From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ee0-f50.google.com (mail-ee0-f50.google.com [74.125.83.50]) by kanga.kvack.org (Postfix) with ESMTP id ABD576B0037 for ; Tue, 8 Apr 2014 12:51:28 -0400 (EDT) Received: by mail-ee0-f50.google.com with SMTP id c13so904599eek.23 for ; Tue, 08 Apr 2014 09:51:28 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id x47si3524515eel.223.2014.04.08.09.51.27 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 08 Apr 2014 09:51:27 -0700 (PDT) Date: Tue, 8 Apr 2014 17:51:23 +0100 From: Mel Gorman Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels Message-ID: <20140408165123.GN7292@suse.de> References: <20140407154935.GD7292@suse.de> <20140407161910.GJ1444@moon> <20140407182854.GH7292@suse.de> <5342FC0E.9080701@zytor.com> <20140407193646.GC23983@moon> <5342FFB0.6010501@zytor.com> <20140407212535.GJ7292@suse.de> <20140408160250.GE31554@phenom.dumpdata.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20140408160250.GE31554@phenom.dumpdata.com> Sender: owner-linux-mm@kvack.org List-ID: 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 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. -- Mel Gorman SUSE Labs -- 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