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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749646745; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LwJkJnDs4orokssv+leEWMiYNnMVBZdqAyheL9PDKjs=; b=GPfESLvR+cU5uXD6yEtHJVg0fk75SddEesxIu2eVGlLKyvCTtWip3aRVvQg/Ryu8s1jc+4 lP5Z8fE6k/URH4JSvA0FWsTf1Y/aVAzauyT6+8HeRoMnwxDDw1ScLMRGs9pvUea2lO1Oef uvEFQYo/Uu66EBeXabT2XXKnRSgFJSs= X-MC-Unique: PLg6Ifm5M4ebdswyh9nw7g-1 X-Mimecast-MFC-AGG-ID: PLg6Ifm5M4ebdswyh9nw7g_1749646743 From: Thomas Huth To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Alexandr Moshkov Subject: [PULL 06/10] tests/functional: add memlock tests Date: Wed, 11 Jun 2025 14:58:42 +0200 Message-ID: <20250611125846.125918-7-thuth@redhat.com> In-Reply-To: <20250611125846.125918-1-thuth@redhat.com> References: <20250611125846.125918-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Alexandr Moshkov Add new tests to check the correctness of the `-overcommit memlock` option (possible values: off, on, on-fault) by using `/proc/{qemu_pid}/status` file to check in VmSize, VmRSS and VmLck values: * if `memlock=3Doff`, then VmLck =3D 0; * if `memlock=3Don`, then VmLck > 0 and almost all memory is resident; * if `memlock=3Don-fault`, then VmLck > 0 and only few memory is resident. Signed-off-by: Alexandr Moshkov Message-ID: <20250605065908.299979-3-dtalexundeer@yandex-team.ru> Signed-off-by: Thomas Huth --- tests/functional/meson.build | 1 + tests/functional/test_memlock.py | 79 ++++++++++++++++++++++++++++++++ 2 files changed, 80 insertions(+) create mode 100755 tests/functional/test_memlock.py diff --git a/tests/functional/meson.build b/tests/functional/meson.build index 557d59ddf4d..c3fca446cff 100644 --- a/tests/functional/meson.build +++ b/tests/functional/meson.build @@ -312,6 +312,7 @@ tests_x86_64_system_quick =3D [ 'virtio_version', 'x86_cpu_model_versions', 'vnc', + 'memlock', ] =20 tests_x86_64_system_thorough =3D [ diff --git a/tests/functional/test_memlock.py b/tests/functional/test_memlo= ck.py new file mode 100755 index 00000000000..2b515ff979f --- /dev/null +++ b/tests/functional/test_memlock.py @@ -0,0 +1,79 @@ +#!/usr/bin/env python3 +# +# Functional test that check overcommit memlock options +# +# Copyright (c) Yandex Technologies LLC, 2025 +# +# Author: +# Alexandr Moshkov +# +# 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 =3D 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=3D{memlock}') + self.vm.launch() + + def test_memlock_off(self): + self.common_vm_setup_with_memlock('off') + + status =3D self.get_process_status_values(self.vm.get_pid()) + + self.assertTrue(status['VmLck'] =3D=3D 0) + + def test_memlock_on(self): + self.common_vm_setup_with_memlock('on') + + status =3D 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'] >=3D status['VmSize'] * 0.70) + + def test_memlock_onfault(self): + self.common_vm_setup_with_memlock('on-fault') + + status =3D 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'] <=3D status['VmSize'] * 0.30) + + def get_process_status_values(self, pid: int) -> Dict[str, int]: + result =3D {} + raw_status =3D self._get_raw_process_status(pid) + + for line in raw_status.split('\n'): + if m :=3D STATUS_VALUE_PATTERN.match(line): + result[m.group(1)] =3D 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__ =3D=3D '__main__': + MemlockTest.main() --=20 2.49.0