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CONFIG_BOOT_TRACER: Trace boot initcalls

General informations

The Linux kernel configuration item CONFIG_BOOT_TRACER:

Help text

This tracer helps developers to optimize boot times: it records the timings of the initcalls and traces key events and the identity of tasks that can cause boot delays, such as context-switches.

Its aim is to be parsed by the scripts/bootgraph.pl tool to produce pretty graphics about boot inefficiencies, giving a visual representation of the delays during initcalls - but the raw /debug/tracing/trace text output is readable too.

You must pass in initcall_debug and ftrace=initcall to the kernel command line to enable this on bootup.

Hardware

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