function-graph: add option to calculate graph time or not

graph time is the time that a function is executing another function.
Thus if function A calls B, if graph-time is set, then the time for
A includes B. This is the default behavior. But if graph-time is off,
then the time spent executing B is subtracted from A.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 015a3d22cf74..9e0a8d245e55 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -365,6 +365,7 @@ struct ftrace_ret_stack {
         unsigned long ret;
         unsigned long func;
         unsigned long long calltime;
+        unsigned long long subtime;
 };
 
 /*
@@ -376,8 +377,6 @@ extern void return_to_handler(void);
 
 extern int
 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth);
-extern void
-ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret);
 
 /*
  * Sometimes we don't want to trace a function with the function