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# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Tracing agent that captures cgroup information from /dev/cpuset on
# an Android device.
import stat
import py_utils
from devil.android import device_utils
from systrace import tracing_agents
from systrace import trace_result
# identify this as trace of cgroup state
# for now fake it as trace as no importer supports it
TRACE_HEADER = '# tracer: \nCGROUP DUMP\n'
def add_options(parser): # pylint: disable=unused-argument
return None
def try_create_agent(config):
if config.target != 'android':
return None
if not config.atrace_categories:
return None
# 'sched' contains cgroup events
if 'sched' not in config.atrace_categories:
return None
if config.from_file is not None:
return None
return AndroidCgroupAgent()
def get_config(options):
return options
def parse_proc_cgroups(cgroups, subsys):
for line in cgroups.split('\n'):
if line.startswith(subsys):
return line.split()[1]
return '-1'
class AndroidCgroupAgent(tracing_agents.TracingAgent):
def __init__(self):
super(AndroidCgroupAgent, self).__init__()
self._config = None
self._device_utils = None
self._trace_data = ""
def __repr__(self):
return 'cgroup_data'
@py_utils.Timeout(tracing_agents.START_STOP_TIMEOUT)
def StartAgentTracing(self, config, timeout=None):
self._config = config
self._device_utils = device_utils.DeviceUtils(
self._config.device_serial_number)
if not self._device_utils.HasRoot():
return False
self._trace_data += self._get_cgroup_info()
return True
@py_utils.Timeout(tracing_agents.START_STOP_TIMEOUT)
def StopAgentTracing(self, timeout=None):
return True
@py_utils.Timeout(tracing_agents.GET_RESULTS_TIMEOUT)
def GetResults(self, timeout=None):
result = TRACE_HEADER + self._trace_data
return trace_result.TraceResult('cgroupDump', result)
def SupportsExplicitClockSync(self):
return False
def RecordClockSyncMarker(self, sync_id, did_record_sync_marker_callback):
pass
def _get_cgroup_info(self):
data = []
CGROUP_SUBSYS = 'cpuset'
CGROUP_ROOT = '/dev/cpuset/'
cgroups = self._device_utils.ReadFile('/proc/cgroups')
header = '# cgroup task attachment\n'
root_id = parse_proc_cgroups(cgroups, CGROUP_SUBSYS)
for cgrp in self._device_utils.StatDirectory(CGROUP_ROOT):
if not stat.S_ISDIR(cgrp['st_mode']):
continue
tasks_file = CGROUP_ROOT + cgrp['filename'] + '/tasks'
tasks = self._device_utils.ReadFile(tasks_file).split('\n')
cgrp_info = '/%s (root=%s) : ' % (cgrp['filename'], root_id)
data.append(cgrp_info + ' '.join(tasks))
return cgroups + header + '\n'.join(data) + '\n'
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