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@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>