Tasklets are scheduled through the softirq mechanism, sometimes through ksoftirqd (a per-CPU kernel thread), when the machine is under heavy soft-interrupt load.
通过软中断机制来调度微线程，当机器处于严重软件中断负荷之下时， 可通过 ksoftirqd（一种每 CPU 内核线程）软中断来调度。
Finally, the mechanism and the implementation of soft interrupt are introduced.
最后，介绍了软中断机制及其实现。
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