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tools/power/x86/intel_pstate_tracer: Free the trace buffer memory

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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 <dsmythies@telus.net>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Doug Smythies 2018-01-05 14:31:16 -08:00 committed by Rafael J. Wysocki
parent cc85a6e2d0
commit fbe313884d
1 changed files with 15 additions and 0 deletions
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15
tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
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@ -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('../../')