| // Copyright 2019 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "content/browser/renderer_host/back_forward_cache_metrics.h" |
| |
| #include "base/debug/crash_logging.h" |
| #include "base/debug/dump_without_crashing.h" |
| #include "base/metrics/histogram_functions.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/metrics/metrics_hashes.h" |
| #include "base/metrics/sparse_histogram.h" |
| #include "base/strings/stringprintf.h" |
| #include "components/back_forward_cache/disabled_reason_id.h" |
| #include "content/browser/devtools/devtools_instrumentation.h" |
| #include "content/browser/renderer_host/back_forward_cache_impl.h" |
| #include "content/browser/renderer_host/frame_tree_node.h" |
| #include "content/browser/renderer_host/navigation_entry_impl.h" |
| #include "content/browser/renderer_host/navigation_request.h" |
| #include "content/browser/renderer_host/render_process_host_impl.h" |
| #include "content/browser/renderer_host/should_swap_browsing_instance.h" |
| #include "content/browser/site_instance_impl.h" |
| #include "content/common/debug_utils.h" |
| #include "content/public/browser/back_forward_cache.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "content/public/browser/navigation_details.h" |
| #include "content/public/browser/reload_type.h" |
| #include "services/metrics/public/cpp/ukm_builders.h" |
| #include "services/metrics/public/cpp/ukm_recorder.h" |
| #include "services/metrics/public/cpp/ukm_source_id.h" |
| #include "third_party/blink/public/common/scheduler/web_scheduler_tracked_feature.h" |
| #include "ui/accessibility/ax_event.h" |
| #include "url/gurl.h" |
| #include "url/origin.h" |
| |
| namespace content { |
| |
| namespace { |
| |
| // Overridden time for unit tests. Should be accessed only from the main thread. |
| base::TickClock* g_mock_time_clock_for_testing = nullptr; |
| |
| // Reduce the resolution of the longer intervals due to privacy considerations. |
| base::TimeDelta ClampTime(base::TimeDelta time) { |
| if (time < base::Seconds(5)) |
| return base::Milliseconds(time.InMilliseconds()); |
| if (time < base::Minutes(3)) |
| return base::Seconds(time.InSeconds()); |
| if (time < base::Hours(3)) |
| return base::Minutes(time.InMinutes()); |
| return base::Hours(time.InHours()); |
| } |
| |
| base::TimeTicks Now() { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| if (g_mock_time_clock_for_testing) |
| return g_mock_time_clock_for_testing->NowTicks(); |
| return base::TimeTicks::Now(); |
| } |
| |
| } // namespace |
| |
| // static |
| void BackForwardCacheMetrics::OverrideTimeForTesting(base::TickClock* clock) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| g_mock_time_clock_for_testing = clock; |
| } |
| |
| // static |
| bool BackForwardCacheMetrics::IsCrossDocumentMainFrameHistoryNavigation( |
| NavigationRequest* navigation) { |
| return navigation->IsInPrimaryMainFrame() && |
| !navigation->frame_tree_node()->GetParentOrOuterDocumentOrEmbedder() && |
| !navigation->IsSameDocument() && |
| navigation->GetPageTransition() & ui::PAGE_TRANSITION_FORWARD_BACK; |
| } |
| |
| // static |
| scoped_refptr<BackForwardCacheMetrics> |
| BackForwardCacheMetrics::CreateOrReuseBackForwardCacheMetricsForNavigation( |
| NavigationEntryImpl* previous_entry, |
| bool is_main_frame_navigation, |
| int64_t committing_document_sequence_number) { |
| if (!previous_entry) { |
| // There is no previous NavigationEntry, so we must create a new metrics |
| // object. |
| return base::WrapRefCounted(new BackForwardCacheMetrics( |
| is_main_frame_navigation ? committing_document_sequence_number : -1)); |
| } |
| |
| BackForwardCacheMetrics* previous_entry_metrics = |
| previous_entry->back_forward_cache_metrics(); |
| if (!previous_entry_metrics) { |
| // It's possible to encounter a `previous_entry` without metrics, e.g. on |
| // session restore. We will have to create a new metrics object for the main |
| // document. |
| return base::WrapRefCounted(new BackForwardCacheMetrics( |
| is_main_frame_navigation |
| ? committing_document_sequence_number |
