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To improve system performance, operating systems (OSes) often undertake activities that require modification of virtual-to-physical address translations. For example, the OS may migrate data between physical pages to manage heterogeneous memory devices. We refer to such activities as page remappings. Unfortunately, page remappings are expensive. We show that a big part of this cost arises from address...
Computing is becoming increasingly heterogeneous with accelerators like GPUs being tightly integrated with CPUs on the same die. Extending the CPU's virtual addressing mechanism to these accelerators is a key step in making accelerators easily programmable. In this work, we analyze, using real-system measurements, shared virtual memory across the CPU and an integrated GPU. We make several key observations...
Large pages have long been used to mitigate address translation overheads on big-memory systems, particularly in virtualized environments where TLB miss overheads are severe. We show, however, that far from being a panacea, large pages are used sparingly by modern virtualization software. This is because large pages often preclude lightweight memory management, which can outweigh their Translation...
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