I am writing a small test tool to find out how quickly some kernel code can wake up to some events. So far, I have tested it under some userspace workload, such as running a few high-priority threads. I am interested in adding some more kernel workload, to see if the code still runs with good latencies. The things I think of are like adding some delays in the interrupt context, so the kernel cannot preempt, or spawning some busy tasklets or kthreads. Do you have suggestions about which would be similar to real system loads? Or is there a tool to do so?
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