ftrace/x86: Add a counter to test function_graph with direct

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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>

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Steven Rostedt (VMware) 2019-11-08 13:12:57 -05:00

parent 562955fe6a

commit a3ad1a7e39

3 changed files with 11 additions and 3 deletions

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8

arch/x86/kernel/ftrace.c

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2

include/linux/ftrace.h

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4

kernel/trace/ftrace.c

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