[Qemu-devel] [RFC 16/24] avocado_qemu: Functional test for RHBZ1473203

[Eduardo Habkost <ehabkost@redhat.com>]

From: Lukáš Doktor <ldoktor@redhat.com>

Adds regresion test for RHBZ1473203 which runs VM with 16 numa nodes and
then verifies memory allocation is accurate before and after hotplugging
memory into default and 13th node.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 tests/avocado/test_numa_hotplug.py | 116 +++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 tests/avocado/test_numa_hotplug.py

diff --git a/tests/avocado/test_numa_hotplug.py b/tests/avocado/test_numa_hotplug.py
new file mode 100644
index 0000000000..a99b8dcebf
--- /dev/null
+++ b/tests/avocado/test_numa_hotplug.py
@@ -0,0 +1,116 @@
+import re
+import time
+
+from avocado_qemu import test
+
+
+class TestNumaHotplug(test.QemuTest):
+    """
+    Verifies that "info numa" and "/sys/devices/system/node/" contains
+    correct values before/after inserting memory devices into default
+    and then into 13th numa node.
+
+    Associated bug trackers: RHBZ1473203
+        https://bugzilla.redhat.com/show_bug.cgi?id=1473203
+
+    Fixed in kernel commit dc421b200f91930c9c6a9586810ff8c232cf10fc.
+
+    :avocado: enable
+    :avocado: tags=RHBZ1473203,requires_linux,numa,memory,ppc64le
+    """
+
+    def setUp(self):
+        self.request_image()
+        self.vm.args.extend(["-m", "4G,slots=208,maxmem=80G"])
+        self.vm.args.extend(["-numa", "node"] * 16)
+        self.vm.launch()
+
+    def check_mem_console(self, console, exp):
+        """
+        Verifies that memory layout is according to exp using console/ssh
+
+        :param console: session
+        :param exp: list of MemTotals per node in MB, tolerance is +-100MB
+        """
+        out = console.cmd_output_safe("echo /sys/devices/system/node/node*")
+        nodes = re.findall(r"/sys/devices/system/node/node\d+", out)
+        self.assertEqual(len(nodes), len(exp), "Number of nodes is not "
+                         "%s:\n%s" % (len(exp), out))
+        for i in xrange(len(exp)):
+            out = console.cmd_output_safe("cat /sys/devices/system/node/"
+                                          "node%s/meminfo" % i)
+            mem = re.search(r"MemTotal:\s*(\d+) kB", out)
+            self.assertTrue(mem, "Failed to obtain node%s MemTotal:\n%s"
+                            % (i, out))
+            _exp = exp[i] * 1024
+            mem = int(mem.group(1))
+            self.assertGreater(mem, _exp - 102400, "TotalMem of node%s is not "
+                               "%s+-51200 kb (%s)" % (i, _exp, mem))
+            self.assertLess(mem, _exp + 102400, "TotalMem of node%s is not "
+                            "%s+-51200 kb (%s)" % (i, _exp, mem))
+
+    def check_mem_monitor(self, monitor, exp):
+        """
+        Verifies that memory layout is according to exp using QMP monitor
+
+        :param console: session
+        :param exp: list of MemTotals per node in MB, tolerance is +-100MB
+        """
+        ret = monitor("human-monitor-command", command_line="info numa")
+        out = ret["return"]
+        self.assertTrue(out.startswith("%s nodes" % len(exp)), "Number of "
+                        "nodes is not %s:\n%s" % (len(exp), out))
+        for i in xrange(len(exp)):
+            _exp = "node %s size: %s MB" % (i, exp[i])
+            self.assertIn(_exp, out, "%s is not in 'info numa' output, "
+                          "probably wrong memory size reported:\n%s"
+                          % (_exp, out))
+
+    @staticmethod
+    def _retry_until_timeout(timeout, func, *args, **kwargs):
+        """
+        Repeat the function until it returns anything ignoring AssertionError.
+        After the deadline repeate the function one more time without ignoring
+        timeout.
+        """
+        end = time.time() + timeout
+        while time.time() < end:
+            try:
+                ret = func(*args, **kwargs)
+            except AssertionError:
+                continue
+            break
+        else:
+            ret = func(*args, **kwargs)
+        return ret
+
+    def test_hotplug_mem_into_node(self):
+        console = self.vm.get_console()
+        exp = [256] * 16
+        self.check_mem_monitor(self.vm.qmp, exp)
+        self.check_mem_console(console, exp)
+        cmd = "object_add memory-backend-ram,id=mem2,size=1G"
+        res = self.vm.qmp("human-monitor-command", command_line=cmd)
+        self.assertEqual(res["return"], "")
+        cmd = "device_add pc-dimm,id=dimm2,memdev=mem2"
+        res = self.vm.qmp("human-monitor-command", command_line=cmd)
+        self.assertEqual(res["return"], "")
+        exp = [1280] + [256] * 15
+        self.check_mem_monitor(self.vm.qmp, exp)
+        # Wait up to 10s to propagate the changes
+        self._retry_until_timeout(10, self.check_mem_console, console, exp)
+        cmd = "object_add memory-backend-ram,id=mem8,size=1G"
+        res = self.vm.qmp("human-monitor-command", command_line=cmd)
+        self.assertEqual(res["return"], "")
+        cmd = "device_add pc-dimm,id=dimm8,memdev=mem8,node=13"
+        res = self.vm.qmp("human-monitor-command", command_line=cmd)
+        self.assertEqual(res["return"], "")
+        time.sleep(5)
+        exp = [1280] + [256] * 12 + [1280] + [256] * 2
+        self.check_mem_monitor(self.vm.qmp, exp)
+        # Wait up to 10s to propagate the changes
+        self._retry_until_timeout(10, self.check_mem_console, console, exp)
+        console.close()
+
+    def tearDown(self):
+        self.vm.shutdown()
-- 
2.14.3