Re: [PATCH 14/23 -v8] Add tracing of context switches

Tim Bird
2008-02-05T17:12:48Z

Steven Rostedt wrote:
> Index: linux-mcount.git/lib/tracing/Kconfig
> ===================================================================
> --- linux-mcount.git.orig/lib/tracing/Kconfig 2008-01-30 15:18:18.000000000 -0500
> +++ linux-mcount.git/lib/tracing/Kconfig 2008-01-30 15:32:33.000000000 -0500
> @@ -23,3 +23,12 @@ config FUNCTION_TRACER
> insert a call to an architecture specific __mcount routine,
> that the debugging mechanism using this facility will hook by
> providing a set of inline routines.
> +
> +config CONTEXT_SWITCH_TRACER
> + bool "Trace process context switches"
> + depends on DEBUG_KERNEL
> + select TRACING
> + help
> + This tracer hooks into the context switch and records
> + all switching of tasks.
> +

This needs a "select MARKERS" or it doesn't compile.

My config has:

CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_TRACE_IRQFLAGS=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_FUNCTION_TRACER=y
# CONFIG_EVENT_TRACER is not set
# CONFIG_WAKEUP_TRACER is not set
CONFIG_CONTEXT_SWITCH_TRACER=y

-- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================