| : previous_entry->root_node() |
| ->frame_entry->document_sequence_number())); |
| } |
| |
| // Reuse `previous_entry_metrics` on subframe navigations and same-document |
| // navigations. |
| if (!is_main_frame_navigation || |
| committing_document_sequence_number == |
| previous_entry_metrics->document_sequence_number_) { |
| return previous_entry_metrics; |
| } |
| |
| return base::WrapRefCounted( |
| new BackForwardCacheMetrics(committing_document_sequence_number)); |
| } |
| |
| BackForwardCacheMetrics::BackForwardCacheMetrics( |
| int64_t document_sequence_number) |
| : document_sequence_number_(document_sequence_number), |
| page_store_result_( |
| std::make_unique<BackForwardCacheCanStoreDocumentResult>()) {} |
| |
| BackForwardCacheMetrics::~BackForwardCacheMetrics() = default; |
| |
| void BackForwardCacheMetrics::MainFrameDidStartNavigationToDocument() { |
| if (!started_navigation_timestamp_) |
| started_navigation_timestamp_ = Now(); |
| } |
| |
| void BackForwardCacheMetrics::DidCommitNavigation( |
| NavigationRequest* navigation, |
| bool back_forward_cache_allowed) { |
| // Back-forward cache in enabled only for primary frame trees, so we need to |
| // record metrics only for primary main frame navigations. |
| if (!navigation->IsInPrimaryMainFrame() || navigation->IsSameDocument()) |
| return; |
| |
| // Record metrics for history navigation, if applicable. |
| if (IsCrossDocumentMainFrameHistoryNavigation(navigation)) { |
| // We have to update not restored reasons even though we already did in |
| // |SendCommitNavigation()|, because the NavigationEntry and |
| // the BackForwardCacheMetrics object might not exist anymore, e.g. when the |
| // NavigationEntry got pruned by another navigation committing before the |
| // history navigation committed. |
| UpdateNotRestoredReasonsForNavigation(navigation); |
| bool can_restore = page_store_result_->CanRestore(); |
| bool did_store = navigation->IsServedFromBackForwardCache(); |
| DCHECK_EQ(can_restore, did_store) << page_store_result_->ToString(); |
| |
| // If a navigation serves the result from back/forward cache, then it must |
| // not have logged any NotRestoredReasons. Also if it is not restored from |
| // back/forward cache, the logged reasons must match the actual condition of |
| // the navigation and other logged data. |
| bool served_from_bfcache_not_match = |
| did_store && !page_store_result_->not_restored_reasons().empty(); |
| bool browsing_instance_not_swapped_not_match = |
| page_store_result_->HasNotRestoredReason( |
| NotRestoredReason::kBrowsingInstanceNotSwapped) && |
| DidSwapBrowsingInstance(); |
| bool disable_for_rfh_not_match = |
| page_store_result_->HasNotRestoredReason( |
| NotRestoredReason::kDisableForRenderFrameHostCalled) && |
| page_store_result_->disabled_reasons().size() == 0; |
| bool blocklisted_features_not_match = |
| page_store_result_->HasNotRestoredReason( |
| NotRestoredReason::kBlocklistedFeatures) && |
| page_store_result_->blocklisted_features().empty(); |
| if (served_from_bfcache_not_match || |
| browsing_instance_not_swapped_not_match || disable_for_rfh_not_match || |
| blocklisted_features_not_match) { |
| CaptureTraceForNavigationDebugScenario( |
| DebugScenario::kDebugBackForwardCacheMetricsMismatch); |
| } |
| |
| // TODO(crbug.com/40229455): Remove this. |
| if (served_from_bfcache_not_match) { |
| SCOPED_CRASH_KEY_BOOL("BFCacheMismatch", "did_store", did_store); |
| SCOPED_CRASH_KEY_BOOL("BFCacheMismatch", "can_restore", can_restore); |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "not_restored", |
| page_store_result_->not_restored_reasons() |
| .GetNth64bitWordBitmask(0) |
| .value()); |
| auto not_restored_1 = |
| page_store_result_->not_restored_reasons().GetNth64bitWordBitmask(1); |
| if (not_restored_1.has_value()) { |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "not_restored_1", |
| not_restored_1.value()); |
| } |
| SCOPED_CRASH_KEY_NUMBER( |
| "BFCacheMismatch", "bi_swap", |
| page_store_result_->browsing_instance_swap_result().has_value() |
