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ftrace: Expose FtraceCollector.available_events

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Expose the list of events the kernel supports.

Signed-off-by: Douglas RAILLARD <douglas.raillard@arm.com>
This commit is contained in:
Douglas RAILLARD 2019-11-04 12:25:00 +00:00 committed by Marc Bonnici
parent 656da00d2a
commit bbe3bb6adb
1 changed files with 9 additions and 4 deletions
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13
devlib/trace/ftrace.py
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@ -125,9 +125,6 @@ class FtraceCollector(TraceCollector):
self.target_binary = 'trace-cmd' self.target_binary = 'trace-cmd'
# Validate required events to be traced # Validate required events to be traced
available_events = self.target.execute(
'cat {}'.format(self.available_events_file),
as_root=True).splitlines()
selected_events = [] selected_events = []
for event in self.events: for event in self.events:
# Convert globs supported by FTrace into valid regexp globs # Convert globs supported by FTrace into valid regexp globs
@ -136,7 +133,7 @@ class FtraceCollector(TraceCollector):
_event = '*' + event _event = '*' + event
event_re = re.compile(_event.replace('*', '.*')) event_re = re.compile(_event.replace('*', '.*'))
# Select events matching the required ones # Select events matching the required ones
if not list(filter(event_re.match, available_events)): if not list(filter(event_re.match, self.available_events)):
message = 'Event [{}] not available for tracing'.format(event) message = 'Event [{}] not available for tracing'.format(event)
if strict: if strict:
raise TargetStableError(message) raise TargetStableError(message)
@ -189,6 +186,14 @@ class FtraceCollector(TraceCollector):
""" """
return self.target.read_value(self.available_tracers_file).split(' ') return self.target.read_value(self.available_tracers_file).split(' ')
@property
@memoized
def available_events(self):
"""
List of ftrace events supported by the target's kernel.
"""
return self.target.read_value(self.available_events_file).splitlines()
def reset(self): def reset(self):
if self.buffer_size: if self.buffer_size:
self._set_buffer_size() self._set_buffer_size()