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@@ -127,12 +127,17 @@ config BOOT_TRACER
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select TRACING
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help
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This tracer helps developers to optimize boot times: it records
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- the timings of the initcalls. Its aim is to be parsed by the
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- /scripts/bootgraph.pl tool to produce pretty graphics about
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- boot inefficiencies, giving a visual representation of the
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- delays during initcalls. Note that tracers self tests can't
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- be enabled if this tracer is selected since only one tracer
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- should touch the tracing buffer at a time.
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+ the timings of the initcalls and traces key events and the identity
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+ of tasks that can cause boot delays, such as context-switches.
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+
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+ Its aim is to be parsed by the /scripts/bootgraph.pl tool to
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+ produce pretty graphics about boot inefficiencies, giving a visual
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+ representation of the delays during initcalls - but the raw
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+ /debug/tracing/trace text output is readable too.
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+
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+ ( Note that tracing self tests can't be enabled if this tracer is
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+ selected, because the self-tests are an initcall as well and that
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+ would invalidate the boot trace. )
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config STACK_TRACER
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bool "Trace max stack"
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Ingo Molnar