| # Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """ |
| This is a profiler class for the perf profiler in ChromeOS. It differs from |
| the existing perf profiler in autotset by directly substituting the options |
| passed to the initialize function into the "perf" command line. It allows one |
| to specify which perf command to run and thus what type of profile to collect |
| (e.g. "perf record" or "perf stat"). It also does not produce a perf report |
| on the client (where there are no debug symbols) but instead copies |
| the perf.data file back to the server for analysis. |
| """ |
| |
| import os, signal, subprocess |
| from autotest_lib.client.bin import profiler, os_dep |
| from autotest_lib.client.common_lib import error |
| |
| |
| class cros_perf(profiler.profiler): |
| version = 1 |
| |
| def initialize(self, options='-e cycles', profile_type='record'): |
| # The two supported options for profile_type are 'record' and 'stat'. |
| self.options = options |
| self.perf_bin = os_dep.command('perf') |
| self.profile_type = profile_type |
| |
| |
| def start(self, test): |
| if self.profile_type == 'record': |
| # perf record allows you to specify where to place the output. |
| # perf stat does not. |
| logfile = os.path.join(test.profdir, 'perf.data') |
| self.options += ' -o %s' % logfile |
| |
| if self.profile_type == 'stat': |
| # Unfortunately we need to give perf stat a command or process even |
| # when running in system-wide mode. |
| self.options += ' -p 1' |
| |
| outfile = os.path.join(test.profdir, 'perf.out') |
| |
| cmd = ('exec %s %s -a %s > %s 2>&1' % |
| (self.perf_bin, self.profile_type, self.options, outfile)) |
| |
| self._process = subprocess.Popen(cmd, shell=True, |
| stderr=subprocess.STDOUT) |
| |
| |
| def stop(self, test): |
| ret_code = self._process.poll() |
| if ret_code is not None: |
| raise error.AutotestError('perf terminated early with return code: ' |
| '%d. Please check your logs.' % ret_code) |
| |
| self._process.send_signal(signal.SIGINT) |
| self._process.wait() |
