* 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
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