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ftrace: add support to collect function stats

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Function stats can be collected while events are accumulated into a trace.

This function adds the required support to start and stop functions
profiling across a trace collection.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
This commit is contained in:
Patrick Bellasi 2016-01-26 15:33:21 +00:00
parent c5bc987226
commit 7f5a150b4f
1 changed files with 11 additions and 0 deletions
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11
devlib/trace/ftrace.py
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@ -75,8 +75,10 @@ class FtraceCollector(TraceCollector):
# Setup tracing paths
self.available_functions_file = self.target.path.join(self.tracing_path, 'available_filter_functions')
self.buffer_size_file = self.target.path.join(self.tracing_path, 'buffer_size_kb')
self.current_tracer_file = self.target.path.join(self.tracing_path, 'current_tracer')
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.host_binary = which('trace-cmd')
self.kernelshark = which('kernelshark')
@ -123,8 +125,17 @@ class FtraceCollector(TraceCollector):
if 'cpufreq' in self.target.modules:
self.logger.debug('Trace CPUFreq frequencies')
self.target.cpufreq.trace_frequencies()
# Enable kernel function profiling
if self.functions:
self.target.execute('echo nop > {}'.format(self.current_tracer_file))
self.target.execute('echo 0 > {}'.format(self.function_profile_file))
self.target.execute('echo {} > {}'.format(self.function_string, self.ftrace_filter_file))
self.target.execute('echo 1 > {}'.format(self.function_profile_file))
def stop(self):
# Disable kernel function profiling
if self.functions:
self.target.execute('echo 1 > {}'.format(self.function_profile_file))
if 'cpufreq' in self.target.modules:
self.logger.debug('Trace CPUFreq frequencies')
self.target.cpufreq.trace_frequencies()