Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933911AbaDIPj0 (ORCPT ); Wed, 9 Apr 2014 11:39:26 -0400 Received: from cantor2.suse.de ([195.135.220.15]:58975 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932898AbaDIPjX (ORCPT ); Wed, 9 Apr 2014 11:39:23 -0400 Date: Wed, 9 Apr 2014 16:39:17 +0100 From: Mel Gorman To: Konrad Rzeszutek Wilk Cc: "H. Peter Anvin" , Steven Noonan , Cyrill Gorcunov , David Vrabel , Linus Torvalds , Ingo Molnar , Rik van Riel , Andrew Morton , Peter Zijlstra , Andrea Arcangeli , Linux-MM , Linux-X86 , LKML , Pavel Emelyanov Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels Message-ID: <20140409153916.GT7292@suse.de> References: <20140407182854.GH7292@suse.de> <5342FC0E.9080701@zytor.com> <20140407193646.GC23983@moon> <5342FFB0.6010501@zytor.com> <20140407212535.GJ7292@suse.de> <20140408160250.GE31554@phenom.dumpdata.com> <20140408165123.GN7292@suse.de> <20140409151827.GA6445@phenom.dumpdata.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20140409151827.GA6445@phenom.dumpdata.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 09, 2014 at 11:18:27AM -0400, Konrad Rzeszutek Wilk wrote: > On Tue, Apr 08, 2014 at 05:51:23PM +0100, Mel Gorman wrote: > > On Tue, Apr 08, 2014 at 12:02:50PM -0400, Konrad Rzeszutek Wilk wrote: > > > .snip.. > > > > >>> David Vrabel has a patchset which I presumed would be pulled through > > > > >the > > > > >>> Xen tree this merge window: > > > > >>> > > > > >>> [PATCHv5 0/8] x86/xen: fixes for mapping high MMIO regions (and > > > > >remove > > > > >>> _PAGE_IOMAP) > > > > >>> > > > > >>> That frees up this bit. > > > > >>> > > > > >> > > > > >> Thanks, I was not aware of that patch. Based on it, I intend to > > > > >force > > > > >> automatic NUMA balancing to depend on !XEN and see what the reaction > > > > >is. If > > > > >> support for Xen is really required then it potentially be re-enabled > > > > >if/when > > > > >> that series is merged assuming they do not need the bit for something > > > > >else. > > > > >> > > > > > > > > > >Amazon EC2 does have large memory instance types with NUMA exposed to > > > > >the guest (e.g. c3.8xlarge, i2.8xlarge, etc), so it'd be preferable > > > > >(to me anyway) if we didn't require !XEN. > > > > > > What about the patch that David Vrabel posted: > > > > > > http://osdir.com/ml/general/2014-03/msg41979.html > > > > > > Has anybody taken it for a spin? > > > > Alternatively "[PATCH 4/5] mm: use paravirt friendly ops for NUMA > > hinting ptes" which modifies the NUMA pte helpers instead of the main > > set/clear ones. > > Ah nice! Looking forward to it being posted as non-RFC and could you also > please CC 'xen-devel@lists.xenproject.org' on it? > Yes I will. Unless the x86 maintainers push for it on the grounds that it is a functional fix for xen, I'm going to wait until after the merge window to resend it. That'd give it some chance of being tested in -next before hitting mainline. -- Mel Gorman SUSE Labs -- 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/