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Diffstat (limited to 'dom/ipc/ProcessPriorityManager.cpp')
| -rw-r--r-- | dom/ipc/ProcessPriorityManager.cpp | 978 |
1 files changed, 978 insertions, 0 deletions
diff --git a/dom/ipc/ProcessPriorityManager.cpp b/dom/ipc/ProcessPriorityManager.cpp new file mode 100644 index 0000000000..060f17968a --- /dev/null +++ b/dom/ipc/ProcessPriorityManager.cpp @@ -0,0 +1,978 @@ +/* -*- 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/. */ + +#include "ProcessPriorityManager.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/BrowserHost.h" +#include "mozilla/dom/BrowserParent.h" +#include "mozilla/Hal.h" +#include "mozilla/IntegerPrintfMacros.h" +#include "mozilla/Preferences.h" +#include "mozilla/Services.h" +#include "mozilla/StaticPrefs_dom.h" +#include "mozilla/Telemetry.h" +#include "mozilla/Unused.h" +#include "mozilla/Logging.h" +#include "nsPrintfCString.h" +#include "nsXULAppAPI.h" +#include "nsFrameLoader.h" +#include "nsINamed.h" +#include "nsIObserverService.h" +#include "StaticPtr.h" +#include "nsIObserver.h" +#include "nsITimer.h" +#include "nsIPropertyBag2.h" +#include "nsComponentManagerUtils.h" +#include "nsCRT.h" +#include "nsTHashtable.h" +#include "nsQueryObject.h" + +using namespace mozilla; +using namespace mozilla::dom; +using namespace mozilla::hal; + +#ifdef XP_WIN +# include <process.h> +# define getpid _getpid +#else +# include <unistd.h> +#endif + +#ifdef LOG +# undef LOG +#endif + +// Use LOGP inside a ParticularProcessPriorityManager method; use LOG +// everywhere else. LOGP prints out information about the particular process +// priority manager. +// +// (Wow, our logging story is a huge mess.) + +// #define ENABLE_LOGGING 1 + +#if defined(ANDROID) && defined(ENABLE_LOGGING) +# include <android/log.h> +# define LOG(fmt, ...) \ + __android_log_print(ANDROID_LOG_INFO, "Gecko:ProcessPriorityManager", fmt, \ + ##__VA_ARGS__) +# define LOGP(fmt, ...) \ + __android_log_print( \ + ANDROID_LOG_INFO, "Gecko:ProcessPriorityManager", \ + "[%schild-id=%" PRIu64 ", pid=%d] " fmt, NameWithComma().get(), \ + static_cast<uint64_t>(ChildID()), Pid(), ##__VA_ARGS__) + +#elif defined(ENABLE_LOGGING) +# define LOG(fmt, ...) \ + printf("ProcessPriorityManager - " fmt "\n", ##__VA_ARGS__) +# define LOGP(fmt, ...) \ + printf("ProcessPriorityManager[%schild-id=%" PRIu64 ", pid=%d] - " fmt \ + "\n", \ + NameWithComma().get(), static_cast<uint64_t>(ChildID()), Pid(), \ + ##__VA_ARGS__) +#else +static LogModule* GetPPMLog() { + static LazyLogModule sLog("ProcessPriorityManager"); + return sLog; +} +# define LOG(fmt, ...) \ + MOZ_LOG(GetPPMLog(), LogLevel::Debug, \ + ("ProcessPriorityManager - " fmt, ##__VA_ARGS__)) +# define LOGP(fmt, ...) \ + MOZ_LOG(GetPPMLog(), LogLevel::Debug, \ + ("ProcessPriorityManager[%schild-id=%" PRIu64 ", pid=%d] - " fmt, \ + NameWithComma().get(), static_cast<uint64_t>(ChildID()), Pid(), \ + ##__VA_ARGS__)) +#endif + +namespace { + +class ParticularProcessPriorityManager; + +/** + * This singleton class does the work to implement the process priority manager + * in the main process. This class may not be used in child processes. (You + * can call StaticInit, but it won't do anything, and GetSingleton() will + * return null.) + * + * ProcessPriorityManager::CurrentProcessIsForeground() and + * ProcessPriorityManager::AnyProcessHasHighPriority() which can be called in + * any process, are handled separately, by the ProcessPriorityManagerChild + * class. + */ +class ProcessPriorityManagerImpl final : public nsIObserver, + public nsSupportsWeakReference { + public: + /** + * If we're in the main process, get the ProcessPriorityManagerImpl + * singleton. If we're in a child process, return null. + */ + static ProcessPriorityManagerImpl* GetSingleton(); + + static void StaticInit(); + static bool PrefsEnabled(); + static bool TestMode(); + + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER + + /** + * This function implements ProcessPriorityManager::SetProcessPriority. + */ + void SetProcessPriority(ContentParent* aContentParent, + ProcessPriority aPriority); + + /** + * If a magic testing-only pref is set, notify the observer service on the + * given topic with the given data. This is used for testing + */ + void FireTestOnlyObserverNotification(const char* aTopic, + const nsACString& aData = ""_ns); + + /** + * This must be called by a ParticularProcessPriorityManager when it changes + * its priority. + */ + void NotifyProcessPriorityChanged( + ParticularProcessPriorityManager* aParticularManager, + hal::ProcessPriority aOldPriority); + + void TabActivityChanged(BrowserParent* aBrowserParent, bool aIsActive); + + private: + static bool sPrefListenersRegistered; + static bool sInitialized; + static StaticRefPtr<ProcessPriorityManagerImpl> sSingleton; + + static void PrefChangedCallback(const char* aPref, void* aClosure); + + ProcessPriorityManagerImpl(); + ~ProcessPriorityManagerImpl(); + ProcessPriorityManagerImpl(const ProcessPriorityManagerImpl&) = delete; + + const ProcessPriorityManagerImpl& operator=( + const ProcessPriorityManagerImpl&) = delete; + + void Init(); + + already_AddRefed<ParticularProcessPriorityManager> + GetParticularProcessPriorityManager(ContentParent* aContentParent); + + void ObserveContentParentCreated(nsISupports* aContentParent); + void ObserveContentParentDestroyed(nsISupports* aSubject); + + nsDataHashtable<nsUint64HashKey, RefPtr<ParticularProcessPriorityManager> > + mParticularManagers; + + /** Contains the PIDs of child processes holding high-priority wakelocks */ + nsTHashtable<nsUint64HashKey> mHighPriorityChildIDs; +}; + +/** + * This singleton class implements the parts of the process priority manager + * that are available from all processes. + */ +class ProcessPriorityManagerChild final : public nsIObserver { + public: + static void StaticInit(); + static ProcessPriorityManagerChild* Singleton(); + + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER + + bool CurrentProcessIsForeground(); + + private: + static StaticRefPtr<ProcessPriorityManagerChild> sSingleton; + + ProcessPriorityManagerChild(); + ~ProcessPriorityManagerChild() = default; + ProcessPriorityManagerChild(const ProcessPriorityManagerChild&) = delete; + + const ProcessPriorityManagerChild& operator=( + const ProcessPriorityManagerChild&) = delete; + + void Init(); + + hal::ProcessPriority mCachedPriority; +}; + +/** + * This class manages the priority of one particular process. It is + * main-process only. + */ +class ParticularProcessPriorityManager final : public WakeLockObserver, + public nsIObserver, + public nsITimerCallback, + public nsINamed, + public nsSupportsWeakReference { + ~ParticularProcessPriorityManager(); + + public: + explicit ParticularProcessPriorityManager(ContentParent* aContentParent); + + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER + NS_DECL_NSITIMERCALLBACK + + virtual void Notify(const WakeLockInformation& aInfo) override; + void Init(); + + int32_t Pid() const; + uint64_t ChildID() const; + + /** + * Used in logging, this method returns the ContentParent's name followed by + * ", ". If we can't get the ContentParent's name for some reason, it + * returns an empty string. + * + * The reference returned here is guaranteed to be live until the next call + * to NameWithComma() or until the ParticularProcessPriorityManager is + * destroyed, whichever comes first. + */ + const nsAutoCString& NameWithComma(); + + void