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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
#define CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
#include <stddef.h>
#include "base/containers/circular_deque.h"
#include "base/functional/callback.h"
#include "base/threading/thread_checker.h"
#include "content/public/common/resource_usage_reporter.mojom.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/common/web_cache/web_cache_resource_type_stats.h"
// Provides resource usage information about a child process.
//
// This is a wrapper around the content::mojom::ResourceUsageReporter Mojo
// service that exposes
// information about resources used by a child process. Currently, this is only
// V8 memory and Blink resource cache usage, but could be expanded to include
// other resources. This is intended for status viewers such as the task
// manager.
//
// To create:
// 1. Create a mojo::PendingRemote<content::mojom::ResourceUsageReporter> and
// obtain a mojo::PendingReceiver<> using InitWithNewPipeAndPassReceiver().
// 2. Use the child process's service registry to connect to the service using
// the mojo::PendingReceiver<>. Note, ServiceRegistry is thread hostile and
// must always be accessed from the same thread. However, PendingReceiver<>
// can be passed safely between threads, and therefore a task can be posted
// to the ServiceRegistry thread to connect to the remote service.
// 3. Pass the mojo::PendingRemote<content::mojom::ResourceUsageReporter> to the
// constructor.
//
// Example:
// void Foo::ConnectToService(
// mojo::PendingReceiver<content::mojom::ResourceUsageReporter>
// receiver) {
// content::ServiceRegistry* registry = host_->GetServiceRegistry();
// registry->ConnectToRemoteService(std::move(req));
// }
//
// ...
// mojo::PendingRemote<content::mojom::ResourceUsageReporter> service;
// mojo::PendingReceiver<content::mojom::ResourceUsageReporter> receiver =
// service.InitWithNewPipeAndPassReceiver();
// content::GetIOThreadTaskRunner({})->PostTask(
// FROM_HERE,
// base::BindOnce(&Foo::ConnectToService, this, std::move(receiver)));
// resource_usage_.reset(new ProcessResourceUsage(std::move(service)));
// ...
//
// Note: ProcessResourceUsage is thread-hostile and must live on a single
// thread.
class ProcessResourceUsage {
public:
// Must be called from the same thread that created |service|.
explicit ProcessResourceUsage(
mojo::PendingRemote<content::mojom::ResourceUsageReporter> service);
ProcessResourceUsage(const ProcessResourceUsage&) = delete;
ProcessResourceUsage& operator=(const ProcessResourceUsage&) = delete;
~ProcessResourceUsage();
// Refresh the resource usage information. |callback| is invoked when the
// usage data is updated, or when the IPC connection is lost.
void Refresh(base::OnceClosure callback);
// Get V8 memory usage information.
bool ReportsV8MemoryStats() const;
size_t GetV8MemoryAllocated() const;
size_t GetV8MemoryUsed() const;
// Get Blink resource cache information.
blink::WebCacheResourceTypeStats GetBlinkMemoryCacheStats() const;
private:
// Mojo IPC callback.
void OnRefreshDone(content::mojom::ResourceUsageDataPtr data);
void RunPendingRefreshCallbacks();
mojo::Remote<content::mojom::ResourceUsageReporter> service_;
bool update_in_progress_;
base::circular_deque<base::OnceClosure> refresh_callbacks_;
content::mojom::ResourceUsageDataPtr stats_;
base::ThreadChecker thread_checker_;
};
#endif // CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
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