| ? static_cast<int>( |
| page_store_result_->browsing_instance_swap_result().value()) |
| : -1); |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "blocklisted", |
| page_store_result_->blocklisted_features() |
| .GetNth64bitWordBitmask(0) |
| .value()); |
| auto blocklisted_1 = |
| page_store_result_->blocklisted_features().GetNth64bitWordBitmask(1); |
| if (blocklisted_1.has_value()) { |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "blocklisted_1", |
| blocklisted_1.value()); |
| } |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "disabled", |
| page_store_result_->disabled_reasons().size()); |
| SCOPED_CRASH_KEY_NUMBER( |
| "BFCacheMismatch", "disallow_activation", |
| page_store_result_->disallow_activation_reasons().size()); |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "restore_type", |
| static_cast<int>(navigation->GetRestoreType())); |
| SCOPED_CRASH_KEY_NUMBER("BFCacheMismatch", "reload_type", |
| static_cast<int>(navigation->GetReloadType())); |
| SCOPED_CRASH_KEY_STRING256("BFCacheMismatch", "url", |
| navigation->GetURL().spec()); |
| SCOPED_CRASH_KEY_STRING256( |
| "BFCacheMismatch", "previous_url", |
| navigation->GetPreviousPrimaryMainFrameURL().spec()); |
| // TODO(https://crbug.com/40229455): Remove this and the debugging above. |
| base::debug::DumpWithoutCrashing(); |
| } |
| |
| TRACE_EVENT1("navigation", "HistoryNavigationOutcome", "outcome", |
| page_store_result_->ToString()); |
| RecordHistoryNavigationUMA(navigation, back_forward_cache_allowed); |
| RecordHistoryNavigationUKM(navigation); |
| if (!navigation->IsServedFromBackForwardCache()) { |
| devtools_instrumentation::BackForwardCacheNotUsed( |
| navigation, page_store_result_.get(), page_store_tree_result_.get()); |
| } |
| if (test_observer_) { |
| // This is for reporting |page_store_tree_result_| for testing. |
| test_observer_->NotifyNotRestoredReasons( |
| std::move(page_store_tree_result_)); |
| } |
| } |
| // Save the information about the last cross-document main frame navigation |
| // that uses this metrics object. |
| last_committed_cross_document_main_frame_navigation_id_ = |
| navigation->GetNavigationId(); |
| |
| // BackForwardCacheMetrics can be reused in some cases. Reset fields for UKM |
| // for the next navigation. |
| page_store_result_ = |
| std::make_unique<BackForwardCacheCanStoreDocumentResult>(); |
| page_store_tree_result_ = nullptr; |
| navigated_away_from_main_document_timestamp_ = std::nullopt; |
| started_navigation_timestamp_ = std::nullopt; |
| renderer_killed_timestamp_ = std::nullopt; |
| browsing_instance_swap_result_ = std::nullopt; |
| } |
| |
| namespace { |
| |
| void RecordDisabledForRenderFrameHostReasonUKM(ukm::SourceId source_id, |
| uint64_t reason) { |
| ukm::builders::BackForwardCacheDisabledForRenderFrameHostReason(source_id) |
| .SetReason2(reason) |
| .Record(ukm::UkmRecorder::Get()); |
| } |
| |
| } // namespace |
| |
| void BackForwardCacheMetrics::RecordHistoryNavigationUKM( |
| NavigationRequest* navigation) { |
| DCHECK(IsCrossDocumentMainFrameHistoryNavigation(navigation)); |
| // We've visited an entry associated with this main frame document before, |
| // so record metrics to determine whether it might be a back-forward cache |
| // hit. |
| ukm::SourceId source_id = ukm::ConvertToSourceId( |
| navigation->GetNavigationId(), ukm::SourceIdType::NAVIGATION_ID); |
| ukm::builders::HistoryNavigation builder(source_id); |
| if (last_committed_cross_document_main_frame_navigation_id_ != -1) { |
| // Only record `last_committed_cross_document_main_frame_navigation_id_` |
| // when it's set. It won't be set if the NavigationEntry this history |
| // navigation is targeting hasn't been navigated to in this session (e.g. |
| // due to session restore or cloning a tab). |
| builder.SetLastCommittedCrossDocumentNavigationSourceIdForTheSameDocument( |
| ukm::ConvertToSourceId( |
| last_committed_cross_document_main_frame_navigation_id_, |
| ukm::SourceIdType::NAVIGATION_ID)); |
| } |
| |
| builder.SetMainFrameFeatures( |
