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authorDoug Smythies <doug.smythies@gmail.com>2018-01-05 23:31:16 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-01-10 01:12:04 +0100
commitfbe313884d7ddd73ce457473cbdf3763f5b1d3da (patch)
treefefff741d584084e6984863c13532bca8e2043ac /tools/power
parentMerge tag 'linux-cpupower-4.16-rc1' of git://git.kernel.org/pub/scm/linux/ker... (diff)
downloadlinux-fbe313884d7ddd73ce457473cbdf3763f5b1d3da.tar.xz
linux-fbe313884d7ddd73ce457473cbdf3763f5b1d3da.zip
tools/power/x86/intel_pstate_tracer: Free the trace buffer memory
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>
Diffstat (limited to 'tools/power')
-rwxr-xr-xtools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py15
1 files changed, 15 insertions, 0 deletions
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 0b24dd9d01ff..29f50d4cfea0 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('../../')