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CONFIG_DEBUG_PREEMPT: Debug preemptible kernel

General informations

The Linux kernel configuration item CONFIG_DEBUG_PREEMPT:

Help text

If you say Y here then the kernel will use a debug variant of the commonly used smp_processor_id() function and will print warnings if kernel code uses it in a preemption-unsafe way. Also, the kernel will detect preemption count underflows.

This option has potential to introduce high runtime overhead, depending on workload as it triggers debugging routines for each this_cpu operation. It should only be used for debugging purposes.



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