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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_MemoryTelemetry_h
#define mozilla_MemoryTelemetry_h
#include "mozilla/TimeStamp.h"
#include "mozilla/Result.h"
#include "nsIObserver.h"
#include "nsITimer.h"
#include "nsTArray.h"
#include "nsWeakReference.h"
#include <functional>
class nsIEventTarget;
namespace mozilla {
namespace ipc {
enum class ResponseRejectReason;
}
/**
* Periodically gathers memory usage metrics after cycle collection, and
* populates telemetry histograms with their values.
*/
class MemoryTelemetry final : public nsIObserver,
public nsSupportsWeakReference {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
static MemoryTelemetry& Get();
nsresult GatherReports(
const std::function<void()>& aCompletionCallback = nullptr);
void GetUniqueSetSize(std::function<void(const int64_t&)>&& aCallback);
/**
* Does expensive initialization, which should happen only after startup has
* completed, and the event loop is idle.
*/
nsresult DelayedInit();
nsresult Shutdown();
private:
MemoryTelemetry();
~MemoryTelemetry() = default;
void Init();
static Result<uint32_t, nsresult> GetOpenTabsCount();
class TotalMemoryGatherer final : public nsITimerCallback {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
TotalMemoryGatherer() = default;
void CollectParentSize(int64_t aResident);
void CollectResult(int64_t aChildUSS);
void OnFailure(ipc::ResponseRejectReason aReason);
void Begin(nsIEventTarget* aThreadPool);
private:
~TotalMemoryGatherer() = default;
nsresult MaybeFinish();
nsCOMPtr<nsITimer> mTimeout;
nsTArray<int64_t> mChildSizes;
int64_t mTotalMemory = 0;
uint32_t mRemainingChildCount = 0;
bool mHaveParentSize = false;
};
nsCOMPtr<nsIEventTarget> mThreadPool;
RefPtr<TotalMemoryGatherer> mTotalMemoryGatherer;
TimeStamp mLastPoll{};
};
} // namespace mozilla
#endif // defined mozilla_MemoryTelemetry_h
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