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The Linux kernel configuration item CONFIG_PREEMPTIRQ_DELAY_TEST
has multiple definitions:
kernel/trace/Kconfig
The configuration item CONFIG_PREEMPTIRQ_DELAY_TEST:
CONFIG_m
preemptirq_delay_test
Select this option to build a test module that can help test latency tracers by executing a preempt or irq disable section with a user configurable delay. The module busy waits for the duration of the critical section.
For example, the following invocation generates a burst of three irq-disabled critical sections for 500us: modprobe preemptirq_delay_test test_mode=irq delay=500 burst_size=3
What's more, if you want to attach the test on the cpu which the latency tracer is running on, specify cpu_affinity=cpu_num at the end of the command.
If unsure, say N
kernel/trace/Kconfig
The configuration item CONFIG_PREEMPTIRQ_DELAY_TEST:
CONFIG_m
preemptirq_delay_test
Select this option to build a test module that can help test latency tracers by executing a preempt or irq disable section with a user configurable delay. The module busy waits for the duration of the critical section.
For example, the following invocation generates a burst of three irq-disabled critical sections for 500us: modprobe preemptirq_delay_test test_mode=irq delay=500 burst_size=3
If unsure, say N
Raw data from LKDDb:
lkddb module preemptirq_delay_test CONFIG_PREEMPTIRQ_DELAY_TEST : kernel/trace/Kconfig : "Test module to create a preempt / IRQ disable delay thread to test latency tracers" # in 4.19–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
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Automatically generated (in year 2024). See also LKDDb sources on GitLab