Userspace Bypass: Accelerating Syscall-intensive Applications
summary
Userspace Bypass (UB) transparently moves short user-space instruction sequences into kernel space by identifying hot fast paths, translating them into a Binary Translation Cache, and enforcing Software-Based Fault Isolation so unmodified binaries run in-kernel. Implementation uses a kernel profiler and runtime in C plus a Python translator. Microbenchmarks speed I/O paths by 30.3–88.3% and Redis GET throughput improves 4.4–10.8% in virtualized setups with KPTI on; benefits shrink when KPTI is disabled.
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chapters (7)
- 0:00Introduction
- 1:45Syscall costs and optimizations
- 3:08US bypass design
- 5:41Translator security
- 8:10Implementation setup
- 9:41Performance results
- 10:46Conclusion
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