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// Copyright 2023 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/ash/arc/memory_pressure/container_app_killer.h"
#include <algorithm> // For sort.
#include <vector>
#include "base/logging.h" // For LOG.
#include "base/process/process_metrics.h"
#include "chrome/browser/memory/memory_kills_monitor.h"
#include "chromeos/ash/experiences/arc/arc_util.h" // For IsArcVmEnabled.
#include "chromeos/ash/experiences/arc/mojom/process.mojom.h" // For arc::mojom::ProcessInstance.
#include "chromeos/ash/experiences/arc/session/arc_bridge_service.h"
#include "chromeos/ash/experiences/arc/session/arc_service_manager.h"
#include "content/public/browser/browser_thread.h"
namespace arc {
ContainerAppKiller::ContainerAppKiller() {
ash::ResourcedClient* client = ash::ResourcedClient::Get();
if (client) {
client->AddArcContainerObserver(this);
}
}
ContainerAppKiller::~ContainerAppKiller() {
ash::ResourcedClient* client = ash::ResourcedClient::Get();
if (client) {
client->RemoveArcContainerObserver(this);
}
}
void ContainerAppKiller::OnMemoryPressure(
ash::ResourcedClient::PressureLevelArcContainer level,
uint64_t reclaim_target_kb) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// ContainerAppKiller shall not be created when ARCVM is enabled.
DCHECK(!arc::IsArcVmEnabled());
arc::ArcProcessService* arc_process_service = arc::ArcProcessService::Get();
if (!arc_process_service) {
return;
}
// RequestAppProcessList() must be called in UI thread.
arc_process_service->RequestAppProcessList(
base::BindOnce(&ContainerAppKiller::LowMemoryKill,
weak_ptr_factory_.GetWeakPtr(), level, reclaim_target_kb));
}
void ContainerAppKiller::LowMemoryKill(
ash::ResourcedClient::PressureLevelArcContainer level,
uint64_t reclaim_target_kb,
ArcProcessService::OptionalArcProcessList arc_processes) {
if (!arc_processes) {
return;
}
// Don't kill persistent and focused ARC processes.
std::erase_if(*arc_processes, [](auto& proc) {
return proc.IsPersistent() || proc.is_focused();
});
bool is_critical_level =
(level == ash::ResourcedClient::PressureLevelArcContainer::kPerceptible ||
level == ash::ResourcedClient::PressureLevelArcContainer::kForeground);
// Don't kill background protected ARC processes on non-critical level.
if (!is_critical_level) {
std::erase_if(*arc_processes,
[](auto& proc) { return proc.IsBackgroundProtected(); });
}
if (arc_processes->empty()) {
return;
}
std::vector<KillCandidate> candidates = GetSortedCandidates(arc_processes);
base::TimeTicks now = base::TimeTicks::Now();
uint64_t total_freed_kb = 0;
for (KillCandidate& candidate : candidates) {
// If it's in critical memory pressure level, all non-protected processes
// should be freed, it would keep reclaiming until the candidate is
// protected.
if ((reclaim_target_kb <= total_freed_kb) &&
(!is_critical_level || candidate.is_protected())) {
break;
}
if (IsRecentlyKilled(candidate.process_name(), now)) {
LOG(WARNING) << "Avoided killing " << candidate.process_name()
<< " too often";
continue;
}
// Estimate the process memory usage before it's killed.
int estimated_memory_freed_kb = GetMemoryFootprintKB(candidate.pid());
if (KillArcProcess(candidate.nspid())) {
recently_killed_[candidate.process_name()] = now;
total_freed_kb += estimated_memory_freed_kb;
memory::MemoryKillsMonitor::LogLowMemoryKill("APP",
estimated_memory_freed_kb);
LOG(WARNING) << "Killed " << candidate.process_name()
<< ", pid: " << candidate.pid()
<< ", protected: " << candidate.is_protected() << ", "
<< estimated_memory_freed_kb << " KB freed";
} else {
LOG(ERROR) << "Failed to kill " << candidate.process_name()
<< ", pid:" << candidate.pid()
<< ", protected: " << candidate.is_protected();
}
}
if (is_critical_level) {
LOG(WARNING) << "Reclaim target(KB): " << reclaim_target_kb
<< ", estimated total freed(KB): " << total_freed_kb
<< " (All non-protected apps are reclaimed)";
} else {
LOG(WARNING) << "Reclaim target(KB): " << reclaim_target_kb
<< ", estimated total freed(KB): " << total_freed_kb;
}
}
std::vector<ContainerAppKiller::KillCandidate>
ContainerAppKiller::GetSortedCandidates(
const ArcProcessService::OptionalArcProcessList& arc_processes) {
std::vector<KillCandidate> candidates;
for (const auto& process : *arc_processes) {
candidates.emplace_back(&process);
}
std::sort(candidates.begin(), candidates.end());
return candidates;
}
bool ContainerAppKiller::IsRecentlyKilled(const std::string& process_name,
const base::TimeTicks& now) {
const auto it = recently_killed_.find(process_name);
if (it == recently_killed_.end()) {
return false;
}
return (now - it->second) <= kArcRespawnKillDelay;
}
uint64_t ContainerAppKiller::GetMemoryFootprintKB(base::ProcessId pid) {
auto process_metrics = base::ProcessMetrics::CreateProcessMetrics(pid);
auto info = process_metrics->GetMemoryInfo();
return info.has_value()
? (info->vm_swap_bytes + info->resident_set_bytes) / 1024
: 0;
}
bool ContainerAppKiller::KillArcProcess(base::ProcessId nspid) {
auto* arc_service_manager = arc::ArcServiceManager::Get();
if (!arc_service_manager) {
return false;
}
auto* arc_process_instance = ARC_GET_INSTANCE_FOR_METHOD(
arc_service_manager->arc_bridge_service()->process(), KillProcess);
if (!arc_process_instance) {
return false;
}
arc_process_instance->KillProcess(nspid, "LowMemoryKill");
return true;
}
} // namespace arc
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