL17501@suse.de> <87d2a5f1m4.fsf@linux.vnet.ibm.com> Date: Tue, 7 Oct 2014 08:45:31 -0400 X-Google-Sender-Auth: s0K2dw6G0mEE-pHv0wPyLGhV1Ws Message-ID: Subject: Re: pipe/page fault oddness. From: Linus Torvalds To: "Aneesh Kumar K.V" Cc: Mel Gorman , Hugh Dickins , Dave Jones , Al Viro , Linux Kernel , Rik van Riel , Ingo Molnar , Michel Lespinasse , "Kirill A. Shutemov" , Sasha Levin , Benjamin Herrenschmidt Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 6, 2014 at 3:18 PM, Aneesh Kumar K.V wrote: > > Are we still looking at these options ? I could look at implementing the > first option which will also enable us to free up one pte bit. We definitely are. If you can test my patch (with the small follow-up fix), and do the necessary changes for ppc64, that would be good. I looked quickly at the ppc64 side, and it didn't look too painful. Using pte_protnone() instead of pte_numa() should remove move lines than it adds there too.. Linus -- 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/