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https://github.com/ARM-software/workload-automation.git
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Adding a generic trace-cmd paraser.
This commit is contained in:
Sergei Trofimov
232
wlauto/utils/trace_cmd.py
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232
wlauto/utils/trace_cmd.py
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# Copyright 2015 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import re
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import logging
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from wlauto.utils.misc import isiterable
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from wlauto.utils.types import numeric
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logger = logging.getLogger('trace-cmd')
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# These markers can be injected into trace to identify the "interesting"
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# portion.
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TRACE_MARKER_START = 'TRACE_MARKER_START'
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TRACE_MARKER_STOP = 'TRACE_MARKER_STOP'
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class TraceCmdEvent(object):
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"""
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A single trace-cmd event. This will appear in the trace cmd report in the format
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<idle>-0 [000] 3284.126993: sched_rq_runnable_load: cpu=0 load=54
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| | | | |___________|
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thread cpu timestamp name body
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"""
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__slots__ = ['thread', 'reporting_cpu_id', 'timestamp', 'name', 'text', 'fields']
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def __init__(self, thread, cpu_id, ts, name, body, parser=None):
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"""
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parameters:
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:thread: thread which generated the event
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:cpu: cpu on which the event has occurred
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:ts: timestamp of the event
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:name: the name of the event
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:bodytext: a string with the rest of the event text
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:parser: optionally, a function that will parse bodytext to populate
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this event's attributes
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The parser can be any callable that can be invoked with
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parser(event, text)
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Where ``event`` is this TraceCmdEvent instance, and ``text`` is the body text to be
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parsed. The parser should updated the passed event instance and not return anything
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(the return value will be ignored). Any exceptions raised by the parser will be silently
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ignored (note that this means that the event's attributes may be partially initialized).
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"""
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self.thread = thread
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self.reporting_cpu_id = int(cpu_id)
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self.timestamp = numeric(ts)
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self.name = name
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self.text = body
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self.fields = {}
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if parser:
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try:
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parser(self, self.text)
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except Exception: # pylint: disable=broad-except
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# unknown format assume user does not care or know how to
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# parse self.text
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pass
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def __getattr__(self, name):
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try:
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return self.fields[name]
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except KeyError:
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raise AttributeError(name)
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def __str__(self):
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return 'TE({} @ {})'.format(self.name, self.timestamp)
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__repr__ = __str__
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class DroppedEventsEvent(object):
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__slots__ = ['thread', 'reporting_cpu_id', 'timestamp', 'name', 'text', 'fields']
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def __init__(self, cpu_id):
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self.thread = None
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self.reporting_cpu_id = None
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self.timestamp = None
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self.name = 'DROPPED EVENTS DETECTED'
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self.text = None
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self.fields = {'cpu_id': int(cpu_id)}
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def __getattr__(self, name):
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try:
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return self.fields[name]
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except KeyError:
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raise AttributeError(name)
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def __str__(self):
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return 'DROPPED_EVENTS_ON_CPU{}'.format(self.cpu_id)
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__repr__ = __str__
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def try_convert_to_numeric(v):
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try:
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if isiterable(v):
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return map(numeric, v)
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else:
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return numeric(v)
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except ValueError:
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return v
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def default_body_parser(event, text):
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"""
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Default parser to attempt to use to parser body text for the event (i.e. after
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the "header" common to all events has been parsed). This assumes that the body is
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a whitespace-separated list of key=value pairs. The parser will attempt to convert
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the value into a numeric type, and failing that, keep it as string.
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"""
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kv_pairs = [e.split('=', 1) for e in text.split()]
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new_values = {k: try_convert_to_numeric(v)
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for (k, v) in kv_pairs}
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event.fields.update(new_values)
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def regex_body_parser(regex, flags=0):
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"""
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Creates an event body parser form the specified regular expression (could be an
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``re.RegexObject``, or a string). The regular expression should contain some named
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groups, as those will be extracted as the event attributes (unnamed groups and the
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reset of the match will be ignored).
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If the specified regex is a string, it will be compiled, in which case ``flags`` may
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be provided for the resulting regex object (see ``re`` standard module documentation).
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If regex is a pre-compiled object, flags will be ignored.
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"""
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if isinstance(regex, basestring):
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regex = re.compile(regex, flags)
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def regex_parser_func(event, text):
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match = regex.search(text)
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if match:
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event.fields.update(match.groupdict())
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return regex_parser_func
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# Maps event onto the corresponding parser for it's body text. A parser may be
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# a callable with signature
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#
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# parser(event, bodytext)
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#
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# a re.RegexObject, or a string (in which case it will be compiled into a
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# regex). In case of a string/regex, it's named groups will be used to populate
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# the event's attributes.
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EVENT_PARSER_MAP = {
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}
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TRACE_EVENT_REGEX = re.compile(r'^\s+(?P<thread>\S+)\s+\[(?P<cpu_id>\d+)\]\s+(?P<ts>[\d.]+):\s+'
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r'(?P<name>[^:]+):\s+(?P<body>.*?)\s*$')
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DROPPED_EVENTS_REGEX = re.compile(r'CPU:(?P<cpu_id>\d+) \[\d*\s*EVENTS DROPPED\]')
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class TraceCmdTrace(object):
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def __init__(self, filter_markers=True):
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self.filter_markers = filter_markers
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def parse(self, filepath, names=None):
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"""
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This is a generator for the trace event stream.
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"""
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inside_maked_region = False
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filters = [re.compile('^{}$'.format(n)) for n in names or []]
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with open(filepath) as fh:
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for line in fh:
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# if processing trace markers, skip marker lines as well as all
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# lines outside marked region
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if self.filter_markers:
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if not inside_maked_region:
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if TRACE_MARKER_START in line:
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inside_maked_region = True
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continue
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elif TRACE_MARKER_STOP in line:
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inside_maked_region = False
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continue
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match = DROPPED_EVENTS_REGEX.search(line)
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if match:
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yield DroppedEventsEvent(match.group('cpu_id'))
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continue
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match = TRACE_EVENT_REGEX.search(line)
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if not match:
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logger.warning('Invalid trace event: "{}"'.format(line))
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continue
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event_name = match.group('name')
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if filters:
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found = False
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for f in filters:
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if f.search(event_name):
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found = True
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break
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if not found:
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continue
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body_parser = EVENT_PARSER_MAP.get(event_name, default_body_parser)
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if isinstance(body_parser, basestring):
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body_parser = regex_body_parser(body_parser)
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yield TraceCmdEvent(parser=body_parser, **match.groupdict())
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