Книга: Embedded Linux Primer: A Practical, Real-World Approach

17.4.4. Wakeup Latency History

17.4.4. Wakeup Latency History

To enable wakeup latency history, enable CONFIG_WAKEUP_LATENCY_HIST while CONFIG_WAKEUP_TIMING is also enabled. This option dumps all the wakeup timing measurements enabled by CONFIG_WAKEUP_TIMING into a file for later analysis. An example of this file and its contents is presented shortly when we examine interrupt off history.

• CRITICAL_PREEMPT_TIMING : Measures the time spent in critical sections with preempt disabled.

• PREEMPT_OFF_HIST : Similar to WAKEUP_LATENCY_HIST. Gathers preempt off timing measurements into a bin for later analysis.

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