Enable tracing only for one function and its children?

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* Enable tracing only for one function and its children?
@ 2018-11-16 22:37 Timur Tabi
  2018-11-16 22:49 ` Keith Busch
  0 siblings, 1 reply; 2+ messages in thread
From: Timur Tabi @ 2018-11-16 22:37 UTC (permalink / raw)
  To: lkml

Is there a way to enable ftrace tracing only for one specific function
and all the functions it calls?  Then when the function returns,
disable tracing until the next time?

When I pass the function name only to set_ftrace_filter, it literally
only traces that function, which doesn't help me.  I tried setting
writing "nvidia_ioctl:traceon" to set_ftrace_filter, but that just
gave me an "invalid argument" error.  And even if that did work, I
don't know what function to use for :traceoff.

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: Enable tracing only for one function and its children?
  2018-11-16 22:37 Enable tracing only for one function and its children? Timur Tabi
@ 2018-11-16 22:49 ` Keith Busch
  0 siblings, 0 replies; 2+ messages in thread
From: Keith Busch @ 2018-11-16 22:49 UTC (permalink / raw)
  To: Timur Tabi; +Cc: lkml

On Fri, Nov 16, 2018 at 04:37:55PM -0600, Timur Tabi wrote:
> Is there a way to enable ftrace tracing only for one specific function
> and all the functions it calls?  Then when the function returns,
> disable tracing until the next time?
> 
> When I pass the function name only to set_ftrace_filter, it literally
> only traces that function, which doesn't help me.  

I think you're looking for the set_graph_function option for the
function_graph tracer.

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2018-11-16 22:37 Enable tracing only for one function and its children? Timur Tabi
2018-11-16 22:49 ` Keith Busch

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