| main_frame_features_.GetNth64bitWordBitmask(0).value()); |
| auto main_frame_features_2 = main_frame_features_.GetNth64bitWordBitmask(1); |
| if (main_frame_features_2.has_value()) { |
| builder.SetMainFrameFeatures2(main_frame_features_2.value()); |
| } |
| |
| builder.SetSameOriginSubframesFeatures( |
| same_origin_frames_features_.GetNth64bitWordBitmask(0).value()); |
| auto same_origin_frames_features_2 = |
| same_origin_frames_features_.GetNth64bitWordBitmask(1); |
| if (same_origin_frames_features_2.has_value()) { |
| builder.SetSameOriginSubframesFeatures2( |
| same_origin_frames_features_2.value()); |
| } |
| |
| builder.SetCrossOriginSubframesFeatures( |
| cross_origin_frames_features_.GetNth64bitWordBitmask(0).value()); |
| auto cross_origin_frames_features_2 = |
| cross_origin_frames_features_.GetNth64bitWordBitmask(1); |
| if (cross_origin_frames_features_2.has_value()) { |
| builder.SetCrossOriginSubframesFeatures2( |
| cross_origin_frames_features_2.value()); |
| } |
| // DidStart notification might be missing for some same-document |
| // navigations. It's good that we don't care about the time in the cache |
| // in that case. |
| if (started_navigation_timestamp_ && |
| navigated_away_from_main_document_timestamp_) { |
| builder.SetTimeSinceNavigatedAwayFromDocument( |
| ClampTime(started_navigation_timestamp_.value() - |
| navigated_away_from_main_document_timestamp_.value()) |
| .InMilliseconds()); |
| } |
| |
| builder.SetBackForwardCache_IsServedFromBackForwardCache( |
| navigation->IsServedFromBackForwardCache()); |
| builder.SetBackForwardCache_NotRestoredReasons( |
| page_store_result_->not_restored_reasons() |
| .GetNth64bitWordBitmask(0) |
| .value()); |
| auto not_restored_reasons_2 = |
| page_store_result_->not_restored_reasons().GetNth64bitWordBitmask(1); |
| if (not_restored_reasons_2.has_value()) { |
| builder.SetBackForwardCache_NotRestoredReasons2( |
| not_restored_reasons_2.value()); |
| } |
| |
| builder.SetBackForwardCache_BlocklistedFeatures( |
| page_store_result_->blocklisted_features() |
| .GetNth64bitWordBitmask(0) |
| .value()); |
| auto blocklisted_features_2 = |
| page_store_result_->blocklisted_features().GetNth64bitWordBitmask(1); |
| if (blocklisted_features_2.has_value()) { |
| builder.SetBackForwardCache_BlocklistedFeatures2( |
| blocklisted_features_2.value()); |
| } |
| |
| if (browsing_instance_swap_result_) { |
| builder.SetBackForwardCache_BrowsingInstanceNotSwappedReason( |
| static_cast<int64_t>(browsing_instance_swap_result_.value())); |
| } |
| |
| builder.SetBackForwardCache_DisabledForRenderFrameHostReasonCount( |
| page_store_result_->disabled_reasons().size()); |
| |
| builder.Record(ukm::UkmRecorder::Get()); |
| |
| bool is_disabled_for_extension_messaging = false; |
| std::string blocking_extension_id; |
| |
| for (const auto& [reason, associated_source_ids] : |
| page_store_result_->disabled_reasons()) { |
| uint64_t reason_value = MetricValue(reason); |
| // We always record the event under the source id that was obtained from |
| // the navigation. |
| RecordDisabledForRenderFrameHostReasonUKM(source_id, reason_value); |
| |
| if (!is_disabled_for_extension_messaging && |
| reason.id == static_cast<BackForwardCache::DisabledReasonType>( |
| back_forward_cache::DisabledReasonId:: |
| kExtensionSentMessageToCachedFrame)) { |
| // Only the first extension (ideally, there should be only one) |
| // that triggers `kExtensionSentMessageToCachedFrame` will be recorded in |
| // the message. |
| is_disabled_for_extension_messaging = true; |
| blocking_extension_id = reason.context; |
| } |
| |
| for (const auto& associated_source_id : associated_source_ids) { |
| if (associated_source_id.has_value()) { |
| RecordDisabledForRenderFrameHostReasonUKM(associated_source_id.value(), |
| reason_value); |
| } |
| } |
| } |
| |
| if (is_disabled_for_extension_messaging) { |
| navigation->GetRenderFrameHost()->AddMessageToConsole( |
| blink::mojom::ConsoleMessageLevel::kWarning, |
| base::StringPrintf( |
| "This page was not restored from back/forward cache because a " |
