Parse output of perf script

parse_perf_script.py

# usage: python this.py <(perf script -i perf.data -F comm,tid,time,ip,sym,cpu,event)

import fileinput

proc_sample_total = 0
cpu_inc = {}
cpu_ext = {}

comm = '<your-process-name>'[:15].lower()
interested = True
expect_header = True
top_of_frame = False

for input_line in fileinput.input():
    line = input_line.strip()

    if len(line) == 0:
        interested = True
        expect_header = True
        continue

    if expect_header:
        interested = line.lower().startswith(comm)
        if interested:
            proc_sample_total += 1
        expect_header = False
        top_of_frame = True
        continue

    if interested:
        segments = line.split()
        
        if segments[1] == '[unknown]':
            top_of_frame = False
            continue

        signature = '_'.join(segments[1:])
        cpu_inc.setdefault(signature, 0)
        cpu_inc[signature] += 1
        if top_of_frame:
            cpu_ext.setdefault(signature, 0)
            cpu_ext[signature] += 1
            top_of_frame = False


def stats(x):
    items = sorted(x.items(), key=lambda x: x[1], reverse=True)
    for item in items:
        print(' - {}: {:.3f}'.format(item[0], 100.0 * item[1] / proc_sample_total))
    print('')

print('Inclusion %:')
stats(cpu_inc)
print('Exclusion %:')
stats(cpu_ext)