OnRemoteBrowserFrameShown(nsISupports* aSubject); + void OnBrowserParentDestroyed(nsISupports* aSubject); + + ProcessPriority CurrentPriority(); + ProcessPriority ComputePriority(); + + enum TimeoutPref { + BACKGROUND_PERCEIVABLE_GRACE_PERIOD, + BACKGROUND_GRACE_PERIOD, + }; + + void ScheduleResetPriority(TimeoutPref aTimeoutPref); + void ResetPriority(); + void ResetPriorityNow(); + void SetPriorityNow(ProcessPriority aPriority); + + void TabActivityChanged(BrowserParent* aBrowserParent, bool aIsActive); + + void ShutDown(); + + NS_IMETHOD GetName(nsACString& aName) override { + aName.AssignLiteral("ParticularProcessPriorityManager"); + return NS_OK; + } + + private: + void FireTestOnlyObserverNotification(const char* aTopic, + const nsACString& aData = ""_ns); + + void FireTestOnlyObserverNotification(const char* aTopic, + const char* aData = nullptr); + + bool IsHoldingWakeLock(const nsAString& aTopic); + + ContentParent* mContentParent; + uint64_t mChildID; + ProcessPriority mPriority; + bool mHoldsCPUWakeLock; + bool mHoldsHighPriorityWakeLock; + bool mHoldsPlayingAudioWakeLock; + bool mHoldsPlayingVideoWakeLock; + + /** + * Used to implement NameWithComma(). + */ + nsAutoCString mNameWithComma; + + nsCOMPtr<nsITimer> mResetPriorityTimer; + + // This hashtable contains the list of active TabId for this process. + nsTHashtable<nsUint64HashKey> mActiveBrowserParents; +}; + +/* static */ +bool ProcessPriorityManagerImpl::sInitialized = false; +/* static */ +bool ProcessPriorityManagerImpl::sPrefListenersRegistered = false; +/* static */ +StaticRefPtr<ProcessPriorityManagerImpl> ProcessPriorityManagerImpl::sSingleton; + +NS_IMPL_ISUPPORTS(ProcessPriorityManagerImpl, nsIObserver, + nsISupportsWeakReference); + +/* static */ +void ProcessPriorityManagerImpl::PrefChangedCallback(const char* aPref, + void* aClosure) { + StaticInit(); + if (!PrefsEnabled() && sSingleton) { + sSingleton = nullptr; + sInitialized = false; + } +} + +/* static */ +bool ProcessPriorityManagerImpl::PrefsEnabled() { + return StaticPrefs::dom_ipc_processPriorityManager_enabled() && + hal::SetProcessPrioritySupported() && + !StaticPrefs::dom_ipc_tabs_disabled(); +} + +/* static */ +bool ProcessPriorityManagerImpl::TestMode() { + return StaticPrefs::dom_ipc_processPriorityManager_testMode(); +} + +/* static */ +void ProcessPriorityManagerImpl::StaticInit() { + if (sInitialized) { + return; + } + + // The process priority manager is main-process only. + if (!XRE_IsParentProcess()) { + sInitialized = true; + return; + } + + // If IPC tabs aren't enabled at startup, don't bother with any of this. + if (!PrefsEnabled()) { + LOG("InitProcessPriorityManager bailing due to prefs."); + + // Run StaticInit() again if the prefs change. We don't expect this to + // happen in normal operation, but it happens during testing. + if (!sPrefListenersRegistered) { + sPrefListenersRegistered = true; + Preferences::RegisterCallback(PrefChangedCallback, + "dom.ipc.processPriorityManager.enabled"); + Preferences::RegisterCallback(PrefChangedCallback, + "dom.ipc.tabs.disabled"); + } + return; + } + + sInitialized = true; + + sSingleton = new ProcessPriorityManagerImpl(); + sSingleton->Init(); + ClearOnShutdown(&sSingleton); +} + +/* static */ +ProcessPriorityManagerImpl* ProcessPriorityManagerImpl::GetSingleton() { + if (!sSingleton) { + StaticInit(); + } + + return sSingleton; +} + +ProcessPriorityManagerImpl::ProcessPriorityManagerImpl() { + MOZ_ASSERT(XRE_IsParentProcess()); +} + +ProcessPriorityManagerImpl::~ProcessPriorityManagerImpl() = default; + +void ProcessPriorityManagerImpl::Init() { + LOG("Starting up. This is the parent process."); + + // The parent process's priority never changes; set it here and then forget + // about it. We'll manage