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This paper presents a software-controlled technique for managing the heterogeneous memory resources of next generation multicore platforms with fast 3D die-stacked memory and additional slow off-chip memory. Implemented for virtualized server systems, the technique detects the 'hot' pages critical to program performance in order to then maintain them in the scarce fast 3D memory resources. Challenges overcome for the technique's implementation include the need to minimize its runtime overheads, the lack of hypervisor-level direct visibility into the memory access behavior of guest virtual machines, and the need to make page migration transparent to guests. This paper presents hypervisor-level mechanisms that (i) build a page access history of virtual machines, by periodically scanning page-table access bits and (ii) intercept guest page table operations to create mirrored page-tables and enable guest-transparent page migration. The methods are implemented in the Xen hypervisor and evaluated on a larger scale multicore platform. The resulting ability to characterize the memory behavior of representative server workloads demonstrates the feasibility of software-managed heterogeneous memory resources.