On Tue, Jan 05, 2010 at 12:53:23PM -0700, Troy Heber wrote:
> Source: linux-2.6
> Version: 2.6.32-3
> Severity: wishlist
>
> Currently Ftrace is enabled in the kernel, CONFIG_FTRACE=y and
> CONFIG_DYNAMIC_FTRACE=y. However, some the most useful tracers, such
> as CONFIG_FUNCTION_TRACER and CONFIG_STACK_TRACER, are disabled. For
> example:
>
> CONFIG_FTRACE=y
> # CONFIG_FUNCTION_TRACER is not set
> # CONFIG_IRQSOFF_TRACER is not set
> # CONFIG_SYSPROF_TRACER is not set
> # CONFIG_SCHED_TRACER is not set
> # CONFIG_FTRACE_SYSCALLS is not set
> ...
> # CONFIG_POWER_TRACER is not set
> # CONFIG_STACK_TRACER is not set
>
> Since Dynamic Ftrace is already enabled, I can't think of down side to
> enabling the actual tracers. Please consider this a wishlist request
> to enabled them.
Of FUNCTION_TRACER, Kconfig says:
If it's runtime disabled
(the bootup default), then the overhead of the instructions is very
small and not measurable even in micro-benchmarks.
And for STACK_TRACER:
If this is configured with DYNAMIC_FTRACE then it will not have any
overhead while the stack tracer is disabled.
So I've gone ahead and enabled them in svn.
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