The trace buffer memory should be, mostly, freed after the buffer has been output.
This patch is required before a future patch that will allow the user to override the default, and specify the trace buffer memory allocation as a command line option. Signed-off-by: Doug Smythies <[email protected]> --- .../power/x86/intel_pstate_tracer/intel_pstate_tracer.py | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py index 0b24dd9..29f50d4 100755 --- a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py +++ b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py @@ -411,6 +411,16 @@ def set_trace_buffer_size(): print('IO error setting trace buffer size ') quit() +def free_trace_buffer(): + """ Free the trace buffer memory """ + + try: + open('/sys/kernel/debug/tracing/buffer_size_kb' + , 'w').write("1") + except: + print('IO error setting trace buffer size ') + quit() + def read_trace_data(filename): """ Read and parse trace data """ @@ -583,4 +593,9 @@ for root, dirs, files in os.walk('.'): for f in files: fix_ownership(f) +clear_trace_file() +# Free the memory +if interval: + free_trace_buffer() + os.chdir('../../') -- 2.7.4
