Department of Computer Science and EngineeringHeterogeneous memory systems are composed of several types of memory, and are used in various
computing domains. Each memory node in heterogeneous memory systems has different characteristics
and performances. A particularly significant difference can be found in access latency and memory
bandwidth. Therefore, the heterogeneity between memories must be considered to utilize the performance
of a heterogeneous memory system. However, most of the previous works did not consider the
bandwidth difference of the memory nodes constituting a heterogeneous memory system.
The present work proposes bandwidth-aware memory placement and migration policies to solve the
problem caused by the bandwidth difference of the memory nodes in a heterogeneous memory system.
We implement three bandwidth-aware memory placement policies and one bandwidth-aware migration
policy on the Linux kernel, then quantitatively experiment on and evaluate them in real systems. In
addition, we prove that our proposed bandwidth-aware memory placement and migration policies can
achieve a higher performance compared to conventional memory placement and migration policies that
do not consider the bandwidth differences between heterogeneous memory nodes.ope
