tracing/ftrace: add the boot tracer

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Add the boot/initcall tracer.

It's primary purpose is to be able to trace the initcalls.

It is intended to be used with scripts/bootgraph.pl after some small
improvements.

Note that it is not active after its init. To avoid tracing (and so
crashing) before the whole tracing engine init, you have to explicitly
call start_boot_trace() after do_pre_smp_initcalls() to enable it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Frédéric Weisbecker 2008-09-23 11:32:08 +01:00 • committed by Ingo Molnar

parent aa5d9151f7

commit d13744cd6e

3 changed files with 124 additions and 0 deletions

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include/linux/ftrace.h

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