CONFIG_HIST_TRIGGERS: Histogram triggers

General informations

The Linux kernel configuration item CONFIG_HIST_TRIGGERS:

• prompt: Histogram triggers
• type: bool
• depends on: CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
• defined in kernel/trace/Kconfig
• found in Linux kernels: 4.7–4.20, 5.0–5.19, 6.0–6.11

Help text

Hist triggers allow one or more arbitrary trace event fields to be aggregated into hash tables and dumped to stdout by reading a debugfs/tracefs file. They're useful for gathering quick and dirty (though precise) summaries of event activity as an initial guide for further investigation using more advanced tools.

Inter-event tracing of quantities such as latencies is also supported using hist triggers under this option.

See Documentation/trace/histogram.rst. If in doubt, say N.

Hardware

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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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