| "content script from the extension with ID %s received a message " |
| "while the page was cached. This behavior will change shortly " |
| "which may break the extension. If you are the developer of the " |
| "extension, see " |
| "https://developer.chrome.com/blog/" |
| "bfcache-extension-messaging-changes.", |
| blocking_extension_id.c_str())); |
| } |
| |
| for (const uint64_t reason : |
| page_store_result_->disallow_activation_reasons()) { |
| ukm::builders::BackForwardCacheDisallowActivationReason reason_builder( |
| source_id); |
| reason_builder.SetReason(reason); |
| reason_builder.Record(ukm::UkmRecorder::Get()); |
| } |
| } |
| |
| void BackForwardCacheMetrics::MainFrameDidNavigateAwayFromDocument() { |
| // MainFrameDidNavigateAwayFromDocument is called when we commit a navigation |
| // to another main frame document and the current document loses its "last |
| // committed" status. |
| navigated_away_from_main_document_timestamp_ = Now(); |
| } |
| |
| void BackForwardCacheMetrics::RecordFeatureUsage( |
| RenderFrameHostImpl* main_frame) { |
| DCHECK(!main_frame->GetParent()); |
| |
| main_frame_features_.Clear(); |
| same_origin_frames_features_.Clear(); |
| cross_origin_frames_features_.Clear(); |
| |
| CollectFeatureUsageFromSubtree(main_frame, |
| main_frame->GetLastCommittedOrigin()); |
| } |
| |
| void BackForwardCacheMetrics::CollectFeatureUsageFromSubtree( |
| RenderFrameHostImpl* rfh, |
| const url::Origin& main_frame_origin) { |
| blink::scheduler::WebSchedulerTrackedFeatures features = |
| rfh->GetBackForwardCacheDisablingFeatures(); |
| if (!rfh->GetParent()) { |
| main_frame_features_.PutAll(features); |
| } else if (rfh->GetLastCommittedOrigin().IsSameOriginWith( |
| main_frame_origin)) { |
| same_origin_frames_features_.PutAll(features); |
| } else { |
| cross_origin_frames_features_.PutAll(features); |
| } |
| |
| for (size_t i = 0; i < rfh->child_count(); ++i) { |
| CollectFeatureUsageFromSubtree(rfh->child_at(i)->current_frame_host(), |
| main_frame_origin); |
| } |
| } |
| |
| void BackForwardCacheMetrics::AddNotRestoredFlattenedReasonsToExistingResult( |
| BackForwardCacheCanStoreDocumentResult& flattened) { |
| page_store_result_->AddReasonsFrom(flattened); |
| |
| const BackForwardCacheCanStoreDocumentResult::NotRestoredReasons& |
| not_restored_reasons = flattened.not_restored_reasons(); |
| |
| if (not_restored_reasons.Has(NotRestoredReason::kRendererProcessKilled)) { |
| renderer_killed_timestamp_ = Now(); |
| } |
| } |
| |
| void BackForwardCacheMetrics::SetNotRestoredReasons( |
| BackForwardCacheCanStoreDocumentResultWithTree& can_store) { |
| DCHECK(can_store.tree_reasons->FlattenTree() == can_store.flattened_reasons); |
| page_store_tree_result_ = std::move(can_store.tree_reasons); |
| AddNotRestoredFlattenedReasonsToExistingResult(can_store.flattened_reasons); |
| } |
| |
| blink::mojom::BackForwardCacheNotRestoredReasonsPtr |
| BackForwardCacheMetrics::GetWebExposedNotRestoredReasons() { |
| return page_store_tree_result_->GetWebExposedNotRestoredReasons(); |
| } |
| |
| void BackForwardCacheMetrics::UpdateNotRestoredReasonsForNavigation( |
| NavigationRequest* navigation) { |
| DCHECK(IsCrossDocumentMainFrameHistoryNavigation(navigation)); |
| BackForwardCacheCanStoreDocumentResult new_blocking_reasons; |
| // |last_committed_cross_document_main_frame_navigation_id_| is -1 even though |
| // this is a history navigation. This can happen only when the session history |
| // has been restored, as the NavigationEntry will exist and can be navigated |
| // to, but the BackForwardCacheMetrics object is brand new (as it's not |
| // persisted and restored). |
| if (last_committed_cross_document_main_frame_navigation_id_ == -1) { |
| new_blocking_reasons.No(NotRestoredReason::kSessionRestored); |
| } |
| |
| // TODO(rakina): Remove this call from here and move it to |
| // |SetNotRestoredReasons()| that is called from |UnloadOldFrame()|. |
| if (!DidSwapBrowsingInstance()) { |
| new_blocking_reasons.No(NotRestoredReason::kBrowsingInstanceNotSwapped); |
