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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/performance_manager/policies/termination_target_policy.h"
#include <algorithm>
#include <cstdint>
#include "chrome/browser/performance_manager/policies/discard_eligibility_policy.h"
#include "components/performance_manager/public/graph/frame_node.h"
#include "content/public/common/process_type.h"
namespace performance_manager {
// Private memory footprint threshold above which a process is considered large.
constexpr uint64_t kLargeProcessFootprintThresholdKb = 100 * 1024; // 100 MiB
namespace {
struct PotentialTerminationTarget {
raw_ptr<const ProcessNode> process = nullptr;
uint64_t private_footprint_kb = 0;
bool can_discard = true;
// Last time a page in the process was visible. `base::TimeTicks::Max()` if
// currently visible. `base::TimeTicks()` if there is no visible page in the
// process.
base::TimeTicks last_visible_time;
// Returns true if `this` is a better termination target than `other`.
bool operator<(const PotentialTerminationTarget& other) const {
if (is_large() != other.is_large()) {
return is_large();
}
if (can_discard != other.can_discard) {
return can_discard;
}
return last_visible_time < other.last_visible_time;
}
bool is_large() const {
return private_footprint_kb > kLargeProcessFootprintThresholdKb;
}
};
} // namespace
TerminationTargetPolicy::TerminationTargetPolicy(
std::unique_ptr<TerminationTargetSetter> termination_target_setter)
: termination_target_setter_(std::move(termination_target_setter)) {}
TerminationTargetPolicy::~TerminationTargetPolicy() {
if (current_termination_target_) {
termination_target_setter_->SetTerminationTarget(nullptr);
}
}
void TerminationTargetPolicy::OnPassedToGraph(Graph* graph) {
graph->AddSystemNodeObserver(this);
graph->AddPageNodeObserver(this);
graph->AddProcessNodeObserver(this);
}
void TerminationTargetPolicy::OnTakenFromGraph(Graph* graph) {
graph->RemoveProcessNodeObserver(this);
graph->RemovePageNodeObserver(this);
graph->RemoveSystemNodeObserver(this);
}
void TerminationTargetPolicy::OnIsVisibleChanged(const PageNode* page_node) {
UpdateTerminationTarget();
}
void TerminationTargetPolicy::OnPageNodeRemoved(const PageNode* page_node) {
UpdateTerminationTarget();
}
void TerminationTargetPolicy::OnBeforeProcessNodeRemoved(
const ProcessNode* process_node) {
if (process_node == current_termination_target_) {
UpdateTerminationTarget(/*process_being_deleted=*/process_node);
}
}
void TerminationTargetPolicy::OnProcessLifetimeChange(
const ProcessNode* process_node) {
if (process_node == current_termination_target_) {
UpdateTerminationTarget(process_node);
}
}
void TerminationTargetPolicy::OnProcessMemoryMetricsAvailable(
const SystemNode* system_node) {
UpdateTerminationTarget();
}
void TerminationTargetPolicy::UpdateTerminationTarget(
const ProcessNode* process_being_deleted) {
std::vector<PotentialTerminationTarget> targets;
auto process_nodes = GetOwningGraph()->GetAllProcessNodes();
targets.reserve(process_nodes.size());
policies::DiscardEligibilityPolicy* eligibility_policy =
policies::DiscardEligibilityPolicy::GetFromGraph(GetOwningGraph());
for (const ProcessNode* process_node : process_nodes) {
if (process_node->GetProcessType() != content::PROCESS_TYPE_RENDERER) {
continue;
}
if (process_node == process_being_deleted) {
continue;
}
if (!process_node->GetProcess().IsValid()) {
continue;
}
targets.emplace_back();
PotentialTerminationTarget& target = targets.back();
target.process = process_node;
target.private_footprint_kb = process_node->GetPrivateFootprintKb();
for (const FrameNode* frame_node : process_node->GetFrameNodes()) {
const PageNode* page_node = frame_node->GetPageNode();
if (eligibility_policy->CanDiscard(
page_node,
policies::DiscardEligibilityPolicy::DiscardReason::URGENT,
/*minimum_time_in_background=*/base::TimeDelta()) !=
policies::CanDiscardResult::kEligible) {
target.can_discard = false;
}
if (page_node->IsVisible()) {
target.last_visible_time = base::TimeTicks::Max();
} else {
target.last_visible_time = std::max(
target.last_visible_time, page_node->GetLastVisibilityChangeTime());
}
}
}
auto min_element_it = std::min_element(targets.begin(), targets.end());
if (min_element_it != targets.end()) {
if (min_element_it->process != current_termination_target_) {
termination_target_setter_->SetTerminationTarget(min_element_it->process);
current_termination_target_ = min_element_it->process;
}
} else if (current_termination_target_) {
termination_target_setter_->SetTerminationTarget(nullptr);
current_termination_target_ = nullptr;
}
}
} // namespace performance_manager
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