only subprocesses' priorities using the process + // priority manager. + hal::SetProcessPriority(getpid(), PROCESS_PRIORITY_PARENT_PROCESS); + + nsCOMPtr<nsIObserverService> os = services::GetObserverService(); + if (os) { + os->AddObserver(this, "ipc:content-created", /* ownsWeak */ true); + os->AddObserver(this, "ipc:content-shutdown", /* ownsWeak */ true); + } +} + +NS_IMETHODIMP +ProcessPriorityManagerImpl::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + nsDependentCString topic(aTopic); + if (topic.EqualsLiteral("ipc:content-created")) { + ObserveContentParentCreated(aSubject); + } else if (topic.EqualsLiteral("ipc:content-shutdown")) { + ObserveContentParentDestroyed(aSubject); + } else { + MOZ_ASSERT(false); + } + + return NS_OK; +} + +already_AddRefed<ParticularProcessPriorityManager> +ProcessPriorityManagerImpl::GetParticularProcessPriorityManager( + ContentParent* aContentParent) { + uint64_t cpId = aContentParent->ChildID(); + auto entry = mParticularManagers.LookupForAdd(cpId); + RefPtr<ParticularProcessPriorityManager> pppm = + entry.OrInsert([aContentParent]() { + return new ParticularProcessPriorityManager(aContentParent); + }); + + if (!entry) { + // We created a new entry. + pppm->Init(); + FireTestOnlyObserverNotification("process-created", + nsPrintfCString("%" PRIu64, cpId)); + } + + return pppm.forget(); +} + +void ProcessPriorityManagerImpl::SetProcessPriority( + ContentParent* aContentParent, ProcessPriority aPriority) { + MOZ_ASSERT(aContentParent); + RefPtr<ParticularProcessPriorityManager> pppm = + GetParticularProcessPriorityManager(aContentParent); + if (pppm) { + pppm->SetPriorityNow(aPriority); + } +} + +void ProcessPriorityManagerImpl::ObserveContentParentCreated( + nsISupports* aContentParent) { + // Do nothing; it's sufficient to get the PPPM. But assign to nsRefPtr so we + // don't leak the already_AddRefed object. + RefPtr<ContentParent> cp = do_QueryObject(aContentParent); + RefPtr<ParticularProcessPriorityManager> pppm = + GetParticularProcessPriorityManager(cp); +} + +void ProcessPriorityManagerImpl::ObserveContentParentDestroyed( + nsISupports* aSubject) { + nsCOMPtr<nsIPropertyBag2> props = do_QueryInterface(aSubject); + NS_ENSURE_TRUE_VOID(props); + + uint64_t childID = CONTENT_PROCESS_ID_UNKNOWN; + props->GetPropertyAsUint64(u"childID"_ns, &childID); + NS_ENSURE_TRUE_VOID(childID != CONTENT_PROCESS_ID_UNKNOWN); + + if (auto entry = mParticularManagers.Lookup(childID)) { + entry.Data()->ShutDown(); + mHighPriorityChildIDs.RemoveEntry(childID); + entry.Remove(); + } +} + +void ProcessPriorityManagerImpl::NotifyProcessPriorityChanged( + ParticularProcessPriorityManager* aParticularManager, + ProcessPriority aOldPriority) { + ProcessPriority newPriority = aParticularManager->CurrentPriority(); + + if (newPriority >= PROCESS_PRIORITY_FOREGROUND_HIGH && + aOldPriority < PROCESS_PRIORITY_FOREGROUND_HIGH) { + mHighPriorityChildIDs.PutEntry(aParticularManager->ChildID()); + } else if (newPriority < PROCESS_PRIORITY_FOREGROUND_HIGH && + aOldPriority >= PROCESS_PRIORITY_FOREGROUND_HIGH) { + mHighPriorityChildIDs.RemoveEntry(aParticularManager->ChildID()); + } +} + +void ProcessPriorityManagerImpl::TabActivityChanged( + BrowserParent* aBrowserParent, bool aIsActive) { + RefPtr<ParticularProcessPriorityManager> pppm = + GetParticularProcessPriorityManager(aBrowserParent->Manager()); + if (!pppm) { + return; + } + + Telemetry::ScalarAdd( + Telemetry::ScalarID::DOM_CONTENTPROCESS_OS_PRIORITY_CHANGE_CONSIDERED, 