From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-la0-f42.google.com (mail-la0-f42.google.com [209.85.215.42]) by kanga.kvack.org (Postfix) with ESMTP id 1892C6B0031 for ; Mon, 7 Apr 2014 15:36:49 -0400 (EDT) Received: by mail-la0-f42.google.com with SMTP id ec20so5222769lab.15 for ; Mon, 07 Apr 2014 12:36:49 -0700 (PDT) Received: from mail-lb0-x22e.google.com (mail-lb0-x22e.google.com [2a00:1450:4010:c04::22e]) by mx.google.com with ESMTPS id e6si13012013lah.79.2014.04.07.12.36.48 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 07 Apr 2014 12:36:48 -0700 (PDT) Received: by mail-lb0-f174.google.com with SMTP id u14so5183767lbd.19 for ; Mon, 07 Apr 2014 12:36:48 -0700 (PDT) Date: Mon, 7 Apr 2014 23:36:46 +0400 From: Cyrill Gorcunov Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels Message-ID: <20140407193646.GC23983@moon> References: <1396883443-11696-1-git-send-email-mgorman@suse.de> <1396883443-11696-3-git-send-email-mgorman@suse.de> <5342C517.2020305@citrix.com> <20140407154935.GD7292@suse.de> <20140407161910.GJ1444@moon> <20140407182854.GH7292@suse.de> <5342FC0E.9080701@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5342FC0E.9080701@zytor.com> Sender: owner-linux-mm@kvack.org List-ID: To: "H. Peter Anvin" Cc: Mel Gorman , David Vrabel , Linus Torvalds , Ingo Molnar , Steven Noonan , Rik van Riel , Andrew Morton , Peter Zijlstra , Andrea Arcangeli , Linux-MM , Linux-X86 , LKML , Pavel Emelyanov On Mon, Apr 07, 2014 at 12:27:10PM -0700, H. Peter Anvin wrote: > On 04/07/2014 11:28 AM, Mel Gorman wrote: > > > > I had considered the soft-dirty tracking usage of the same bit. I thought I'd > > be able to swizzle around it or a further worst case of having soft-dirty and > > automatic NUMA balancing mutually exclusive. Unfortunately upon examination > > it's not obvious how to have both of them share a bit and I suspect any > > attempt to will break CRIU. In my current tree, NUMA_BALANCING cannot be > > set if MEM_SOFT_DIRTY which is not particularly satisfactory. Next on the > > list is examining if _PAGE_BIT_IOMAP can be used. > > Didn't we smoke the last user of _PAGE_BIT_IOMAP? Seems so, at least for non-kernel pages (not considering this bit references in xen code, which i simply don't know but i guess it's used for kernel pages only). -- 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