summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMarkus Lehtonen <markus.lehtonen@linux.intel.com>2016-04-26 13:18:13 +0300
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-07-01 16:22:46 +0100
commitcee685ca0d29b022e0665fccf58de006e7ffaef1 (patch)
tree614e98c3f53374424aac37f798ecbbe24f288715
parent7d42ceae3a42f7a6580436b113c47aad37717293 (diff)
downloadopenembedded-core-contrib-cee685ca0d29b022e0665fccf58de006e7ffaef1.tar.gz
openembedded-core-contrib-cee685ca0d29b022e0665fccf58de006e7ffaef1.tar.bz2
openembedded-core-contrib-cee685ca0d29b022e0665fccf58de006e7ffaef1.zip
oeqa.buildperf: functionality to drop kernel caches
Add a new utility class for dropping Linux kernel caches. It uses sudo and tee to write to the drop_caches file. Checking if the user has the permissions to drop caches (without a password) is done by trying to writing an invalid value to the drop_caches file. This way, we will find if writing (with tee) is possible but not really dropping caches, yet. User can avoid giving the password by adding something like: <user> ALL = NOPASSWD: /usr/bin/tee /proc/sys/vm/drop_caches to the system sudoers file. (From OE-Core rev: c9cb248429ced50c96d11ba5361c272d4c9b9323) Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-rw-r--r--meta/lib/oeqa/buildperf/__init__.py1
-rw-r--r--meta/lib/oeqa/buildperf/base.py46
-rwxr-xr-xscripts/oe-build-perf-test4
3 files changed, 51 insertions, 0 deletions
diff --git a/meta/lib/oeqa/buildperf/__init__.py b/meta/lib/oeqa/buildperf/__init__.py
index c9535591e2..bab122e4ec 100644
--- a/meta/lib/oeqa/buildperf/__init__.py
+++ b/meta/lib/oeqa/buildperf/__init__.py
@@ -10,3 +10,4 @@
# more details.
#
"""Build performance tests"""
+from .base import KernelDropCaches
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)
diff --git a/scripts/oe-build-perf-test b/scripts/oe-build-perf-test
index 9fb431045b..9589dee3ac 100755
--- a/scripts/oe-build-perf-test
+++ b/scripts/oe-build-perf-test
@@ -22,6 +22,7 @@ import sys
sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)) + '/lib')
import scriptpath
scriptpath.add_oe_lib_path()
+from oeqa.buildperf import KernelDropCaches
from oeqa.utils.commands import runCmd
@@ -71,6 +72,9 @@ def main(argv=None):
if not pre_run_sanity_check():
return 1
+ # Check our capability to drop caches and ask pass if needed
+ KernelDropCaches.check()
+
return 0