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collector/ftrace: Make emitting cpu_frequency_devlib and extra idle events dependent on the configured events

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Make cpu_frequency_devlib dependent on whether the "cpu_frequency" event
has been selected rather than dependent on the cpufreq devlib module
being loaded on the target.

The old behavior became particularly problematic with the lazy loading
of modules. However, it was never a reliable way of knowing if the user
was interested in the frequency or not.

Apply a similar mechanism for the extra idle state transitions only done
if "cpu_idle" event is selected.
This commit is contained in:
Douglas Raillard 2025-02-03 15:51:58 +00:00 committed by Marc Bonnici
parent ae8149077c
commit eb9e0c9870
1 changed files with 29 additions and 8 deletions
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37
devlib/collector/ftrace.py
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@ -93,7 +93,6 @@ class FtraceCollector(CollectorBase):
self.host_binary = None
self.start_time = None
self.stop_time = None
self.event_string = None
self.function_string = None
self.trace_clock = trace_clock
self.saved_cmdlines_nr = saved_cmdlines_nr
@ -195,7 +194,11 @@ class FtraceCollector(CollectorBase):
elif self.tracer == 'function_graph':
self.function_string = _build_graph_functions(selected_functions, trace_children_functions)
self.event_string = _build_trace_events(selected_events)
self._selected_events = selected_events
@property
def event_string(self):
return _build_trace_events(self._selected_events)
@classmethod
def _resolve_tracing_path(cls, target, path):
@ -270,6 +273,26 @@ class FtraceCollector(CollectorBase):
self._reset_needed = False
def _trace_frequencies(self):
if 'cpu_frequency' in self._selected_events:
self.logger.debug('Trace CPUFreq frequencies')
try:
mod = self.target.cpufreq
except TargetStableError as e:
self.logger.error(f'Could not trace CPUFreq frequencies as the cpufreq module cannot be loaded: {e}')
else:
mod.trace_frequencies()
def _trace_idle(self):
if 'cpu_idle' in self._selected_events:
self.logger.debug('Trace CPUIdle states')
try:
mod = self.target.cpuidle
except TargetStableError as e:
self.logger.error(f'Could not trace CPUIdle states as the cpuidle module cannot be loaded: {e}')
else:
mod.perturb_cpus()
@asyncf
async def start(self):
self.start_time = time.time()
@ -302,12 +325,10 @@ class FtraceCollector(CollectorBase):
)
if self.automark:
self.mark_start()
if 'cpufreq' in self.target.modules:
self.logger.debug('Trace CPUFreq frequencies')
self.target.cpufreq.trace_frequencies()
if 'cpuidle' in self.target.modules:
self.logger.debug('Trace CPUIdle states')
self.target.cpuidle.perturb_cpus()
self._trace_frequencies()
self._trace_idle()
# Enable kernel function profiling
if self.functions and self.tracer is None:
target = self.target