Revert of [telemetry] Add a V8GCTimes measurement and benchmarks.

tools/perf/measurements/v8_gc_times.py

-# Copyright 2015 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.
-
-from telemetry.core.platform import tracing_category_filter
-from telemetry.core.platform import tracing_options
-from telemetry.page import page_test
-from telemetry.timeline.model import TimelineModel
-from telemetry.util import statistics
-from telemetry.value import scalar
-
-
-class V8GCTimes(page_test.PageTest):
-
-  _TIME_OUT_IN_SECONDS = 60
-  _CATEGORIES = ['blink.console',
-                 'renderer.scheduler',
-                 'toplevel',
-                 'v8',
-                 'webkit.console']
-  _RENDERER_MAIN_THREAD = 'CrRendererMain'
-  _IDLE_TASK_PARENT = 'SingleThreadIdleTaskRunner::RunTask'
-
-  def __init__(self):
-    super(V8GCTimes, self).__init__('RunPageInteractions')
-    self._v8_event_stats = [
-        V8EventStat('V8.GCIncrementalMarking',
-                    'v8_gc_incremental_marking',
-                    'incremental marking steps'),
-        V8EventStat('V8.GCScavenger',
-                    'v8_gc_scavenger',
-                    'scavenges'),
-        V8EventStat('V8.GCCompactor',
-                    'v8_gc_mark_compactor',
-                    'mark-sweep-compactor')]
-    self._renderer_process = None
-
-  def WillNavigateToPage(self, page, tab):
-    category_filter = tracing_category_filter.TracingCategoryFilter()
-
-    for category in self._CATEGORIES:
-      category_filter.AddIncludedCategory(category)
-
-    options = tracing_options.TracingOptions()
-    options.enable_chrome_trace = True
-
-    tab.browser.platform.tracing_controller.Start(
-        options, category_filter, self._TIME_OUT_IN_SECONDS)
-
-  def DidRunActions(self, page, tab):
-    trace_data = tab.browser.platform.tracing_controller.Stop()
-    timeline_model = TimelineModel(trace_data)
-
-    self._renderer_process = timeline_model.GetRendererProcessFromTabId(tab.id)
-
-  def ValidateAndMeasurePage(self, page, tab, results):
-    self._AddV8MetricsToResults(self._renderer_process, results)
-
-  def _AddV8MetricsToResults(self, process, results):
-    if process is None:
-      return
-
-    for thread in process.threads.values():
-      if thread.name != self._RENDERER_MAIN_THREAD:
-        continue
-
-      self._AddV8EventStatsToResults(thread, results)
-      self._AddCpuTimeStatsToResults(thread, results)
-
-  def _AddV8EventStatsToResults(self, thread, results):
-    # Find all V8 GC events in the trace.
-    for event in thread.IterAllSlices():
-      event_stat = _FindV8EventStatForEvent(self._v8_event_stats, event.name)
-      if not event_stat:
-        continue
-
-      event_stat.thread_duration += event.thread_duration
-
-      parent_idle_task = _ParentIdleTask(event)
-      if parent_idle_task:
-        allotted_idle_time = parent_idle_task.args['allotted_time_ms']
-        idle_task_wall_overrun = 0
-        if event.duration > allotted_idle_time:
-          idle_task_wall_overrun = event.duration - allotted_idle_time
-        # Don't count time over the deadline as being inside idle time.
-        # Since the deadline should be relative to wall clock we compare
-        # allotted_time_ms with wall duration instead of thread duration, and
-        # then assume the thread duration was inside idle for the same
-        # percentage of time.
