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// Copyright 2020 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/userspace_swap_policy_chromeos.h"
#include "base/system/sys_info.h"
#include "base/time/time.h"
#include "chrome/browser/performance_manager/mechanisms/userspace_swap_chromeos.h"
#include "chromeos/ash/components/memory/userspace_swap/swap_storage.h"
#include "chromeos/ash/components/memory/userspace_swap/userspace_swap.h"
#include "components/performance_manager/public/graph/frame_node.h"
#include "components/performance_manager/public/graph/node_attached_data.h"
#include "components/performance_manager/public/graph/page_node.h"
#include "components/performance_manager/public/graph/process_node.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
namespace performance_manager {
namespace policies {
namespace {
using ::ash::memory::userspace_swap::SwapFile;
using ::ash::memory::userspace_swap::UserspaceSwapConfig;
class UserspaceSwapPolicyData
: public ExternalNodeAttachedDataImpl<UserspaceSwapPolicyData> {
public:
explicit UserspaceSwapPolicyData(const ProcessNode* node) {}
~UserspaceSwapPolicyData() override = default;
static UserspaceSwapPolicyData* EnsureForProcess(
const ProcessNode* process_node) {
return UserspaceSwapPolicyData::GetOrCreate(process_node);
}
bool initialization_attempted_ = false;
bool process_initialized_ = false;
base::TimeTicks last_swap_;
};
constexpr base::TimeDelta kMetricsInterval = base::Seconds(30);
} // namespace
UserspaceSwapPolicy::UserspaceSwapPolicy(const UserspaceSwapConfig& config)
: config_(config) {
// To avoid failures related to chromeos-linux, we validate that we're running
// on chromeos before enforcing the following check.
if (base::SysInfo::IsRunningOnChromeOS()) {
DCHECK(UserspaceSwapPolicy::UserspaceSwapSupportedAndEnabled());
}
if (VLOG_IS_ON(1) && !metrics_timer_->IsRunning()) {
metrics_timer_->Start(
FROM_HERE, kMetricsInterval,
base::BindRepeating(&UserspaceSwapPolicy::PrintAllSwapMetrics,
weak_factory_.GetWeakPtr()));
}
}
UserspaceSwapPolicy::UserspaceSwapPolicy()
: UserspaceSwapPolicy(UserspaceSwapConfig::Get()) {}
UserspaceSwapPolicy::~UserspaceSwapPolicy() = default;
void UserspaceSwapPolicy::OnPassedToGraph(Graph* graph) {
graph->AddProcessNodeObserver(this);
// Only handle the memory pressure notifications if the feature to swap on
// moderate pressure is enabled.
if (config_->swap_on_moderate_pressure) {
graph->AddSystemNodeObserver(this);
}
}
void UserspaceSwapPolicy::OnTakenFromGraph(Graph* graph) {
if (config_->swap_on_moderate_pressure) {
graph->RemoveSystemNodeObserver(this);
}
graph->RemoveProcessNodeObserver(this);
}
void UserspaceSwapPolicy::OnAllFramesInProcessFrozen(
const ProcessNode* process_node) {
if (config_->swap_on_freeze) {
// We don't provide a page node because the visibility requirements don't
// matter on freeze.
if (IsEligibleToSwap(process_node, nullptr)) {
VLOG(1) << "rphid: " << process_node->GetRenderProcessHostId()
<< " pid: " << process_node->GetProcessId() << " swap on freeze";
UserspaceSwapPolicyData::EnsureForProcess(process_node)->last_swap_ =
base::TimeTicks::Now();
SwapProcessNode(process_node);
}
}
}
void UserspaceSwapPolicy::OnProcessNodeAdded(const ProcessNode* process_node) {
// If data was still associated with this node make sure it's blown away and
// any existing file descriptors are closed.
if (UserspaceSwapPolicyData::Destroy(process_node)) {
DLOG(FATAL)
<< "ProcessNode had a UserspaceSwapPolicyData attached when added.";
}
}
bool UserspaceSwapPolicy::InitializeProcessNode(
const ProcessNode* process_node) {
// TODO(bgeffon): Add policy specific initialization or remove once final CLs
// land.
