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ftrace: Avoid repeated available events query

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FtraceCollector.available_events is not memoized anymore as the set of
events supported by the target can change dynamically (e.g. loading a
kernel module).

This means that calling self.available_events is somewhat expensive, so
avoid doing it in a loop. Instead, save the events in a variable and
reuse it in the function to save a substantial amount of time.
This commit is contained in:
Douglas Raillard 2023-04-05 17:29:25 +01:00 committed by Marc Bonnici
parent fade6b4247
commit 4b13ee79eb
1 changed files with 2 additions and 1 deletions
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3
devlib/collector/ftrace.py
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@ -137,10 +137,11 @@ class FtraceCollector(CollectorBase):
for _event in events
)
available_events = self.available_events
unavailable_events = [
event
for event in self.events
if not event_is_in_list(event, self.available_events)
if not event_is_in_list(event, available_events)
]
if unavailable_events:
message = 'Events not available for tracing: {}'.format(