Abstract
The kernel spinlock has a non-negligible influence on the real-time performance of the multi-core RTOS. In order to protect mutual exclusive kernel data accessed in both task context and interrupt context by CPU-cores, the RTOS kernel uses existing FIFO spinlock algorithm as kernel spinlock must disable interrupt before acquiring lock, which will increase the interrupt response latency in the case of fierce competition for spinlock. In this work, the Interrupt Responsive Spinlock (IRS) mechanism based on MCS algorithm allows the CPU-cores to respond to interrupt during spin waiting, disable interrupt while holding spinlock, therefore the system can respond to interrupts in time without damaging OS kernel critical section. Besides, MCS-IRS maintains the compatibility with MCS semantics so that is transparent to the caller. Experiments show that MCS-IRS can eliminate the impact of spinlock fierce contention on Worst-Case Interrupt Response Latency, and has better multi-core scalability than MCS on Worst-Case Interrupt Disable Time, which can improve the real-time performance of multi-core RTOS.
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Zheng, J., Bian, J., Kuang, J. (2020). Interrupt Responsive Spinlock Mechanism Based on MCS for Multi-core RTOS. In: Shen, H., Sang, Y. (eds) Parallel Architectures, Algorithms and Programming. PAAP 2019. Communications in Computer and Information Science, vol 1163. Springer, Singapore. https://doi.org/10.1007/978-981-15-2767-8_3
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