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CONFIG_PREEMPT_TRACER: Preemption-off Latency Tracer

General informations

The Linux kernel configuration item CONFIG_PREEMPT_TRACER:

Help text

This option measures the time spent in preemption-off critical sections, with microsecond accuracy.

The default measurement method is a maximum search, which is disabled by default and can be runtime (re-)started via:

echo 0 > /sys/kernel/debug/tracing/tracing_max_latency

(Note that kernel size and overhead increase with this option enabled. This option and the irqs-off timing option can be used together or separately.)

Hardware

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