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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-only
#
# Test to replace idle_thread of scope unit using cgexec -r
#
# Copyright (c) 2023 Oracle and/or its affiliates.
# Author: Kamalesh Babulal <kamalesh.babulal@oracle.com>
#
from multiprocessing import active_children
from process import Process
from cgroup import Cgroup
from run import RunError
import consts
import ftests
import time
import sys
import os
CONTROLLER = 'cpu'
SLICE = 'libcgroup.slice'
CGNAME = os.path.join(SLICE, '085cgcreate.scope')
OUT_OF_SCOPE_CGNAME1 = '085outofscope'
OUT_OF_SCOPE_CGNAME2 = '085outofscope.scope'
def prereqs(config):
result = consts.TEST_PASSED
cause = None
if config.args.container:
result = consts.TEST_SKIPPED
cause = 'This test cannot be run within a container'
return result, cause
def setup(config):
pass
def test(config):
result = consts.TEST_PASSED
cause = None
Cgroup.create_and_validate(config, CONTROLLER, CGNAME, create_scope=True)
#
# Test 1: call cgexec -r to replace idle_thread with infinite while loop
#
idle_pid = Cgroup.get_pids_in_cgroup(config, CGNAME, CONTROLLER)[0]
config.process.create_process_in_cgroup(config, CONTROLLER, CGNAME, cgclassify=False,
replace_idle=True)
# We need pause, before the cgroups.procs gets updated, post cgexec
time.sleep(1)
pid = Cgroup.get_pids_in_cgroup(config, CGNAME, CONTROLLER)[0]
if idle_pid == pid:
result = consts.TEST_FAILED
cause = 'Failed to replace scope idle_thread pid {} {}'.format(idle_pid, pid)
return result, cause
#
# Test 2: call cgexec -r to replace non-idle_thread (while loop,
# previously created) with another while loop. It's expected to fail,
# because only idle_thread is allowed to be replaced.
#
config.process.create_process_in_cgroup(config, CONTROLLER, CGNAME,
cgclassify=False, replace_idle=True)
# We need pause, before the cgroups.procs gets updated, post cgexec
time.sleep(1)
replace_pid = Cgroup.get_pids_in_cgroup(config, CGNAME, CONTROLLER)[0]
if replace_pid != pid:
result = consts.TEST_FAILED
cause = ('Erroneously replaced scope non idle_thread pid {} with '
'pid {}'.format(pid, replace_pid))
return result, cause
#
# Test 3: create a non-scope cgroup, try creating a task with replace_idle
# set. It should fail way before creating a task, during cgroup name
# check.
Cgroup.create_and_validate(config, CONTROLLER, OUT_OF_SCOPE_CGNAME1)
config.process.create_process_in_cgroup(config, CONTROLLER, OUT_OF_SCOPE_CGNAME1,
cgclassify=False, replace_idle=True)
# We need pause, before the cgroups.procs gets updated, post cgexec
time.sleep(1)
pid = Cgroup.get_pids_in_cgroup(config, OUT_OF_SCOPE_CGNAME1, CONTROLLER)
if len(pid) != 0:
result = consts.TEST_FAILED
cause = ('Erroneously succeeded in creating task in non scope cgroup: '
'pid {}'.format(pid))
return result, cause
#
# Test 4: create a non-scope cgroup with .scope suffix, try creating a task with
# replace_idle set. It should fail when trying to find idle_task
# check.
#
Cgroup.create_and_validate(config, CONTROLLER, OUT_OF_SCOPE_CGNAME2)
config.process.create_process_in_cgroup(config, CONTROLLER, OUT_OF_SCOPE_CGNAME2,
cgclassify=False, replace_idle=True)
# We need pause, before the cgroups.procs gets updated, post cgexec
time.sleep(1)
pid = Cgroup.get_pids_in_cgroup(config, OUT_OF_SCOPE_CGNAME2, CONTROLLER)
if len(pid) != 0:
result = consts.TEST_FAILED
cause = ('Erroneously succeeded in creating task in non scope cgroup: '
'pid {}'.format(pid))
return result, cause
def teardown(config):
Cgroup.delete(config, CONTROLLER, OUT_OF_SCOPE_CGNAME1)
Cgroup.delete(config, CONTROLLER, OUT_OF_SCOPE_CGNAME2)
pid = Cgroup.get_pids_in_cgroup(config, CGNAME, CONTROLLER)
Process.kill(config, pid)
# kill the process, that was created by us but failed to migrate to the cgroup
active = active_children()
active[0].terminate()
# systemd will automatically remove the cgroup once there are no more pids in
# the cgroup, so we don't need to delete CGNAME. But let's try to remove the
# slice
try:
Cgroup.delete(config, CONTROLLER, SLICE)
except RunError:
pass
def main(config):
[result, cause] = prereqs(config)
if result != consts.TEST_PASSED:
return [result, cause]
setup(config)
[result, cause] = test(config)
teardown(config)
return [result, cause]
if __name__ == '__main__':
config = ftests.parse_args()
# this test was invoked directly. run only it
config.args.num = int(os.path.basename(__file__).split('-')[0])
sys.exit(ftests.main(config))
# vim: set et ts=4 sw=4:
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