add case for period config of memballoon

    VIRT-299028: Period config of memory balloon
Signed-off-by: nanli <[email protected]>

libvirt/tests/cfg/memory/memory_balloon/period_config_of_memory_balloon.cfg

@@ -0,0 +1,33 @@
+- memory.balloon.period:
+    type = period_config_of_memory_balloon
+    start_vm = no
+    mem_unit = "KiB"
+    current_mem_unit = "KiB"
+    current_mem = "2097152"
+    mem_value = "2097152"
+    mem_operation = "swapoff -a; dd if=/dev/zero of=/tmp/temp bs=1024K count=10; memhog -r5 500M"
+    variants:
+        - virtio_model:
+            memballoon_model = "virtio"
+        - virtio_trans_model:
+            memballoon_model = "virtio-transitional"
+        - virtio_non_trans_model:
+            memballoon_model = "virtio-non-transitional"
+    variants:
+        - undefined_period:
+            period_value_1 = "undefined"
+            period_attr = ""
+            xpath = [{'element_attrs': [".//memballoon/stats"]}]
+            xpath_ignore = True
+            period_value_2 = "0"
+            period_cmd = "--period ${period_value_2}"
+        - int_period:
+            period_value_1 = "2"
+            period_attr = ",'stats_period':'${period_value_1}'"
+            xpath = [{'element_attrs': [".//stats[@period='${period_value_1}']"]}]
+            period_value_2 = "0"
+            period_cmd = "--period ${period_value_2}"
+    device_dict = "{'model':'${memballoon_model}' ${period_attr}}"
+    variants:
+        - memory_allocation:
+            mem_attrs = {'memory_unit':'${mem_unit}','memory':${mem_value},'current_mem':${current_mem},'current_mem_unit':'${current_mem_unit}'}

