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Date: Mon, 07 Apr 2014 12:27:10 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
MIME-Version: 1.0
Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address
 bits PMD and PTE levels
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>
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To: Mel Gorman <mgorman@suse.de>, Cyrill Gorcunov <gorcunov@gmail.com>
Cc: David Vrabel <david.vrabel@citrix.com>, Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, Steven Noonan <steven@uplinklabs.net>, Rik van Riel <riel@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Peter Zijlstra <peterz@infradead.org>, Andrea Arcangeli <aarcange@redhat.com>, Linux-MM <linux-mm@kvack.org>, Linux-X86 <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>, Pavel Emelyanov <xemul@parallels.com>

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?

	-hpa

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