| } |
| |
| // This should not happen, but record this as an 'unknown' reason just in |
| // case. |
| if (page_store_result_->not_restored_reasons().empty() && |
| new_blocking_reasons.not_restored_reasons().empty() && |
| !navigation->IsServedFromBackForwardCache()) { |
| // TODO(altimin): Add a (D)CHECK here, but this code is reached in |
| // unittests. |
| new_blocking_reasons.No(NotRestoredReason::kUnknown); |
| } |
| |
| page_store_result_->AddReasonsFrom(new_blocking_reasons); |
| |
| // Initialize the empty tree result if nothing is set. |
| if (!page_store_tree_result_) { |
| page_store_tree_result_ = |
| BackForwardCacheCanStoreTreeResult::CreateEmptyTreeForNavigation( |
| navigation); |
| } |
| // Add the same reason to the root node of the tree once we update the |
| // flattened list of reasons. |
| page_store_tree_result_->AddReasonsToSubtreeRootFrom(new_blocking_reasons); |
| |
| TRACE_EVENT("navigation", |
| "BackForwardCacheMetrics::UpdateNotRestoredReasonsForNavigation", |
| ChromeTrackEvent::kBackForwardCacheCanStoreDocumentResult, |
| *(page_store_result_.get())); |
| } |
| |
| void BackForwardCacheMetrics::RecordHistoryNavigationUMA( |
| NavigationRequest* navigation, |
| bool back_forward_cache_allowed) const { |
| HistoryNavigationOutcome outcome = HistoryNavigationOutcome::kNotRestored; |
| if (navigation->IsServedFromBackForwardCache()) { |
| outcome = HistoryNavigationOutcome::kRestored; |
| |
| if (back_forward_cache_allowed) { |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.EvictedAfterDocumentRestoredReason", |
| EvictedAfterDocumentRestoredReason::kRestored); |
| } |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.EvictedAfterDocumentRestoredReason", |
| EvictedAfterDocumentRestoredReason::kRestored); |
| } |
| |
| if (back_forward_cache_allowed) { |
| UMA_HISTOGRAM_ENUMERATION("BackForwardCache.HistoryNavigationOutcome", |
| outcome); |
| int nav_offset = navigation->GetNavigationEntryOffset(); |
| HistoryNavigationDirection direction = |
| nav_offset == 0 |
| ? HistoryNavigationDirection::kSameEntry |
| : (nav_offset < 0 ? HistoryNavigationDirection::kBack |
| : HistoryNavigationDirection::kForward); |
| if (navigation->IsServedFromBackForwardCache()) { |
| base::UmaHistogramEnumeration( |
| "BackForwardCache.RestoredNavigationDirection", direction); |
| } else { |
| base::UmaHistogramEnumeration( |
| "BackForwardCache.NonRestoredNavigationDirection", direction); |
| } |
| } |
| |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.HistoryNavigationOutcome", outcome); |
| |
| if (had_form_data_associated()) { |
| UMA_HISTOGRAM_ENUMERATION("BackForwardCache.PageWithForm.RestoreResult", |
| outcome); |
| } |
| |
| for (NotRestoredReason reason : page_store_result_->not_restored_reasons()) { |
| DCHECK(!navigation->IsServedFromBackForwardCache()); |
| if (back_forward_cache_allowed) { |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.HistoryNavigationOutcome.NotRestoredReason", |
| reason); |
| } |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.HistoryNavigationOutcome.NotRestoredReason", |
| reason); |
| if (reason == NotRestoredReason::kRendererProcessKilled) { |
| CHECK(renderer_killed_timestamp_); |
| // It's possible (https://crbug.com/427426299) for the renderer to be |
| // killed before we record this timestamp. In that case, record 0. |
| base::TimeDelta time = |
| navigated_away_from_main_document_timestamp_ |
| ? (renderer_killed_timestamp_.value() - |
| navigated_away_from_main_document_timestamp_.value()) |
| : base::Seconds(0); |
| UMA_HISTOGRAM_LONG_TIMES( |
| "BackForwardCache.Eviction.TimeUntilProcessKilled", time); |
| } |
| } |
| |
| for (blink::scheduler::WebSchedulerTrackedFeature feature : |
| page_store_result_->blocklisted_features()) { |
| if (back_forward_cache_allowed) { |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.HistoryNavigationOutcome.BlocklistedFeature", |
| feature); |
| } |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.HistoryNavigationOutcome." |
| "BlocklistedFeature", |
