Steven Rostedt (VMware) a3ad1a7e39 ftrace/x86: Add a counter to test function_graph with direct ...

As testing for direct calls from the function graph tracer adds a little
overhead (which is a lot when tracing every function), add a counter that
can be used to test if function_graph tracer needs to test for a direct
caller or not.

It would have been nicer if we could use a static branch, but the static
branch logic fails when used within the function graph tracer trampoline.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

2019-11-13 09:36:49 -05:00

26 KiB

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