Messages in this thread | | | 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 |
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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).
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