1); + + pppm->TabActivityChanged(aBrowserParent, aIsActive); +} + +NS_IMPL_ISUPPORTS(ParticularProcessPriorityManager, nsIObserver, + nsITimerCallback, nsISupportsWeakReference, nsINamed); + +ParticularProcessPriorityManager::ParticularProcessPriorityManager( + ContentParent* aContentParent) + : mContentParent(aContentParent), + mChildID(aContentParent->ChildID()), + mPriority(PROCESS_PRIORITY_UNKNOWN), + mHoldsCPUWakeLock(false), + mHoldsHighPriorityWakeLock(false), + mHoldsPlayingAudioWakeLock(false), + mHoldsPlayingVideoWakeLock(false) { + MOZ_ASSERT(XRE_IsParentProcess()); + LOGP("Creating ParticularProcessPriorityManager."); +} + +void ParticularProcessPriorityManager::Init() { + RegisterWakeLockObserver(this); + + nsCOMPtr<nsIObserverService> os = services::GetObserverService(); + if (os) { + os->AddObserver(this, "remote-browser-shown", /* ownsWeak */ true); + os->AddObserver(this, "ipc:browser-destroyed", /* ownsWeak */ true); + } + + // This process may already hold the CPU lock; for example, our parent may + // have acquired it on our behalf. + mHoldsCPUWakeLock = IsHoldingWakeLock(u"cpu"_ns); + mHoldsHighPriorityWakeLock = IsHoldingWakeLock(u"high-priority"_ns); + mHoldsPlayingAudioWakeLock = IsHoldingWakeLock(u"audio-playing"_ns); + mHoldsPlayingVideoWakeLock = IsHoldingWakeLock(u"video-playing"_ns); + + LOGP( + "Done starting up. mHoldsCPUWakeLock=%d, " + "mHoldsHighPriorityWakeLock=%d, mHoldsPlayingAudioWakeLock=%d, " + "mHoldsPlayingVideoWakeLock=%d", + mHoldsCPUWakeLock, mHoldsHighPriorityWakeLock, mHoldsPlayingAudioWakeLock, + mHoldsPlayingVideoWakeLock); +} + +bool ParticularProcessPriorityManager::IsHoldingWakeLock( + const nsAString& aTopic) { + WakeLockInformation info; + GetWakeLockInfo(aTopic, &info); + return info.lockingProcesses().Contains(ChildID()); +} + +ParticularProcessPriorityManager::~ParticularProcessPriorityManager() { + LOGP("Destroying ParticularProcessPriorityManager."); + + // Unregister our wake lock observer if ShutDown hasn't been called. (The + // wake lock observer takes raw refs, so we don't want to take chances here!) + // We don't call UnregisterWakeLockObserver unconditionally because the code + // will print a warning if it's called unnecessarily. + + if (mContentParent) { + UnregisterWakeLockObserver(this); + } +} + +/* virtual */ +void ParticularProcessPriorityManager::Notify( + const WakeLockInformation& aInfo) { + if (!mContentParent) { + // We've been shut down. + return; + } + + bool* dest = nullptr; + if (aInfo.topic().EqualsLiteral("cpu")) { + dest = &mHoldsCPUWakeLock; + } else if (aInfo.topic().EqualsLiteral("high-priority")) { + dest = &mHoldsHighPriorityWakeLock; + } else if (aInfo.topic().EqualsLiteral("audio-playing")) { + dest = &mHoldsPlayingAudioWakeLock; + } else if (aInfo.topic().EqualsLiteral("video-playing")) { + dest = &mHoldsPlayingVideoWakeLock; + } + + if (dest) { + bool thisProcessLocks = aInfo.lockingProcesses().Contains(ChildID()); + if (thisProcessLocks != *dest) { + *dest = thisProcessLocks; + LOGP( + "Got wake lock changed event. " + "Now mHoldsCPUWakeLock=%d, mHoldsHighPriorityWakeLock=%d, " + "mHoldsPlayingAudioWakeLock=%d, mHoldsPlayingVideoWakeLock=%d", + mHoldsCPUWakeLock, mHoldsHighPriorityWakeLock, + mHoldsPlayingAudioWakeLock, mHoldsPlayingVideoWakeLock); + ResetPriority(); + } + } +} + +NS_IMETHODIMP +ParticularProcessPriorityManager::Observe(nsISupports* aSubject, + const char* aTopic, + const char16_t* aData) { + if (!mContentParent) { + // We've been shut down. + return NS_OK; + } + + nsDependentCString topic(aTopic); + + if (topic.EqualsLiteral("remote-browser-shown")) { + OnRemoteBrowserFrameShown(aSubject); + } else if (topic.EqualsLiteral("ipc:browser-destroyed")) { + OnBrowserParentDestroyed(aSubject); + } else { + MOZ_ASSERT(false); + } + + return NS_OK; +} + +uint64_t ParticularProcessPriorityManager::ChildID() const { + // We have to cache mContentParent->ChildID() instead of getting it from the + // ContentParent each