perf_counter result does not count system sleep time in Mac OS

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-07-15.12:43:19.496>
labels = ['OS-mac', 'type-bug', '3.8', '3.9', '3.10']
title = 'perf_counter result does not count system sleep time in Mac OS'
updated_at = <Date 2020-08-07.16:29:12.431>
user = 'https://bugs.python.org/nooB'

bugs.python.org fields:

activity = <Date 2020-08-07.16:29:12.431>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['macOS']
creation = <Date 2020-07-15.12:43:19.496>
creator = 'nooB'
dependencies = []
files = []
hgrepos = []
issue_num = 41303
keywords = ['patch']
message_count = 20.0
messages = ['373690', '374523', '374765', '374840', '374852', '374853', '374854', '374888', '374890', '374892', '374897', '374923', '374925', '374935', '374936', '374937', '374938', '374940', '374972', '375011']
nosy_count = 10.0
nosy_names = ['ronaldoussoren', 'belopolsky', 'vstinner', 'ned.deily', 'njs', 'jab', 'nooB', 'eryksun', 'p-ganssle', 'xrisk']
pr_nums = ['21719']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41303'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']