CONFIG_PREEMPT_TRACER: Preemption-off Latency Tracer

General informations

The Linux kernel configuration item CONFIG_PREEMPT_TRACER:

• prompt: Preemption-off Latency Tracer
• type: bool
• depends on: CONFIG_PREEMPTION
• defined in kernel/trace/Kconfig
• found in Linux kernels: 2.6.27–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11

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/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

LKDDb

Raw data from LKDDb:

• (none)

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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