| feature); |
| } |
| |
| if (back_forward_cache_allowed) { |
| for (const auto& [reason, _] : page_store_result_->disabled_reasons()) { |
| // Use SparseHistogram instead of other simple macros for metrics. The |
| // reasons cannot be represented as a unified enum because they come from |
| // multiple sources. At first they were represented as strings but that |
| // makes it hard to track new additions. Now they are represented by |
| // a combination of source and source-specific enum. |
| base::UmaHistogramSparse( |
| "BackForwardCache.HistoryNavigationOutcome." |
| "DisabledForRenderFrameHostReason2", |
| MetricValue(reason)); |
| } |
| |
| for (const uint64_t reason : |
| page_store_result_->disallow_activation_reasons()) { |
| base::UmaHistogramSparse( |
| "BackForwardCache.HistoryNavigationOutcome." |
| "DisallowActivationReason", |
| reason); |
| } |
| } |
| |
| if (!DidSwapBrowsingInstance()) { |
| DCHECK(!navigation->IsServedFromBackForwardCache()); |
| |
| if (back_forward_cache_allowed) { |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.HistoryNavigationOutcome." |
| "BrowsingInstanceNotSwappedReason", |
| browsing_instance_swap_result_.value()); |
| } |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.HistoryNavigationOutcome." |
| "BrowsingInstanceNotSwappedReason", |
| browsing_instance_swap_result_.value()); |
| |
| if (back_forward_cache_allowed && |
| browsing_instance_swap_result_ == |
| ShouldSwapBrowsingInstance::kNo_HasRelatedActiveContents) { |
| CHECK_GT(related_active_contents_count_, 1); |
| // If a page was not restored from the back/forward cache because there |
| // are related active contents, log the details of the related active |
| // contents. Note that this also logs in cases where there are other |
| // reasons causing the page to not get restored from the back/forward |
| // cache (e.g. use of blocking features). |
| base::UmaHistogramCounts100( |
| "BackForwardCache.HistoryNavigationOutcome." |
| "RelatedActiveContents.Count2", |
| related_active_contents_count_); |
| base::UmaHistogramEnumeration( |
| "BackForwardCache.HistoryNavigationOutcome." |
| "RelatedActiveContents.IsPotentiallySyncAccessible2", |
| related_active_contents_sync_access_info_); |
| } |
| } |
| } |
| |
| void BackForwardCacheMetrics::RecordEvictedAfterDocumentRestored( |
| EvictedAfterDocumentRestoredReason reason) { |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.EvictedAfterDocumentRestoredReason", reason); |
| UMA_HISTOGRAM_ENUMERATION( |
| "BackForwardCache.AllSites.EvictedAfterDocumentRestoredReason", reason); |
| } |
| |
| // static |
| uint64_t BackForwardCacheMetrics::MetricValue( |
| BackForwardCache::DisabledReason reason) { |
| return static_cast<BackForwardCache::DisabledReasonType>(reason.source) |
| << BackForwardCache::kDisabledReasonTypeBits | |
| reason.id; |
| } |
| |
| void BackForwardCacheMetrics::SetBrowsingInstanceSwapResult( |
| std::optional<ShouldSwapBrowsingInstance> reason, |
| RenderFrameHostImpl* navigated_away_rfh) { |
| browsing_instance_swap_result_ = reason; |
| if (navigated_away_rfh) { |
| SetRelatedActiveContentsInfo(navigated_away_rfh); |
| } else { |
| // The tracked reason is being reset as a result of prerender activation. |
| // Also reset `related_active_contents_count_` and |
| // `related_active_contents_sync_access_info_` as they are stale too. |
| CHECK(!reason.has_value()); |
| related_active_contents_count_ = 1; |
| related_active_contents_sync_access_info_ = |
| RelatedActiveContentsSyncAccessInfo::kNoSyncAccess; |
| } |
| } |
| |
| void BackForwardCacheMetrics::SetRelatedActiveContentsInfo( |
| RenderFrameHostImpl* navigated_away_rfh) { |
| CHECK(navigated_away_rfh->is_main_frame()); |
| related_active_contents_count_ = |
| navigated_away_rfh->GetSiteInstance()->GetRelatedActiveContentsCount(); |
| |
| // Count how many documents in the navigating page are using each SiteInfo. |
| std::map<SiteInfo, int> doc_count_in_page; |
| navigated_away_rfh->ForEachRenderFrameHost([&doc_count_in_page]( |
| RenderFrameHost* rfh) { |