-        inside_idle = event.thread_duration * statistics.DivideIfPossibleOrZero(
-            event.duration - idle_task_wall_overrun, event.duration)
-        event_stat.thread_duration_inside_idle += inside_idle
-        event_stat.idle_task_overrun_duration += idle_task_wall_overrun
-
-    for v8_event_stat in self._v8_event_stats:
-      results.AddValue(scalar.ScalarValue(
-          results.current_page, v8_event_stat.result_name, 'ms',
-          v8_event_stat.thread_duration,
-          ('Total thread duration spent in %s' %
-           v8_event_stat.result_description)))
-      results.AddValue(scalar.ScalarValue(results.current_page,
-          '%s_outside_idle' % v8_event_stat.result_name, 'ms',
-          v8_event_stat.thread_duration_outside_idle,
-          ('Total thread duration spent in %s outside of idle tasks' %
-           v8_event_stat.result_description)))
-      results.AddValue(scalar.ScalarValue(results.current_page,
-          '%s_idle_deadline_overrun' % v8_event_stat.result_name, 'ms',
-          v8_event_stat.idle_task_overrun_duration,
-          ('Total idle task deadline overrun for %s idle tasks'
-           % v8_event_stat.result_description)))
-      results.AddValue(scalar.ScalarValue(results.current_page,
-          '%s_percentage_idle' % v8_event_stat.result_name, '%',
-          v8_event_stat.percentage_thread_duration_during_idle,
-          ('Percentage of %s spent in idle time' %
-           v8_event_stat.result_description)))
-
-    # Add total metrics.
-    gc_total = sum(x.thread_duration for x in self._v8_event_stats)
-    gc_total_outside_idle = sum(
-        x.thread_duration_outside_idle for x in self._v8_event_stats)
-    gc_total_idle_deadline_overrun = sum(
-        x.idle_task_overrun_duration for x in self._v8_event_stats)
-    gc_total_percentage_idle = statistics.DivideIfPossibleOrZero(
-        100 * (gc_total - gc_total_outside_idle), gc_total)
-
-    results.AddValue(scalar.ScalarValue(results.current_page,
-        'v8_gc_total', 'ms', gc_total,
-        'Total thread duration of all garbage collection events'))
-    results.AddValue(scalar.ScalarValue(results.current_page,
-        'v8_gc_total_outside_idle', 'ms', gc_total_outside_idle,
-        'Total thread duration of all garbage collection events outside of '
-        'idle tasks'))
-    results.AddValue(scalar.ScalarValue(results.current_page,
-        'v8_gc_total_idle_deadline_overrun', 'ms',
-        gc_total_idle_deadline_overrun,
-        'Total idle task deadline overrun for all idle tasks garbage '
-        'collection events'))
-    results.AddValue(scalar.ScalarValue(results.current_page,
-        'v8_gc_total_percentage_idle', '%', gc_total_percentage_idle,
-        'Percentage of the thread duration of all garbage collection events '
-        'spent inside of idle tasks'))
-
-  def _AddCpuTimeStatsToResults(self, thread, results):
-    if thread.toplevel_slices:
-      start_time = min(s.start for s in thread.toplevel_slices)
-      end_time = max(s.end for s in thread.toplevel_slices)
-      duration = end_time - start_time
-      cpu_time = sum(s.thread_duration for s in thread.toplevel_slices)
-    else:
-      duration = cpu_time = 0
-
-    results.AddValue(scalar.ScalarValue(
-        results.current_page, 'duration', 'ms', duration))
-    results.AddValue(scalar.ScalarValue(
-        results.current_page, 'cpu_time', 'ms', cpu_time))
-
-
-def _FindV8EventStatForEvent(v8_event_stats_list, event_name):
-  for v8_event_stat in v8_event_stats_list:
-    if v8_event_stat.src_event_name == event_name:
-      return v8_event_stat
-  return None
-
-
-def _ParentIdleTask(event):
-  parent = event.parent_slice
-  while parent:
-    if parent.name == V8GCTimes._IDLE_TASK_PARENT:
-      return parent
-    parent = parent.parent_slice
-  return None
-
-
-class V8EventStat(object):
-
-  def __init__(self, src_event_name, result_name, result_description):
-    self.src_event_name = src_event_name
-    self.result_name = result_name
-    self.result_description = result_description
-    self.thread_duration = 0.0
-    self.thread_duration_inside_idle = 0.0
-    self.idle_task_overrun_duration = 0.0
-
-  @property
-  def thread_duration_outside_idle(self):
-    return self.thread_duration - self.thread_duration_inside_idle
-
-  @property
-  def percentage_thread_duration_during_idle(self):
-    return statistics.DivideIfPossibleOrZero(
-        100 * self.thread_duration_inside_idle, self.thread_duration)