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collector: ftrace: Use trace-cmd start --cmdlines-size

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Use --cmdlines-size option rather than setting the file manually.
This commit is contained in:
Douglas Raillard 2021-09-01 11:11:33 +01:00 committed by Marc Bonnici
parent 5671b49c2f
commit 917800ffa6
1 changed files with 2 additions and 13 deletions
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15
devlib/collector/ftrace.py
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@ -105,7 +105,6 @@ class FtraceCollector(CollectorBase):
self.function_profile_file = self.target.path.join(self.tracing_path, 'function_profile_enabled')
self.marker_file = self.target.path.join(self.tracing_path, 'trace_marker')
self.ftrace_filter_file = self.target.path.join(self.tracing_path, 'set_ftrace_filter')
self.save_cmdlines_size_file = self.target.path.join(self.tracing_path, 'saved_cmdlines_size')
self.available_tracers_file = self.target.path.join(self.tracing_path, 'available_tracers')
self.host_binary = which('trace-cmd')
@ -243,25 +242,15 @@ class FtraceCollector(CollectorBase):
with contextlib.suppress(TargetStableError):
self.target.write_value('/proc/sys/kernel/kptr_restrict', 0)
try:
self.target.write_value(self.save_cmdlines_size_file, self.saved_cmdlines_nr)
except TargetStableError as e:
message = 'Could not set "save_cmdlines_size"'
if self.strict:
self.logger.error(message)
raise e
else:
self.logger.warning(message)
self.logger.debug(e)
self.target.execute(
'{} start {buffer_size} {clock} {events} {tracer} {functions}'.format(
'{} start {buffer_size} {cmdlines_size} {clock} {events} {tracer} {functions}'.format(
self.target_binary,
events=self.event_string,
tracer=tracer_string,
functions=tracecmd_functions,
buffer_size='-b {}'.format(self.buffer_size) if self.buffer_size is not None else '',
clock='-C {}'.format(self.trace_clock) if self.trace_clock else '',
cmdlines_size='--cmdlines-size {}'.format(self.saved_cmdlines_nr) if self.saved_cmdlines_nr is not None else '',
),
as_root=True,
)