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Markus Lehtonen cee685ca0d 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>

2016-07-01 16:22:46 +01:00

2.2 KiB

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#!/usr/bin/python3

Build performance test script

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 script""" import argparse import logging import os 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

Set-up logging

LOG_FORMAT = '[%(asctime)s] %(levelname)s: %(message)s' logging.basicConfig(level=logging.INFO, format=LOG_FORMAT) log = logging.getLogger()

def pre_run_sanity_check(): """Sanity check of build environment""" build_dir = os.environ.get("BUILDDIR") if not build_dir: log.error("BUILDDIR not set. Please run the build environmnent setup " "script.") return False if os.getcwd() != build_dir: log.error("Please run this script under BUILDDIR (%s)", build_dir) return False

ret = runCmd('which bitbake', ignore_status=True)
if ret.status:
    log.error("bitbake command not found")
    return False

return True

def parse_args(argv): """Parse command line arguments""" parser = argparse.ArgumentParser( formatter_class=argparse.ArgumentDefaultsHelpFormatter)

parser.add_argument('-D', '--debug', action='store_true',
                    help='Enable debug level logging')

return parser.parse_args(argv)

def main(argv=None): """Script entry point""" args = parse_args(argv)

if args.debug:
    log.setLevel(logging.DEBUG)

if not pre_run_sanity_check():
    return 1

# Check our capability to drop caches and ask pass if needed
KernelDropCaches.check()

return 0

if name == 'main': sys.exit(main())

2.2 KiB Executable File Raw Blame History