default or selected kernelversion does not have config value CONFIG_BOOT_TRACER.
Result is shown for kernelversion 5.4.229
Trace boot initcalls
modulename: trace_boot.ko
configname: CONFIG_BOOT_TRACER
Linux Kernel Configuration
└─>Tracers
└─>Trace boot initcalls
In linux kernel since version 2.6.28 (release Date: 2008-12-24)
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.
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.