Lightweight Virtual Memory Support for Zero-Copy Sharing of Pointer-Rich Data Structures in Heterogeneous Embedded SoCs
Pirmin Vogel, Andrea Marongiu, Luca Benini · IEEE Transactions on Parallel and Distributed Systems · 2016
While high-end heterogeneous systems are increasingly supporting heterogeneous uniform memory access (hUMA), their low-power counterparts still lack basic features like virtual memory support for accelerators. Instead of simply passing pointers, explicit data management involving copies is needed which hampers programmability and performance. In this work, we evaluate a mixed hardware/software solution for lightweight virtual memory support for many-core accelerators in heterogeneous embedded systems-on-chip. Based on an input/output translation lookaside buffer managed by a host kernel-level driver, and compiler extensions protecting the accelerator's accesses to shared data, our solution is non-intrusive to the architecture of the accelerator cores, and enables zero-copy sharing of pointer-rich data structures.