Poster: Feasibility of Runtime-Neutral Wasm Instrumentation for Edge-Cloud Workload Handover

In edge computing, flexibly offloading or handing over computing workloads among devices, edge, and cloud, achieved by live migration, is crucial because of its hierarchical and heterogeneous structure. Implementing the process migration requires the runtime system to capture and restore the state of a running application at any arbitrary time. WebAssembly (Wasm) has attracted attention as a common platform for edge computing since it provides not only architecture neutrality and secure sandboxing as a lightweight VM but also performs at a native-level performance with AOT/JIT code optimization. Unfortunately, the different code optimizations in various Wasm runtimes make it harder to insert instrumentation code into application binary at runtime. We are currently developing a self-hosted Wasm runtime, i.e., a runtime that can be executed on another runtime as a Wasm application instrumentation mechanism while handling the runtime heterogeneity, including AOT/JIT code transformation. One of the major concerns in our proposal is the overhead caused by the intervention of another runtime for instrumentation. This study discusses the feasibility of a self-hosted runtime with instrumentation for obtaining the application's running state by comparing it with existing methods and evaluating it through preliminary experiments.