source: tools/perf/process_stat_array.py@ e49b6f5

#!/usr/bin/python3

import argparse, os, sys, re

def dir_path(string):
    if os.path.isdir(string):
        return string
    else:
        raise NotADirectoryError(string)

parser = argparse.ArgumentParser()
parser.add_argument('--path', type=dir_path, default=".cfadata", help= 'paste path to biog.txt file')

try :
        args = parser.parse_args()
except NotADirectoryError:
        print("Must use option --path to existing directory or have .cfadata in current directory", file=sys.stderr)
        sys.exit(1)

root, _, filenames = next(os.walk(args.path))

merged = []
counters = {}

#open the files
for filename in filenames:
        try:
                m = re.search('[A-z]+0x([0-9a-f]+)\.data', filename)
                me = m.group(1)
                counters[me] = 0
                with open(os.path.join(root, filename), 'r') as file:
                        for line in file:
                                data = [int(x.strip()) for x in line.split(',')]
                                data = [me, *data]
                                merged.append(data)

        except:
                pass


# Sort by timestamp (the second element)
# take second element for sort
def takeSecond(elem):
    return elem[1]

merged.sort(key=takeSecond)

# for m in merged:
#       print(m)

single = []
curr = 0

# merge the data
for (me, time, value) in merged:
        # check now much this changes
        old = counters[me]
        change = value - old
        counters[me] = value

        # add change to the current
        curr = curr + change
        single.append( (time, curr) )

        pass

#print
for t, v in single:
        print([t, v])