| <!DOCTYPE html> |
| <!-- |
| Copyright 2016 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. |
| --> |
| |
| <link rel="import" href="/tracing/metrics/metric_registry.html"> |
| <link rel="import" href="/tracing/metrics/system_health/utils.html"> |
| <link rel="import" href="/tracing/model/model.html"> |
| <link rel="import" href="/tracing/value/histogram.html"> |
| |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.metrics.sh', function() { |
| function syncIsComplete(markers) { |
| return markers.length === 2; |
| } |
| |
| function syncInvolvesTelemetry(markers) { |
| for (var marker of markers) |
| if (marker.domainId === tr.model.ClockDomainId.TELEMETRY) |
| return true; |
| |
| return false; |
| } |
| |
| function clockSyncLatencyMetric(values, model) { |
| for (var markers of model.clockSyncManager.markersBySyncId.values()) { |
| var latency = undefined; |
| var targetDomain = undefined; |
| if (!syncIsComplete(markers) || !syncInvolvesTelemetry(markers)) |
| continue; |
| |
| for (var marker of markers) { |
| var domain = marker.domainId; |
| if (domain === tr.model.ClockDomainId.TELEMETRY) |
| latency = (marker.endTs - marker.startTs); |
| else |
| targetDomain = domain.toLowerCase(); |
| } |
| |
| var hist = new tr.v.Histogram('clock_sync_latency_' + targetDomain, |
| tr.b.Unit.byName.timeDurationInMs_smallerIsBetter, |
| tr.v.HistogramBinBoundaries.createExponential(1e-3, 1e3, 30)); |
| hist.description = 'Clock sync latency for domain ' + targetDomain; |
| hist.addSample(latency); |
| values.addHistogram(hist); |
| } |
| } |
| |
| tr.metrics.MetricRegistry.register(clockSyncLatencyMetric); |
| |
| return { |
| clockSyncLatencyMetric: clockSyncLatencyMetric |
| }; |
| }); |
| </script> |
