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@@ -141,8 +141,17 @@ config STACK_TRACER
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select FTRACE
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select FTRACE
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select STACKTRACE
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select STACKTRACE
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help
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help
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- This tracer records the max stack of the kernel, and displays
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- it in debugfs/tracing/stack_trace
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+ This special tracer records the maximum stack footprint of the
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+ kernel and displays it in debugfs/tracing/stack_trace.
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+
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+ This tracer works by hooking into every function call that the
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+ kernel executes, and keeping a maximum stack depth value and
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+ stack-trace saved. Because this logic has to execute in every
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+ kernel function, all the time, this option can slow down the
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+ kernel measurably and is generally intended for kernel
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+ developers only.
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+
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+ Say N if unsure.
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config DYNAMIC_FTRACE
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config DYNAMIC_FTRACE
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bool "enable/disable ftrace tracepoints dynamically"
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bool "enable/disable ftrace tracepoints dynamically"
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Ingo Molnar