return true;
}
void UserspaceSwapPolicy::OnProcessLifetimeChange(
const ProcessNode* process_node) {
if (!process_node->GetProcess().IsValid()) {
return;
}
UserspaceSwapPolicyData* data =
UserspaceSwapPolicyData::EnsureForProcess(process_node);
if (!data->initialization_attempted_) {
data->initialization_attempted_ = true;
// If this fails we don't attempt swap ever.
data->process_initialized_ = InitializeProcessNode(process_node);
LOG_IF(ERROR, !data->process_initialized_)
<< "Unable to initialize process node";
}
}
base::TimeTicks UserspaceSwapPolicy::GetLastSwapTime(
const ProcessNode* process_node) {
return UserspaceSwapPolicyData::EnsureForProcess(process_node)->last_swap_;
}
void UserspaceSwapPolicy::OnMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel new_level) {
if (new_level == base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE) {
return;
}
auto now_ticks = base::TimeTicks::Now();
// Try not to walk the graph too frequently because we can receive moderate
// memory pressure notifications every 10s.
if (now_ticks - last_graph_walk_ < config_->graph_walk_frequency) {
return;
}
last_graph_walk_ = now_ticks;
SwapNodesOnGraph();
}
void UserspaceSwapPolicy::SwapNodesOnGraph() {
for (const PageNode* page_node : GetOwningGraph()->GetAllPageNodes()) {
// Check that we have a main frame.
const FrameNode* main_frame_node = page_node->GetMainFrameNode();
if (!main_frame_node)
continue;
const ProcessNode* process_node = main_frame_node->GetProcessNode();
if (IsEligibleToSwap(process_node, page_node)) {
VLOG(1) << "rphid: " << process_node->GetRenderProcessHostId()
<< " pid: " << process_node->GetProcessId()
<< " trigger swap for frame " << main_frame_node->GetURL();
UserspaceSwapPolicyData::EnsureForProcess(process_node)->last_swap_ =
base::TimeTicks::Now();
SwapProcessNode(process_node);
}
}
}
void UserspaceSwapPolicy::PrintAllSwapMetrics() {
uint64_t total_reclaimed = 0;
uint64_t total_on_disk = 0;
uint64_t total_renderers = 0;
for (const PageNode* page_node : GetOwningGraph()->GetAllPageNodes()) {
const FrameNode* main_frame_node = page_node->GetMainFrameNode();
if (!main_frame_node) {
continue;
}
const ProcessNode* process_node = main_frame_node->GetProcessNode();
auto now_ticks = base::TimeTicks::Now();
if (process_node && process_node->GetProcess().IsValid()) {
bool is_visible = page_node->IsVisible();
auto last_visibility_change =
now_ticks - page_node->GetLastVisibilityChangeTime();
auto url = main_frame_node->GetURL();
uint64_t memory_reclaimed = GetProcessNodeReclaimedBytes(process_node);
uint64_t disk_space_used = GetProcessNodeSwapFileUsageBytes(process_node);
total_on_disk += disk_space_used;
total_reclaimed += memory_reclaimed;
total_renderers++;
VLOG(1) << "Frame " << url << " visibile: " << is_visible
<< " last_chg: " << last_visibility_change
<< " last_swap: " << (now_ticks - GetLastSwapTime(process_node))
<< " reclaimed: " << (memory_reclaimed >> 10) << "Kb"
<< " on disk: " << (disk_space_used >> 10) << "Kb";
}
}
VLOG(1) << "Swap Summary, Renderers: " << total_renderers
<< " reclaimed: " << (total_reclaimed >> 10)
<< "Kb, total on disk: " << (total_on_disk >> 10) << "Kb"
<< " Backing Store free space: "
<< (GetSwapDeviceFreeSpaceBytes() >> 10) << "Kb";
}
void UserspaceSwapPolicy::SwapProcessNode(const ProcessNode* process_node) {
performance_manager::mechanism::userspace_swap::SwapProcessNode(process_node);
}
uint64_t UserspaceSwapPolicy::GetProcessNodeSwapFileUsageBytes(
const ProcessNode* process_node) {
return performance_manager::mechanism::userspace_swap::
GetProcessNodeSwapFileUsageBytes(process_node);
