path: root/scripts
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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 16:08:49 +0100
commitc9cb248429ced50c96d11ba5361c272d4c9b9323 (patch)
tree3bdc4db4749df92b486e9ca20a6f2f93283baa89 /scripts
parentb44af9051a9da8d2cddc7b071a896331967f15cc (diff)
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. Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
Diffstat (limited to 'scripts')
1 files changed, 4 insertions, 0 deletions
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
+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