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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 "chrome/browser/performance_manager/policies/working_set_trimmer_policy.h"
#include "base/metrics/histogram_macros.h"
#include "base/notimplemented.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "chrome/browser/performance_manager/mechanisms/working_set_trimmer.h"
#include "components/performance_manager/graph/graph_impl.h"
#include "components/performance_manager/graph/process_node_impl.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/node_attached_data.h"
#include "components/performance_manager/public/graph/node_data_describer_registry.h"
#include "components/performance_manager/public/graph/process_node.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "chrome/browser/performance_manager/policies/working_set_trimmer_policy_chromeos.h"
#endif
namespace performance_manager {
namespace policies {
namespace {
class WorkingSetTrimData
: public ExternalNodeAttachedDataImpl<WorkingSetTrimData> {
public:
explicit WorkingSetTrimData(const ProcessNode* node) {}
~WorkingSetTrimData() override = default;
base::TimeTicks last_trim_;
};
const char kDescriberName[] = "WorkingSetTrimmerPolicy";
} // namespace
WorkingSetTrimmerPolicy::WorkingSetTrimmerPolicy() = default;
WorkingSetTrimmerPolicy::~WorkingSetTrimmerPolicy() = default;
void WorkingSetTrimmerPolicy::OnPassedToGraph(Graph* graph) {
RegisterObservers(graph);
}
void WorkingSetTrimmerPolicy::OnTakenFromGraph(Graph* graph) {
UnregisterObservers(graph);
}
void WorkingSetTrimmerPolicy::OnAllFramesInProcessFrozen(
const ProcessNode* process_node) {
TrimWorkingSet(process_node);
}
void WorkingSetTrimmerPolicy::RegisterObservers(Graph* graph) {
graph->AddProcessNodeObserver(this);
graph->GetNodeDataDescriberRegistry()->RegisterDescriber(this,
kDescriberName);
}
void WorkingSetTrimmerPolicy::UnregisterObservers(Graph* graph) {
graph->GetNodeDataDescriberRegistry()->UnregisterDescriber(this);
graph->RemoveProcessNodeObserver(this);
}
base::TimeTicks WorkingSetTrimmerPolicy::GetLastTrimTime(
const ProcessNode* process_node) {
auto* data = WorkingSetTrimData::GetOrCreate(process_node);
return data->last_trim_;
}
void WorkingSetTrimmerPolicy::SetLastTrimTimeNow(
const ProcessNode* process_node) {
SetLastTrimTime(process_node, base::TimeTicks::Now());
}
void WorkingSetTrimmerPolicy::SetLastTrimTime(const ProcessNode* process_node,
base::TimeTicks time) {
auto* data = WorkingSetTrimData::GetOrCreate(process_node);
data->last_trim_ = time;
}
void WorkingSetTrimmerPolicy::TrimWorkingSet(const ProcessNode* process_node) {
auto* trimmer = mechanism::WorkingSetTrimmer::GetInstance();
DCHECK(trimmer);
if (process_node->GetProcess().IsValid()) {
SetLastTrimTimeNow(process_node);
trimmer->TrimWorkingSet(process_node);
}
}
base::Value::Dict WorkingSetTrimmerPolicy::DescribeProcessNodeData(
const ProcessNode* node) const {
auto* data = WorkingSetTrimData::Get(ProcessNodeImpl::FromNode(node));
if (data == nullptr)
return base::Value::Dict();
base::Value::Dict ret;
auto last_trim_age = base::TimeTicks::Now() - data->last_trim_;
ret.Set(
"last_trim",
base::Value(base::StrCat(
{base::NumberToString(last_trim_age.InSeconds()), " seconds ago"})));
return ret;
}
// static
bool WorkingSetTrimmerPolicy::PlatformSupportsWorkingSetTrim() {
#if BUILDFLAG(IS_CHROMEOS)
return WorkingSetTrimmerPolicyChromeOS::PlatformSupportsWorkingSetTrim();
#else
return false;
#endif
}
// static
std::unique_ptr<WorkingSetTrimmerPolicy>
WorkingSetTrimmerPolicy::CreatePolicyForPlatform() {
#if BUILDFLAG(IS_CHROMEOS)
return std::make_unique<WorkingSetTrimmerPolicyChromeOS>();
#else
NOTIMPLEMENTED() << "Platform does not support WorkingSetTrim.";
return nullptr;
#endif
}
} // namespace policies
} // namespace performance_manager
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