Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels

From: H. Peter Anvin
Date: Mon Apr 07 2014 - 15:29:25 EST

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?


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