blob: 2412ac940cd58d50d97efa684a721e7fd178d4ae [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include "base/callback.h"
#include "base/containers/circular_deque.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "content/public/common/resource_usage_reporter.mojom.h"
#include "third_party/blink/public/platform/web_cache.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 content::mojom::ResourceUsageReporterPtr and obtain an
// InterfaceRequest<>
// using
// mojo::MakeRequest.
// 2. Use the child process's service registry to connect to the service using
// the InterfaceRequest<>. Note, ServiceRegistry is thread hostile and
// must always be accessed from the same thread. However, InterfaceRequest<>
// 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 content::mojom::ResourceUsageReporterPtr to the constructor.
// Example:
// void Foo::ConnectToService(
// mojo::InterfaceRequest<content::mojom::ResourceUsageReporter> req) {
// content::ServiceRegistry* registry = host_->GetServiceRegistry();
// registry->ConnectToRemoteService(std::move(req));
// }
// ...
// content::mojom::ResourceUsageReporterPtr service;
// mojo::InterfaceRequest<content::mojom::ResourceUsageReporter> request =
// mojo::MakeRequest(&service);
// base::PostTaskWithTraits(
// FROM_HERE, {content::BrowserThread::IO},
// base::Bind(&Foo::ConnectToService, this, base::Passed(&request)));
// resource_usage_.reset(new ProcessResourceUsage(std::move(service)));
// ...
// Note: ProcessResourceUsage is thread-hostile and must live on a single
// thread.
class ProcessResourceUsage {
// Must be called from the same thread that created |service|.
explicit ProcessResourceUsage(
content::mojom::ResourceUsageReporterPtr service);
// Refresh the resource usage information. |callback| is invoked when the
// usage data is updated, or when the IPC connection is lost.
void Refresh(const base::Closure& callback);
// Get V8 memory usage information.
bool ReportsV8MemoryStats() const;
size_t GetV8MemoryAllocated() const;
size_t GetV8MemoryUsed() const;
// Get Blink resource cache information.
blink::WebCache::ResourceTypeStats GetWebCoreCacheStats() const;
// Mojo IPC callback.
void OnRefreshDone(content::mojom::ResourceUsageDataPtr data);
void RunPendingRefreshCallbacks();
content::mojom::ResourceUsageReporterPtr service_;
bool update_in_progress_;
base::circular_deque<base::Closure> refresh_callbacks_;
content::mojom::ResourceUsageDataPtr stats_;
base::ThreadChecker thread_checker_;