}
uint64_t UserspaceSwapPolicy::GetProcessNodeReclaimedBytes(
const ProcessNode* process_node) {
return performance_manager::mechanism::userspace_swap::
GetProcessNodeReclaimedBytes(process_node);
}
uint64_t UserspaceSwapPolicy::GetTotalSwapFileUsageBytes() {
return performance_manager::mechanism::userspace_swap::
GetTotalSwapFileUsageBytes();
}
uint64_t UserspaceSwapPolicy::GetSwapDeviceFreeSpaceBytes() {
return performance_manager::mechanism::userspace_swap::
GetSwapDeviceFreeSpaceBytes();
}
bool UserspaceSwapPolicy::IsPageNodeLoadingOrBusy(const PageNode* page_node) {
const PageNode::LoadingState loading_state = page_node->GetLoadingState();
return loading_state == PageNode::LoadingState::kLoading ||
loading_state == PageNode::LoadingState::kLoadedBusy;
}
bool UserspaceSwapPolicy::IsPageNodeAudible(const PageNode* page_node) {
return page_node->IsAudible();
}
bool UserspaceSwapPolicy::IsPageNodeVisible(const PageNode* page_node) {
return page_node->IsVisible();
}
base::TimeTicks UserspaceSwapPolicy::GetLastVisibilityChangeTime(
const PageNode* page_node) {
return page_node->GetLastVisibilityChangeTime();
}
bool UserspaceSwapPolicy::IsEligibleToSwap(const ProcessNode* process_node,
const PageNode* page_node) {
if (!process_node || !process_node->GetProcess().IsValid()) {
LOG(ERROR) << "Process node not valid";
return false;
}
auto* data = UserspaceSwapPolicyData::EnsureForProcess(process_node);
if (!data->process_initialized_) {
return false;
}
// Always check with the mechanism to make sure that it can still be swapped
// and that nothing unexpected has happened.
if (!performance_manager::mechanism::userspace_swap::IsEligibleToSwap(
process_node)) {
return false;
}
auto now_ticks = base::TimeTicks::Now();
// Don't swap a renderer too frequently.
auto time_since_last_swap = now_ticks - GetLastSwapTime(process_node);
if (time_since_last_swap < config_->process_swap_frequency) {
return false;
}
// If the caller provided a PageNode we will validate the visibility state of
// it.
if (page_node) {
// If we're loading, audible, or visible we will not swap.
if (IsPageNodeLoadingOrBusy(page_node) || IsPageNodeVisible(page_node) ||
IsPageNodeAudible(page_node)) {
return false;
}
// Next the page node must have been invisible for longer than the
// configured time.
if ((now_ticks - GetLastVisibilityChangeTime(page_node)) <
config_->invisible_time_before_swap) {
return false;
}
}
// To avoid hammering the system with fstat(2) system calls we will cache the
// available disk space for 30 seconds. But we only check if it's been
// configured to enforce a swap device minimum.
if (config_->minimum_swap_disk_space_available > 0) {
// Check if we can't swap because the device is running low on space.
if (GetSwapDeviceFreeSpaceBytes() <
config_->minimum_swap_disk_space_available) {
return false;
}
}
// Make sure we're not exceeding the total swap file usage across all
// renderers.
if (config_->maximum_swap_disk_space_bytes > 0) {
if (GetTotalSwapFileUsageBytes() >=
config_->maximum_swap_disk_space_bytes) {
return false;
}
}
// And make sure we're not exceeding the per-renderer swap file limit.
if (config_->renderer_maximum_disk_swap_file_size_bytes > 0) {
if (GetProcessNodeSwapFileUsageBytes(process_node) >=
config_->renderer_maximum_disk_swap_file_size_bytes) {
return false;
}
}
return true;
}
// Static
bool UserspaceSwapPolicy::UserspaceSwapSupportedAndEnabled() {
return ash::memory::userspace_swap::UserspaceSwapSupportedAndEnabled();
}
} // namespace policies
} // namespace performance_manager
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