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# 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)
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