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collector/ftrace: Handle missing kprobe_events file

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Deal cleanly with kernels that are compiled without kprobe events.
This commit is contained in:
Douglas Raillard 2025-02-03 16:02:54 +00:00 committed by Marc Bonnici
parent 499ea4753c
commit f60fa59ac1
1 changed files with 6 additions and 2 deletions
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8
devlib/collector/ftrace.py
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@ -242,7 +242,10 @@ class FtraceCollector(CollectorBase):
def reset(self):
# Save kprobe events
kprobe_events = self.target.read_value(self.kprobe_events_file)
try:
kprobe_events = self.target.read_value(self.kprobe_events_file)
except TargetStableError:
kprobe_events = None
self.target.execute('{} reset -B devlib'.format(self.target_binary),
as_root=True, timeout=TIMEOUT)
@ -262,7 +265,8 @@ class FtraceCollector(CollectorBase):
self.target.write_value(self.function_profile_file, 0, verify=False)
# Restore kprobe events
self.target.write_value(self.kprobe_events_file, kprobe_events)
if kprobe_events:
self.target.write_value(self.kprobe_events_file, kprobe_events)
self._reset_needed = False