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/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#include "LoadManager.h"
#include "LoadMonitor.h"
#include "nsString.h"
#include "mozilla/Logging.h"
#include "prtime.h"
#include "prinrval.h"
#include "prsystem.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsReadableUtils.h"
#include "nsIObserverService.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ArrayUtils.h"
// MOZ_LOG=LoadManager:5
mozilla::LazyLogModule gLoadManagerLog("LoadManager");
#undef LOG
#undef LOG_ENABLED
#define LOG(args) MOZ_LOG(gLoadManagerLog, mozilla::LogLevel::Debug, args)
#define LOG_ENABLED() MOZ_LOG_TEST(gLoadManagerLog, mozilla::LogLevel::Verbose)
namespace mozilla {
/* static */ StaticRefPtr<LoadManagerSingleton> LoadManagerSingleton::sSingleton;
NS_IMPL_ISUPPORTS(LoadManagerSingleton, nsIObserver)
LoadManagerSingleton::LoadManagerSingleton(bool aEncoderOnly,
int aLoadMeasurementInterval,
int aAveragingMeasurements,
float aHighLoadThreshold,
float aLowLoadThreshold)
: mLock("LoadManager"),
mCurrentState(webrtc::kLoadNormal),
mOveruseActive(false),
mLoadSum(0.0f),
mLoadSumMeasurements(0),
mLoadMeasurementInterval(aLoadMeasurementInterval),
mAveragingMeasurements(aAveragingMeasurements),
mHighLoadThreshold(aHighLoadThreshold),
mLowLoadThreshold(aLowLoadThreshold)
{
LOG(("LoadManager - Initializing (%dms x %d, %f, %f)",
mLoadMeasurementInterval, mAveragingMeasurements,
mHighLoadThreshold, mLowLoadThreshold));
MOZ_ASSERT(mHighLoadThreshold > mLowLoadThreshold);
if (!aEncoderOnly) {
mLoadMonitor = new LoadMonitor(mLoadMeasurementInterval);
mLoadMonitor->Init(mLoadMonitor);
mLoadMonitor->SetLoadChangeCallback(this);
}
mLastStateChange = TimeStamp::Now();
for (auto &in_state : mTimeInState) {
in_state = 0;
}
}
LoadManagerSingleton::~LoadManagerSingleton()
{
LOG(("LoadManager: shutting down LoadMonitor"));
MOZ_ASSERT(!mLoadMonitor, "why wasn't the LoadMonitor shut down in xpcom-shutdown?");
if (mLoadMonitor) {
mLoadMonitor->Shutdown();
}
}
nsresult
LoadManagerSingleton::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData)
{
NS_ASSERTION(NS_IsMainThread(), "Observer invoked off the main thread");
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (!strcmp(aTopic, "xpcom-shutdown")) {
obs->RemoveObserver(this, "xpcom-shutdown");
{
MutexAutoLock lock(mLock);
mObservers.Clear();
}
if (mLoadMonitor) {
mLoadMonitor->Shutdown();
mLoadMonitor = nullptr;
}
LOG(("Releasing LoadManager singleton and thread"));
// Note: won't be released immediately as the Observer has a ref to us
sSingleton = nullptr;
}
return NS_OK;
}
void
LoadManagerSingleton::LoadChanged(float aSystemLoad, float aProcesLoad)
{
MutexAutoLock lock(mLock);
// Update total load, and total amount of measured seconds.
mLoadSum += aSystemLoad;
mLoadSumMeasurements++;
if (mLoadSumMeasurements >= mAveragingMeasurements) {
double averagedLoad = mLoadSum / (float)mLoadSumMeasurements;
webrtc::CPULoadState newState = mCurrentState;
if (mOveruseActive || averagedLoad > mHighLoadThreshold) {
LOG(("LoadManager - LoadStressed"));
newState = webrtc::kLoadStressed;
} else if (averagedLoad < mLowLoadThreshold) {
LOG(("LoadManager - LoadRelaxed"));
newState = webrtc::kLoadRelaxed;
} else {
LOG(("LoadManager - LoadNormal"));
newState = webrtc::kLoadNormal;
}
if (newState != mCurrentState) {
LoadHasChanged(newState);
}
mLoadSum = 0;
mLoadSumMeasurements = 0;
}
}
void
LoadManagerSingleton::OveruseDetected()
{
LOG(("LoadManager - Overuse Detected"));
MutexAutoLock lock(mLock);
mOveruseActive = true;
if (mCurrentState != webrtc::kLoadStressed) {
LoadHasChanged(webrtc::kLoadStressed);
}
}
void
LoadManagerSingleton::NormalUsage()
{
LOG(("LoadManager - Overuse finished"));
MutexAutoLock lock(mLock);
mOveruseActive = false;
}
void
LoadManagerSingleton::LoadHasChanged(webrtc::CPULoadState aNewState)
{
mLock.AssertCurrentThreadOwns();
LOG(("LoadManager - Signaling LoadHasChanged from %d to %d to %d listeners",
mCurrentState, aNewState, mObservers.Length()));
// Record how long we spent in this state for later Telemetry or display
TimeStamp now = TimeStamp::Now();
mTimeInState[mCurrentState] += (now - mLastStateChange).ToMilliseconds();
mLastStateChange = now;
mCurrentState = aNewState;
for (size_t i = 0; i < mObservers.Length(); i++) {
mObservers.ElementAt(i)->onLoadStateChanged(mCurrentState);
}
}
void
LoadManagerSingleton::AddObserver(webrtc::CPULoadStateObserver * aObserver)
{
LOG(("LoadManager - Adding Observer"));
MutexAutoLock lock(mLock);
mObservers.AppendElement(aObserver);
}
void
LoadManagerSingleton::RemoveObserver(webrtc::CPULoadStateObserver * aObserver)
{
LOG(("LoadManager - Removing Observer"));
MutexAutoLock lock(mLock);
if (!mObservers.RemoveElement(aObserver)) {
LOG(("LoadManager - Element to remove not found"));
}
if (mObservers.Length() == 0) {
// Record how long we spent in the final state for later Telemetry or display
TimeStamp now = TimeStamp::Now();
mTimeInState[mCurrentState] += (now - mLastStateChange).ToMilliseconds();
float total = 0;
for (size_t i = 0; i < MOZ_ARRAY_LENGTH(mTimeInState); i++) {
total += mTimeInState[i];
}
// Don't include short calls; we don't have reasonable load data, and
// such short calls rarely reach a stable state. Keep relatively
// short calls separate from longer ones
bool log = total > 5*PR_MSEC_PER_SEC;
bool small = log && total < 30*PR_MSEC_PER_SEC;
if (log) {
// Note: We don't care about rounding here; thus total may be < 100
Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_RELAXED_SHORT :
Telemetry::WEBRTC_LOAD_STATE_RELAXED,
(uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadRelaxed]/total * 100));
Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_NORMAL_SHORT :
Telemetry::WEBRTC_LOAD_STATE_NORMAL,
(uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadNormal]/total * 100));
Telemetry::Accumulate(small ? Telemetry::WEBRTC_LOAD_STATE_STRESSED_SHORT :
Telemetry::WEBRTC_LOAD_STATE_STRESSED,
(uint32_t) (mTimeInState[webrtc::CPULoadState::kLoadStressed]/total * 100));
}
for (auto &in_state : mTimeInState) {
in_state = 0;
}
if (mLoadMonitor) {
// Dance to avoid deadlock on mLock!
RefPtr<LoadMonitor> loadMonitor = mLoadMonitor.forget();
MutexAutoUnlock unlock(mLock);
loadMonitor->Shutdown();
}
}
}
}
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