oe-build-perf-test: suppress logger output when tests are being run

Prevent logger from writing to stderr when the tests are being run by
the TestRunner. During this time the logger output is only written to
the log file. This way the console output from the script is cleaner and
not mixed with possible logger records.

(From OE-Core rev: 36f58b5172d4e2e182aa447fb3ec4d1ac9f6820d)

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>

scripts/oe-build-perf-test

@@ -133,10 +133,19 @@ def main(argv=None):
     out_dir = args.out_dir.format(date=datetime.now().strftime('%Y%m%d%H%M%S'))
     setup_file_logging(os.path.join(out_dir, 'output.log'))
 
-    # Run actual tests
     archive_build_conf(out_dir)
     runner = BuildPerfTestRunner(out_dir, verbosity=2)
+
+    # Suppress logger output to stderr so that the output from unittest
+    # is not mixed with occasional logger output
+    log.handlers[0].setLevel(logging.CRITICAL)
+
+    # Run actual tests
     result = runner.run(suite)
+
+    # Restore logger output to stderr
+    log.handlers[0].setLevel(log.level)
+
     if result.wasSuccessful():
         if args.globalres_file:
             result.update_globalres_file(args.globalres_file)