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charset="utf-8" Add new tests to check the correctness of the `-overcommit memlock` option (possible values: off, on, on-fault) by using `/proc/{qemu_pid}/smaps` file to check in Size, Rss and Locked fields of anonymous segments: * if `memlock=3Doff`, then Locked =3D 0 on every anonymous smaps; * if `memlock=3Don`, then Size, Rss and Locked values must be equal for every anon smaps where Rss is not 0; * if `memlock=3Don-fault`, then Rss and Locked must be equal on every anon smaps and anonymous segment with Rss < Size must exists. Signed-off-by: Alexandr Moshkov --- tests/avocado/memlock.py | 100 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 tests/avocado/memlock.py diff --git a/tests/avocado/memlock.py b/tests/avocado/memlock.py new file mode 100644 index 0000000000..e3e98d9524 --- /dev/null +++ b/tests/avocado/memlock.py @@ -0,0 +1,100 @@ +# Functional test that check overcommit memlock options +# +# Copyright (c) Yandex Technologies LLC, 2025 +# +# Author: +# Alexandr Moshkov +# +# +# This work is licensed under the terms of the GNU GPL, version 2 or +# later. See the COPYING file in the top-level directory. + +import re + +from typing import List, Dict + +from avocado_qemu.linuxtest import LinuxTest + + +SMAPS_HEADER_PATTERN =3D re.compile(r'^\w+-\w+', re.MULTILINE) +SMAPS_VALUE_PATTERN =3D re.compile(r'^(\w+):\s+(\d+) kB', re.MULTILINE) + + +class Memlock(LinuxTest): + """ + :avocado: tags=3Dmemlock + + Boots a Linux system with memlock options. + Then verify, that this options is working correctly + by checking the smaps of the QEMU proccess. + """ + + def common_vm_setup_with_memlock(self, memlock): + self.vm.add_args('-overcommit', f'mem-lock=3D{memlock}') + self.launch_and_wait(set_up_ssh_connection=3DFalse) + + def get_anon_smaps_by_pid(self, pid): + smaps_raw =3D self._get_raw_smaps_by_pid(pid) + return self._parse_anonymous_smaps(smaps_raw) + + + def test_memlock_off(self): + self.common_vm_setup_with_memlock('off') + + anon_smaps =3D self.get_anon_smaps_by_pid(self.vm.get_pid()) + + # locked =3D 0 on every smap + for smap in anon_smaps: + self.assertEqual(smap['Locked'], 0) + + def test_memlock_on(self): + self.common_vm_setup_with_memlock('on') + + anon_smaps =3D self.get_anon_smaps_by_pid(self.vm.get_pid()) + + # size =3D rss =3D locked on every smap where rss not 0 + for smap in anon_smaps: + if smap['Rss'] =3D=3D 0: + continue + self.assertTrue(smap['Size'] =3D=3D smap['Rss'] =3D=3D smap['L= ocked']) + + def test_memlock_onfault(self): + self.common_vm_setup_with_memlock('on-fault') + + anon_smaps =3D self.get_anon_smaps_by_pid(self.vm.get_pid()) + + # rss =3D locked on every smap and segment with rss < size exists + exists =3D False + for smap in anon_smaps: + self.assertTrue(smap['Rss'] =3D=3D smap['Locked']) + if smap['Rss'] < smap['Size']: + exists =3D True + self.assertTrue(exists) + + + def _parse_anonymous_smaps(self, smaps_raw: str) -> List[Dict[str, int= ]]: + result_segments =3D [] + current_segment =3D {} + is_anonymous =3D False + + for line in smaps_raw.split('\n'): + if SMAPS_HEADER_PATTERN.match(line): + if current_segment and is_anonymous: + result_segments.append(current_segment) + current_segment =3D {} + # anonymous segment header looks like this: + # 7f3b8d3f0000-7f3b8d3f3000 rw-s 00000000 00:0f 1052 + # and non anonymous header looks like this: + # 7f3b8d3f0000-7f3b8d3f3000 rw-s 00000000 00:0f 1052 [st= ack] + is_anonymous =3D len(line.split()) =3D=3D 5 + elif m :=3D SMAPS_VALUE_PATTERN.match(line): + current_segment[m.group(1)] =3D int(m.group(2)) + + if current_segment and is_anonymous: + result_segments.append(current_segment) + + return result_segments + + def _get_raw_smaps_by_pid(self, pid: int) -> str: + with open(f'/proc/{pid}/smaps', 'r') as f: + return f.read() --=20 2.34.1