1 files changed, 46 insertions, 0 deletions

diff --git a/meta/lib/oeqa/buildperf/base.py b/meta/lib/oeqa/buildperf/base.py
new file mode 100644
index 0000000000..3cbdfa7818
--- /dev/null
+++ b/meta/lib/oeqa/buildperf/base.py
@@ -0,0 +1,46 @@
+# Copyright (c) 2016, Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+"""Build performance test base classes and functionality"""
+from oeqa.utils.commands import runCmd
+
+
+class KernelDropCaches(object):
+    """Container of the functions for dropping kernel caches"""
+    sudo_passwd = None
+
+    @classmethod
+    def check(cls):
+        """Check permssions for dropping kernel caches"""
+        from getpass import getpass
+        from locale import getdefaultlocale
+        cmd = ['sudo', '-k', '-n', 'tee', '/proc/sys/vm/drop_caches']
+        ret = runCmd(cmd, ignore_status=True, data=b'0')
+        if ret.output.startswith('sudo:'):
+            pass_str = getpass(
+                "\nThe script requires sudo access to drop caches between "
+                "builds (echo 3 > /proc/sys/vm/drop_caches).\n"
+                "Please enter your sudo password: ")
+            cls.sudo_passwd = bytes(pass_str, getdefaultlocale()[1])
+
+    @classmethod
+    def drop(cls):
+        """Drop kernel caches"""
+        cmd = ['sudo', '-k']
+        if cls.sudo_passwd:
+            cmd.append('-S')
+            input_data = cls.sudo_passwd + b'\n'
+        else:
+            cmd.append('-n')
+            input_data = b''
+        cmd += ['tee', '/proc/sys/vm/drop_caches']
+        input_data += b'3'
+        runCmd(cmd, data=input_data)