CONFIG_PREEMPTIRQ_DELAY_TEST: Test module to create a preempt / IRQ disable delay thread to test latency tracers

General informations

The Linux kernel configuration item CONFIG_PREEMPTIRQ_DELAY_TEST has multiple definitions:

Test module to create a preempt / IRQ disable delay thread to test latency tracers found in kernel/trace/Kconfig

The configuration item CONFIG_PREEMPTIRQ_DELAY_TEST:

• prompt: Test module to create a preempt / IRQ disable delay thread to test latency tracers
• type: tristate
• depends on: CONFIG_m
• defined in kernel/trace/Kconfig
• found in Linux kernels: 5.6–5.19, 6.0–6.8, 6.9-rc+HEAD
• modules built: preemptirq_delay_test

Help text

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

Preempt / IRQ disable delay thread to test latency tracers found in kernel/trace/Kconfig

The configuration item CONFIG_PREEMPTIRQ_DELAY_TEST:

• prompt: Preempt / IRQ disable delay thread to test latency tracers
• type: tristate
• depends on: CONFIG_m
• defined in kernel/trace/Kconfig
• found in Linux kernels: 4.19–4.20, 5.0–5.5
• modules built: preemptirq_delay_test

Help text

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

Hardware

LKDDb

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, 6.0–6.8, 6.9-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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