+# 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)
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