Add rt-app calibration logging

Test the calibration using a script like that:

Can be invoked using e.g.

python3 testcalib.py --conf target_conf.yml

See --help for more ways of specifying the target.

#! /usr/bin/env python3
import itertools
from pathlib import Path
import datetime
import tempfile
import json

from lisa.target import Target
from lisa.wlgen.rta import RTA
from lisa.trace import FtraceCollector


base = Path('rtapp_calibration_logs')
base.mkdir(parents=True, exist_ok=True)


events = ['sched_switch', 'sched_wakeup', 'sched_wakeup_new', 'sched_waking', 'sched_pelt_se', 'sched_pelt_cfs']

target = Target.from_cli()

def calibrate(i):

    prefix = f'#{i}-{datetime.datetime.now()}-'
    res_dir = Path(tempfile.mkdtemp(dir=base, prefix=prefix))
    trace_path = res_dir / 'trace.dat'

    coll = FtraceCollector(target=target, output_path=trace_path, events=events)
    with coll:
        calib = RTA.get_cpu_calibrations(target, res_dir=res_dir)

    with open(res_dir / 'calib.json', 'w') as f:
        json.dump(calib, f)

    return calib

def main():
    for i in itertools.count():
        print('#'*80 + '\n')
        print(f'Starting calibration #{i}')
        calib = calibrate(i)
        pretty = ", ".join(f'{cpu}={calib}' for cpu, calib in sorted(calib.items()))
        print(f'Finished calibration #{i}: {pretty}')
        print('\n\n')

main()