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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 /meta/lib
parent7d42ceae3a42f7a6580436b113c47aad37717293 (diff)
downloadpoky-cee685ca0d29b022e0665fccf58de006e7ffaef1.tar.gz
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>
Diffstat (limited to 'meta/lib')
-rw-r--r--meta/lib/oeqa/buildperf/__init__.py1
-rw-r--r--meta/lib/oeqa/buildperf/base.py46
2 files changed, 47 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 @@
10# more details. 10# more details.
11# 11#
12"""Build performance tests""" 12"""Build performance tests"""
13from .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 @@
1# Copyright (c) 2016, Intel Corporation.
2#
3# This program is free software; you can redistribute it and/or modify it
4# under the terms and conditions of the GNU General Public License,
5# version 2, as published by the Free Software Foundation.
6#
7# This program is distributed in the hope it will be useful, but WITHOUT
8# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
9# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
10# more details.
11#
12"""Build performance test base classes and functionality"""
13from oeqa.utils.commands import runCmd
14
15
16class KernelDropCaches(object):
17 """Container of the functions for dropping kernel caches"""
18 sudo_passwd = None
19
20 @classmethod
21 def check(cls):
22 """Check permssions for dropping kernel caches"""
23 from getpass import getpass
24 from locale import getdefaultlocale
25 cmd = ['sudo', '-k', '-n', 'tee', '/proc/sys/vm/drop_caches']
26 ret = runCmd(cmd, ignore_status=True, data=b'0')
27 if ret.output.startswith('sudo:'):
28 pass_str = getpass(
29 "\nThe script requires sudo access to drop caches between "
30 "builds (echo 3 > /proc/sys/vm/drop_caches).\n"
31 "Please enter your sudo password: ")
32 cls.sudo_passwd = bytes(pass_str, getdefaultlocale()[1])
33
34 @classmethod
35 def drop(cls):
36 """Drop kernel caches"""
37 cmd = ['sudo', '-k']
38 if cls.sudo_passwd:
39 cmd.append('-S')
40 input_data = cls.sudo_passwd + b'\n'
41 else:
42 cmd.append('-n')
43 input_data = b''
44 cmd += ['tee', '/proc/sys/vm/drop_caches']
45 input_data += b'3'
46 runCmd(cmd, data=input_data)