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trace/ftrace: Support the 'function' tracer

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This tracer is similar to the 'function_graph' tracer in that it helps us
trace function calls. It is however more lightweight, and only traces
functions entries (along with the caller of the function). It can also
happen that the kernel has support for the 'function' tracer but not for
'function_graph' (the opposite cannot be true, however).
This commit is contained in:
Valentin Schneider 2019-11-26 17:52:16 +00:00 committed by Marc Bonnici
parent e7bd2a5b22
commit cf26dee308
1 changed files with 6 additions and 0 deletions
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6
devlib/trace/ftrace.py
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@ -184,6 +184,12 @@ class FtraceCollector(TraceCollector):
# times.
if not selected_events:
selected_events = ['sched_wakeup_new']
# Function tracing
elif self.tracer == 'function':
self.function_string = _build_graph_functions(selected_functions, False)
# Function graphing
elif self.tracer == 'function_graph':
self.function_string = _build_graph_functions(selected_functions, trace_children_functions)