262 def ReadHeader(perf, file_name):  argument
263 …return subprocess.Popen([perf, "script", "--header-only", "--input", file_name], stdout=subprocess…
366 	file_name = p.Value()
367 	if not os.path.exists(file_name):
369 	return file_name
389 def PerfDoubleQuickCommands(cmd, file_name):  argument
393 	times_cmd = ["perf", "script", "--ns", "--input", file_name, "--itrace=qqi"]
490 def SplitTimeRangesByTraceDataDensity(time_ranges, cpus, nr, cmd, file_name, per_cpu, min_size, min…  argument
495 	cnts_cmd, times_cmd = PerfDoubleQuickCommands(cmd, file_name)
739 		self.file_name = DetermineInputFileName(self.cmd)
740 		self.hdr = ReadHeader(self.perf, self.file_name)
773 								  self.orig_cmd, self.file_name, self.per_cpu,