Merge remote branch 'cros/upstream' into tempbranch

client/tests/tracing_microbenchmark/tracing_microbenchmark.py

+import os
+import re
+from autotest_lib.client.bin import test
+from autotest_lib.client.bin import utils
+
+import tracers
+import base_tracer
+
+class tracing_microbenchmark(test.test):
+    version = 1
+    preserve_srcdir = True
+
+    def setup(self):
+        os.chdir(self.srcdir)
+        utils.system('make CROSS_COMPILE=""')
+
+    def initialize(self, tracer='ftrace', calls=100000, **kwargs):
+        self.job.require_gcc()
+        tracer_class = getattr(tracers, tracer)
+        if not issubclass(tracer_class, base_tracer.Tracer):
+            raise TypeError
+        self.tracer = tracer_class()
+
+        getuid_microbench = os.path.join(self.srcdir, 'getuid_microbench')
+        self.cmd = '%s %d' % (getuid_microbench, calls)
+
+    def warmup(self, buffer_size_kb=8000, **kwargs):
+        self.tracer.warmup(buffer_size_kb)
+
+    def cleanup(self):
+        self.tracer.cleanup()
+
+    def run_once(self, **kwargs):
+        self.results = {}
+
+        self.tracer.start_tracing()
+        self.cmd_result = utils.run(self.cmd)
+        self.tracer.stop_tracing()
+
+        self.tracer.gather_stats(self.results)
+        self.tracer.reset_tracing()
+
+    def postprocess_iteration(self):
+        result_re = re.compile(r'(?P<calls>\d+) calls '
+                               r'in (?P<time>\d+\.\d+) s '
+                               '\((?P<ns_per_call>\d+\.\d+) ns/call\)')
+        match = result_re.match(self.cmd_result.stdout)
+        self.results.update(match.groupdict())
+
+        self.write_perf_keyval(self.results)