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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 "third_party/blink/renderer/controller/memory_saver_controller.h"
#include "base/system/sys_info.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/renderer/core/workers/worker_backing_thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/main_thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/main_thread_scheduler.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread_scheduler.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
namespace {
constexpr uint64_t kMB = 1024 * 1024;
} // namespace
void MemorySaverController::Initialize() {
DEFINE_STATIC_LOCAL(MemorySaverController, controller, ());
(void)controller;
}
MemorySaverController::MemorySaverController() {
MainThreadScheduler* scheduler =
Thread::MainThread()->Scheduler()->ToMainThreadScheduler();
DCHECK(scheduler);
sample_timer_.SetTaskRunner(scheduler->NonWakingTaskRunner());
if (base::SysInfo::AmountOfPhysicalMemory() >= 4000 * kMB) {
return;
}
if (base::FeatureList::IsEnabled(features::kMemorySaverModeRenderTuning)) {
sample_timer_.Start(FROM_HERE, base::Seconds(5), this,
&MemorySaverController::Sample);
}
}
void MemorySaverController::Sample() {
uint64_t available_ram = base::SysInfo::AmountOfAvailablePhysicalMemory();
if (available_ram < features::kAvailableMemoryThresholdParamMb.Get() * kMB) {
if (!memory_saver_enabled_) {
SetMemorySaverModeForAllIsolates(true);
memory_saver_enabled_ = true;
}
} else if (memory_saver_enabled_) {
SetMemorySaverModeForAllIsolates(false);
memory_saver_enabled_ = false;
}
}
void MemorySaverController::SetMemorySaverModeForAllIsolates(
bool memory_saver_mode_enabled) {
Thread::MainThread()
->Scheduler()
->ToMainThreadScheduler()
->ForEachMainThreadIsolate(WTF::BindRepeating(
[](bool memory_saver_mode_enabled, v8::Isolate* isolate) {
isolate->SetMemorySaverMode(memory_saver_mode_enabled);
},
memory_saver_mode_enabled));
WorkerBackingThread::SetMemorySaverModeForWorkerThreadIsolates(
memory_saver_mode_enabled);
}
} // namespace blink
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