diff options
Diffstat (limited to 'catapult/systrace/systrace/util.py')
| -rw-r--r-- | catapult/systrace/systrace/util.py | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/catapult/systrace/systrace/util.py b/catapult/systrace/systrace/util.py index c9571b6f..02981458 100644 --- a/catapult/systrace/systrace/util.py +++ b/catapult/systrace/systrace/util.py @@ -52,6 +52,27 @@ def run_adb_shell(shell_args, device_serial): return (adb_output, adb_return_code) +def get_tracing_path(): + """Uses adb to attempt to determine tracing path. The newest kernel doesn't + support mounting debugfs, so the Android master uses tracefs to replace it. + + Returns: + /sys/kernel/debug/tracing for device with debugfs mount support; + /sys/kernel/tracing for device with tracefs support; + /sys/kernel/debug/tracing if support can't be determined. + """ + mount_info_args = ['mount'] + parser = OptionParserIgnoreErrors() + parser.add_option('-e', '--serial', dest='device_serial', type='string') + options, _ = parser.parse_args() + + adb_output, adb_return_code = run_adb_shell(mount_info_args, + options.device_serial) + if adb_return_code == 0 and 'debugfs' not in adb_output: + return '/sys/kernel/tracing' + return '/sys/kernel/debug/tracing' + + def get_device_sdk_version(): """Uses adb to attempt to determine the SDK version of a running device.""" |