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// 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 "components/performance_manager/freezing/frozen_frame_aggregator.h"
#include "components/performance_manager/freezing/frozen_data.h"
#include "components/performance_manager/graph/frame_node_impl.h"
#include "components/performance_manager/graph/graph_impl.h"
#include "components/performance_manager/graph/page_node_impl.h"
#include "components/performance_manager/graph/process_node_impl.h"
#include "components/performance_manager/public/graph/node_data_describer_registry.h"
namespace performance_manager {
using LifecycleState = performance_manager::mojom::LifecycleState;
namespace {
const char kDescriberName[] = "FrozenFrameAggregator";
bool IsFrozen(const FrameNodeImpl* frame_node) {
return frame_node->GetLifecycleState() == LifecycleState::kFrozen;
}
} // namespace
FrozenFrameAggregator::FrozenFrameAggregator() = default;
FrozenFrameAggregator::~FrozenFrameAggregator() = default;
void FrozenFrameAggregator::OnFrameNodeAdded(const FrameNode* frame_node) {
auto* frame_impl = FrameNodeImpl::FromNode(frame_node);
DCHECK(!IsFrozen(frame_impl)); // A newly created node can never be frozen.
AddOrRemoveFrame(frame_impl, 1);
}
void FrozenFrameAggregator::OnBeforeFrameNodeRemoved(
const FrameNode* frame_node) {
AddOrRemoveFrame(FrameNodeImpl::FromNode(frame_node), -1);
}
void FrozenFrameAggregator::OnCurrentFrameChanged(
const FrameNode* previous_frame_node,
const FrameNode* current_frame_node) {
if (previous_frame_node) {
auto* frame_impl = FrameNodeImpl::FromNode(previous_frame_node);
CHECK(!frame_impl->IsCurrent());
int32_t current_frame_delta = -1;
int32_t frozen_frame_delta = IsFrozen(frame_impl) ? -1 : 0;
UpdateFrameCounts(frame_impl, current_frame_delta, frozen_frame_delta);
}
if (current_frame_node) {
auto* frame_impl = FrameNodeImpl::FromNode(current_frame_node);
CHECK(frame_impl->IsCurrent());
int32_t current_frame_delta = 1;
int32_t frozen_frame_delta = IsFrozen(frame_impl) ? 1 : 0;
UpdateFrameCounts(frame_impl, current_frame_delta, frozen_frame_delta);
}
}
void FrozenFrameAggregator::OnFrameLifecycleStateChanged(
const FrameNode* frame_node) {
auto* frame_impl = FrameNodeImpl::FromNode(frame_node);
if (!frame_impl->IsCurrent()) {
return;
}
int32_t frozen_frame_delta = IsFrozen(frame_impl) ? 1 : -1;
UpdateFrameCounts(frame_impl, 0, frozen_frame_delta);
}
void FrozenFrameAggregator::OnPassedToGraph(Graph* graph) {
RegisterObservers(graph);
graph->GetNodeDataDescriberRegistry()->RegisterDescriber(this,
kDescriberName);
}
void FrozenFrameAggregator::OnTakenFromGraph(Graph* graph) {
graph->GetNodeDataDescriberRegistry()->UnregisterDescriber(this);
UnregisterObservers(graph);
}
void FrozenFrameAggregator::OnPageNodeAdded(const PageNode* page_node) {
DCHECK_EQ(LifecycleState::kRunning, page_node->GetLifecycleState());
FrozenData::Create(PageNodeImpl::FromNode(page_node));
}
void FrozenFrameAggregator::OnProcessNodeAdded(
const ProcessNode* process_node) {
FrozenData::Create(ProcessNodeImpl::FromNode(process_node));
}
base::Value::Dict FrozenFrameAggregator::DescribePageNodeData(
const PageNode* node) const {
FrozenData& data = FrozenData::Get(PageNodeImpl::FromNode(node));
return data.Describe();
}
base::Value::Dict FrozenFrameAggregator::DescribeProcessNodeData(
const ProcessNode* node) const {
FrozenData& data = FrozenData::Get(ProcessNodeImpl::FromNode(node));
return data.Describe();
}
void FrozenFrameAggregator::RegisterObservers(Graph* graph) {
// This observer presumes that it's been added before any nodes exist in the
// graph.
// TODO(chrisha): Add graph introspection functions to Graph.
DCHECK(graph->HasOnlySystemNode());
graph->AddFrameNodeObserver(this);
graph->AddPageNodeObserver(this);
graph->AddProcessNodeObserver(this);
}
void FrozenFrameAggregator::UnregisterObservers(Graph* graph) {
graph->RemoveFrameNodeObserver(this);
graph->RemovePageNodeObserver(this);
graph->RemoveProcessNodeObserver(this);
}
void FrozenFrameAggregator::AddOrRemoveFrame(FrameNodeImpl* frame_node,
int32_t delta) {
int32_t current_frame_delta = 0;
int32_t frozen_frame_delta = 0;
if (frame_node->IsCurrent()) {
current_frame_delta = delta;
if (IsFrozen(frame_node))
frozen_frame_delta = delta;
}
UpdateFrameCounts(frame_node, current_frame_delta, frozen_frame_delta);
}
void FrozenFrameAggregator::UpdateFrameCounts(FrameNodeImpl* frame_node,
int32_t current_frame_delta,
int32_t frozen_frame_delta) {
// If a non-current frame is added or removed the deltas can be zero. In this
// case the logic can be aborted early to save some effort.
if (current_frame_delta == 0 && frozen_frame_delta == 0)
return;
auto* page_node = frame_node->page_node();
auto* process_node = frame_node->process_node();
FrozenData& page_data = FrozenData::Get(page_node);
FrozenData& process_data = FrozenData::Get(process_node);
// We should only have frames attached to renderer processes.
DCHECK_EQ(content::PROCESS_TYPE_RENDERER, process_node->GetProcessType());
// Set the page lifecycle state based on the state of the frame tree.
if (page_data.ChangeFrameCounts(current_frame_delta, frozen_frame_delta)) {
page_node->SetLifecycleState(base::PassKey<FrozenFrameAggregator>(),
page_data.AsLifecycleState());
}
// Update the process state, and notify when all frames in the tree are
// frozen.
if (process_data.ChangeFrameCounts(current_frame_delta, frozen_frame_delta) &&
process_data.IsFrozen()) {
process_node->OnAllFramesInProcessFrozen(
base::PassKey<FrozenFrameAggregator>());
}
}
} // namespace performance_manager
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