| const SiteInfo& site_info = static_cast<RenderFrameHostImpl*>(rfh) |
| ->last_committed_url_derived_site_info(); |
| if (doc_count_in_page.contains(site_info)) { |
| doc_count_in_page[site_info]++; |
| } else { |
| doc_count_in_page[site_info] = 1; |
| } |
| }); |
| |
| // Determine if any document in the navigating page is potentially |
| // synchronously accessible by documents in other pages, by checking if there |
| // are documents in other pages that use the same SiteInfo as a document in |
| // the navigating page. This uses SiteInfos derived from document URLs, which |
| // works even when Site Isolation is disabled and the default SiteInstance may |
| // contain multiple sites. |
| related_active_contents_sync_access_info_ = |
| RelatedActiveContentsSyncAccessInfo::kNoSyncAccess; |
| navigated_away_rfh->ForEachRenderFrameHostWithAction( |
| [&doc_count_in_page, this](RenderFrameHost* rfh) { |
| // `active_document_count()` counts the number of committed |
| // documents in all pages that are using the same SiteInfo, including |
| // the navigating page. To get the number of committed documents using |
| // the same SiteInfo in pages other than the navigating page, just |
| // subtract by the number of committed documents using SiteInfo in the |
| // navigating page. |
| auto* rfhi = static_cast<RenderFrameHostImpl*>(rfh); |
| const SiteInfo& site_info = |
| rfhi->last_committed_url_derived_site_info(); |
| int matching_doc_count = |
| rfhi->GetSiteInstance()->GetActiveDocumentCount(site_info); |
| int matching_doc_in_other_pages_count = |
| matching_doc_count - doc_count_in_page[site_info]; |
| if (matching_doc_in_other_pages_count > 0) { |
| // The document shares a SiteInfo with another tab. This means the |
| // contents of this document might be synchronously accessible by |
| // a document in another tab (either because the documents are |
| // same-origin, or through modifying document.domain), so note down |
| // this information. |
| related_active_contents_sync_access_info_ = |
| RelatedActiveContentsSyncAccessInfo::kPotentiallySyncAccessible; |
| // Once we've found a case where sync access is possible, we can stop, |
| // as we've reached the maximum value for the enum |
| // (kPotentiallySyncAccessible). |
| return RenderFrameHost::FrameIterationAction::kStop; |
| } |
| return RenderFrameHost::FrameIterationAction::kContinue; |
| }); |
| } |
| |
| bool BackForwardCacheMetrics::DidSwapBrowsingInstance() const { |
| if (!browsing_instance_swap_result_) |
| return true; |
| |
| switch (browsing_instance_swap_result_.value()) { |
| case ShouldSwapBrowsingInstance::kNo_ProactiveSwapDisabled: |
| case ShouldSwapBrowsingInstance::kNo_NotMainFrame: |
| case ShouldSwapBrowsingInstance::kNo_HasRelatedActiveContents: |
| case ShouldSwapBrowsingInstance::kNo_DoesNotHaveSite: |
| case ShouldSwapBrowsingInstance::kNo_SourceURLSchemeIsNotHTTPOrHTTPS: |
| case ShouldSwapBrowsingInstance::kNo_SameSiteNavigation: |
| case ShouldSwapBrowsingInstance::kNo_AlreadyHasMatchingBrowsingInstance: |
| case ShouldSwapBrowsingInstance::kNo_RendererDebugURL: |
| case ShouldSwapBrowsingInstance::kNo_NotNeededForBackForwardCache: |
| case ShouldSwapBrowsingInstance::kNo_SameDocumentNavigation: |
| case ShouldSwapBrowsingInstance::kNo_SameUrlNavigation: |
| case ShouldSwapBrowsingInstance::kNo_WillReplaceEntry: |
| case ShouldSwapBrowsingInstance::kNo_Reload: |
| case ShouldSwapBrowsingInstance::kNo_Guest: |
| case ShouldSwapBrowsingInstance::kNo_HasNotComittedAnyNavigation: |
| case ShouldSwapBrowsingInstance::kNo_NotPrimaryMainFrame: |
| case ShouldSwapBrowsingInstance::kNo_InitiatorRequestedNoProactiveSwap: |
| return false; |
| case ShouldSwapBrowsingInstance::kYes_ForceSwap: |
| case ShouldSwapBrowsingInstance::kYes_CrossSiteProactiveSwap: |
| case ShouldSwapBrowsingInstance::kYes_SameSiteProactiveSwap: |
| return true; |
| } |
| } |
| |
| std::string BackForwardCacheMetrics::GetPageStoredResultString() { |
| return page_store_result_->ToString(); |
| } |
| |
| } // namespace content |
