Framework: Perf stat capturing

Change-Id: I3bbe1fe0073ddeead5219993675f24955e8c3dfd
Signed-off-by: Peter Mikus <pmikus@cisco.com>

2 files changed, 67 insertions, 2 deletions

diff --git a/resources/libraries/python/Constants.py b/resources/libraries/python/Constants.py
index a743593387..d1cd45c9fe 100644
--- a/resources/libraries/python/Constants.py
+++ b/resources/libraries/python/Constants.py
@@ -210,6 +210,9 @@ class Constants:
     # Core dump directory
     CORE_DUMP_DIR = u"/tmp"
 
+    # Perf stat events (comma separated).
+    PERF_STAT_EVENTS = u"machine_clears.smc"
+
     # Equivalent to ~0 used in vpp code
     BITWISE_NON_ZERO = 0xffffffff
 
@@ -226,8 +229,10 @@ class Constants:
     PERF_TRIAL_LATENCY_DURATION = get_float_from_env(
         u"PERF_TRIAL_LATENCY_DURATION", 5.0)
 
-    # VPP packet trace
-    PKT_TRACE = get_pessimistic_bool_from_env(u"PKT_TRACE")
+    # Extended debug (incl. vpp packet trace, linux perf stat, ...).
+    # Full list is available as suite variable (__init__.robot) or is
+    # override by test.
+    EXTENDED_DEBUG = get_pessimistic_bool_from_env(u"EXTENDED_DEBUG")
 
     # UUID string of DUT1 /tmp volume created outside of the
     # DUT1 docker in case of vpp-device test. ${EMPTY} value means that
diff --git a/resources/libraries/python/PerfUtil.py b/resources/libraries/python/PerfUtil.py
new file mode 100644
index 0000000000..51832dee48
--- /dev/null
+++ b/resources/libraries/python/PerfUtil.py
@@ -0,0 +1,60 @@
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Linux perf utility."""
+
+from resources.libraries.python.Constants import Constants
+from resources.libraries.python.ssh import exec_cmd
+from resources.libraries.python.topology import NodeType
+
+__all__ = [u"PerfUtil"]
+
+
+class PerfUtil:
+    """Class contains methods for perf utility."""
+
+    @staticmethod
+    def perf_stat(node, cpu_list=None, duration=1):
+        """Get perf stat read for duration.
+
+        :param node: Node in the topology.
+        :param cpu_list: CPU List.
+        :param duration: Measure time in seconds.
+        :type node: dict
+        :type cpu_list: str
+        :type duration: int
+        """
+        cpu = cpu_list if cpu_list else u"0-$(($(nproc) - 1))"
+        command = (
+            u"perf stat"
+            f" --cpu {cpu} --no-aggr"
+            f" --event '{{{Constants.PERF_STAT_EVENTS}}}'"
+            f" --interval-print 1000 "
+            f" -- sleep {int(duration)}"
+        )
+        exec_cmd(node, command, sudo=True)
+
+    @staticmethod
+    def perf_stat_on_all_duts(nodes, cpu_list=None, duration=1):
+        """Get perf stat read for duration on all DUTs.
+
+        :param nodes: Nodes in the topology.
+        :param cpu_list: CPU List.
+        :param duration: Measure time in seconds.
+        :type nodes: dict
+        :type cpu_list: str
+        :type duration: int
+        """
+        for node in nodes.values():
+            if node[u"type"] == NodeType.DUT:
+                PerfUtil.perf_stat(node, cpu_list=cpu_list, duration=duration)