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#!/usr/bin/env python3
#
# Functional test that check overcommit memlock options
#
# Copyright (c) Yandex Technologies LLC, 2025
#
# Author:
# Alexandr Moshkov <dtalexundeer@yandex-team.ru>
#
# SPDX-License-Identifier: GPL-2.0-or-later
import re
from typing import Dict
from qemu_test import QemuSystemTest
from qemu_test import skipLockedMemoryTest
STATUS_VALUE_PATTERN = re.compile(r'^(\w+):\s+(\d+) kB', re.MULTILINE)
@skipLockedMemoryTest(2_097_152) # 2GB
class MemlockTest(QemuSystemTest):
"""
Runs a guest with memlock options.
Then verify, that this options is working correctly
by checking the status file of the QEMU process.
"""
def common_vm_setup_with_memlock(self, memlock):
self.vm.add_args('-overcommit', f'mem-lock={memlock}')
self.vm.launch()
def test_memlock_off(self):
self.common_vm_setup_with_memlock('off')
status = self.get_process_status_values(self.vm.get_pid())
self.assertTrue(status['VmLck'] == 0)
def test_memlock_on(self):
self.common_vm_setup_with_memlock('on')
status = self.get_process_status_values(self.vm.get_pid())
# VmLck > 0 kB and almost all memory is resident
self.assertTrue(status['VmLck'] > 0)
self.assertTrue(status['VmRSS'] >= status['VmSize'] * 0.70)
def test_memlock_onfault(self):
self.common_vm_setup_with_memlock('on-fault')
status = self.get_process_status_values(self.vm.get_pid())
# VmLck > 0 kB and only few memory is resident
self.assertTrue(status['VmLck'] > 0)
self.assertTrue(status['VmRSS'] <= status['VmSize'] * 0.30)
def get_process_status_values(self, pid: int) -> Dict[str, int]:
result = {}
raw_status = self._get_raw_process_status(pid)
for line in raw_status.split('\n'):
if m := STATUS_VALUE_PATTERN.match(line):
result[m.group(1)] = int(m.group(2))
return result
def _get_raw_process_status(self, pid: int) -> str:
try:
with open(f'/proc/{pid}/status', 'r') as f:
return f.read()
except FileNotFoundError:
self.skipTest("Can't open status file of the process")
if __name__ == '__main__':
MemlockTest.main()
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