libvirt/tests/src/memory/memory_balloon/period_config_of_memory_balloon.py

@@ -0,0 +1,168 @@
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright Redhat
+#
+#   SPDX-License-Identifier: GPL-2.0
+
+#   Author: Nannan Li<[email protected]>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+import re
+import time
+
+from virttest import utils_misc
+from virttest import virsh
+
+from virttest.libvirt_xml import vm_xml
+from virttest.libvirt_xml.devices import memballoon
+from virttest.utils_libvirt import libvirt_vmxml
+
+
+def run(test, params, env):
+    """
+    Verify memory statistics config "period" takes effect with various memory balloon models
+
+    Scenario:
+    1.memory balloon models: virtio, virtio-transitional, virtio-non-transitional.
+    2.period: int period, undefined.
+    3.mem config: mem, current mem.
+    """
+
+    def check_same_value(value1, value2, log_msg):
+        """
+        This function checks whether two values are same or not.
+
+        :param value1: First value to be checked.
+        :param value2: Second value to be checked.
+        :param log_msg: Log message to display in case of failure.
+        :raises: Test.Fail if values are not same.
+        """
+        if value1 != value2:
+            test.fail("The %s should not change from '%s' to '%s'"
+                      % (log_msg, value1, value2))
+
+    def get_memory_statistics():
+        """
+        Get memory statistics by virsh dommemstat
+
+        :return: usable mem, last_update, disk_caches value in result.
+        """
+        def _get_response():
+            res = virsh.dommemstat(vm_name, ignore_status=False,
+                                   debug=True).stdout_text
+            return re.findall(r'usable (\d+)', res)
+
+        if utils_misc.wait_for(_get_response, 30, 5):
+            res = virsh.dommemstat(vm_name, ignore_status=False,
+                                   debug=True).stdout_text
+            usable_mem = re.findall(r'usable (\d+)', res)[0]
+            last_update = re.findall(r'last_update (\d+)', res)[0]
+            disk_caches = re.findall(r'disk_caches (\d+)', res)[0]
+            return usable_mem, last_update, disk_caches
+        else:
+            test.fail("Not get virsh dommemstat result in 25s")
+
+    def check_vm_dommemstat(period_config, usable_mem, last_update,
+                            disk_caches):
+        """
+        Check correct vm dommemstat result.
+
+        :params: period_config: period config, undefined , 0 or number
+        :params: usable_mem, the usable mem value before consume mem
+        :params: last_update, the last update value before consume mem
+        :params: disk_caches, the disk caches value before consume mem
+        """
+        usable_mem_new, last_update_new, disk_caches_new = get_memory_statistics()
+
+        if period_config in ["undefined", "0"]:
+            check_same_value(usable_mem_new, usable_mem, "usable value")
+            check_same_value(last_update_new, last_update, "last update")
+            check_same_value(disk_caches_new, disk_caches, "disk caches")
+
+        elif period_config.isdigit() and period_config != "0":
+            if usable_mem_new == usable_mem:
+                test.fail("The usable mem should be as '%s' instead of '%s'"
+                          % (usable_mem_new, usable_mem))
+            if last_update_new <= last_update:
+                test.fail("The last update '%s' should bigger than to '%s'"
+                          % (last_update_new, last_update))
+            if disk_caches_new == disk_caches:
+                test.fail("The disk caches mem '%s' should not same as '%s' " %
+                          (disk_caches_new, disk_caches))
+
+    def run_test():
+        """
+        Define and start guest
+        Check memTotal and memory allocation
+        """
+        test.log.info("TEST_STEP1: Define guest")
+        vmxml = vm_xml.VMXML.new_from_dumpxml(vm_name)
+        vmxml.setup_attrs(**mem_attrs)
+        vmxml.del_device('memballoon', by_tag=True)
+        libvirt_vmxml.modify_vm_device(vmxml, 'memballoon', device_dict)
+
+        test.log.info("TEST_STEP2: Start guest ")
+        vm.start()
+        vm.wait_for_login().close()
+        vmxml = vm_xml.VMXML.new_from_dumpxml(vm_name)
+        test.log.debug("After start vm, get xml is:\n%s", vmxml)
+
+        test.log.info("TEST_STEP3: Check memory balloon config by virsh dumpxml")
+        if libvirt_vmxml.check_guest_xml_by_xpaths(
+                vmxml, expect_xpath, xpath_ignore) == xpath_ignore:
+            test.fail("Expect to get '%s' in xml result is  '%s'" % (expect_xpath, xpath_ignore))
+
+        test.log.info("TEST_STEP4: Get vm memory statistics by virsh dommemstat")
+        usable_mem_1, last_update_1, disk_caches_1 = get_memory_statistics()
+
+        test.log.info("TEST_STEP5: Do memory operation and check dommemstat")
+        session = vm.wait_for_login()
+        status, stdout = session.cmd_status_output(mem_operation)
+        session.close()
+        if status:
+            test.fail("Failed to consume memory:%s" % stdout)
+        check_vm_dommemstat(period_value_1, usable_mem_1, last_update_1, disk_caches_1)
+
+        test.log.info("TEST_STEP6: Change the period setting")
+        virsh.dommemstat(vm_name, period_cmd, ignore_status=False, debug=True)
+
+        test.log.info("TEST_STEP7: Repeat consume mem and check memory "
+                      "statistics step")
+        if libvirt_vmxml.check_guest_xml_by_xpaths(
+                vmxml, expect_xpath, xpath_ignore) == xpath_ignore:
+            test.fail("Expect to get '%s' in xml is '%s'" % (expect_xpath, xpath_ignore))
+
+        usable_mem_3, last_update_3, disk_caches_3 = get_memory_statistics()
+        session = vm.wait_for_login()
+        status, stdout = session.cmd_status_output(mem_operation)
+        session.close()
+        if status:
+            test.fail("Failed to consume memory:%s" % stdout)
+        check_vm_dommemstat(period_value_2, usable_mem_3, last_update_3, disk_caches_3)
+
+    def teardown_test():
+        """
+        Clean data.
+        """
+        test.log.info("TEST_TEARDOWN: Clean up env.")
+        bkxml.sync()
+
+    vm_name = params.get("main_vm")
+    vm = env.get_vm(vm_name)
+    vmxml = vm_xml.VMXML.new_from_inactive_dumpxml(vm_name)
+    bkxml = vmxml.copy()
+
+    mem_attrs = eval(params.get("mem_attrs", "{}"))
+    device_dict = eval(params.get("device_dict", "{}"))
+    mem_operation = params.get("mem_operation")
+    period_value_1 = params.get("period_value_1")
+    period_value_2 = params.get("period_value_2")
+    period_cmd = params.get("period_cmd")
+    expect_xpath = eval(params.get("xpath"))
+    xpath_ignore = bool(params.get("xpath_ignore", False))
+
+    try:
+        run_test()
+
+    finally:
+        teardown_test()