time because after ShutDown() is called, mContentParent + // is null. If we didn't cache ChildID(), then we wouldn't be able to run + // LOGP() after ShutDown(). + return mChildID; +} + +int32_t ParticularProcessPriorityManager::Pid() const { + return mContentParent ? mContentParent->Pid() : -1; +} + +const nsAutoCString& ParticularProcessPriorityManager::NameWithComma() { + mNameWithComma.Truncate(); + if (!mContentParent) { + return mNameWithComma; // empty string + } + + nsAutoString name; + mContentParent->FriendlyName(name); + if (name.IsEmpty()) { + return mNameWithComma; // empty string + } + + CopyUTF16toUTF8(name, mNameWithComma); + mNameWithComma.AppendLiteral(", "); + return mNameWithComma; +} + +void ParticularProcessPriorityManager::OnRemoteBrowserFrameShown( + nsISupports* aSubject) { + RefPtr<nsFrameLoader> fl = do_QueryObject(aSubject); + NS_ENSURE_TRUE_VOID(fl); + + BrowserParent* tp = BrowserParent::GetFrom(fl); + NS_ENSURE_TRUE_VOID(tp); + + MOZ_ASSERT(XRE_IsParentProcess()); + if (tp->Manager() != mContentParent) { + return; + } + + // Ignore notifications that aren't from a Browser + if (fl->OwnerIsMozBrowserFrame()) { + ResetPriority(); + } + + nsCOMPtr<nsIObserverService> os = services::GetObserverService(); + if (os) { + os->RemoveObserver(this, "remote-browser-shown"); + } +} + +void ParticularProcessPriorityManager::OnBrowserParentDestroyed( + nsISupports* aSubject) { + nsCOMPtr<nsIRemoteTab> remoteTab = do_QueryInterface(aSubject); + NS_ENSURE_TRUE_VOID(remoteTab); + BrowserHost* browserHost = BrowserHost::GetFrom(remoteTab.get()); + + MOZ_ASSERT(XRE_IsParentProcess()); + if (browserHost->GetContentParent() && + browserHost->GetContentParent() != mContentParent) { + return; + } + + mActiveBrowserParents.RemoveEntry(browserHost->GetTabId()); + + ResetPriority(); +} + +void ParticularProcessPriorityManager::ResetPriority() { + ProcessPriority processPriority = ComputePriority(); + if (mPriority == PROCESS_PRIORITY_UNKNOWN || mPriority > processPriority) { + // Apps set at a perceivable background priority are often playing media. + // Most media will have short gaps while changing tracks between songs, + // switching videos, etc. Give these apps a longer grace period so they + // can get their next track started, if there is one, before getting + // downgraded. + if (mPriority == PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) { + ScheduleResetPriority(BACKGROUND_PERCEIVABLE_GRACE_PERIOD); + } else { + ScheduleResetPriority(BACKGROUND_GRACE_PERIOD); + } + return; + } + + SetPriorityNow(processPriority); +} + +void ParticularProcessPriorityManager::ResetPriorityNow() { + SetPriorityNow(ComputePriority()); +} + +void ParticularProcessPriorityManager::ScheduleResetPriority( + TimeoutPref aTimeoutPref) { + if (mResetPriorityTimer) { + LOGP("ScheduleResetPriority bailing; the timer is already running."); + return; + } + + uint32_t timeout = 0; + switch (aTimeoutPref) { + case BACKGROUND_PERCEIVABLE_GRACE_PERIOD: + timeout = StaticPrefs:: + dom_ipc_processPriorityManager_backgroundPerceivableGracePeriodMS(); + break; + case BACKGROUND_GRACE_PERIOD: + timeout = + StaticPrefs::dom_ipc_processPriorityManager_backgroundGracePeriodMS(); + break; + default: + MOZ_ASSERT(false, "Unrecognized timeout pref"); + break; + } + + LOGP("Scheduling reset timer to fire in %dms.", timeout); + NS_NewTimerWithCallback(getter_AddRefs(mResetPriorityTimer), this, timeout, + nsITimer::TYPE_ONE_SHOT); +} + +NS_IMETHODIMP +ParticularProcessPriorityManager::Notify(nsITimer* aTimer) { + LOGP("Reset priority timer callback; about to ResetPriorityNow."); + ResetPriorityNow(); + mResetPriorityTimer = nullptr; + return NS_OK; +} + +ProcessPriority ParticularProcessPriorityManager::CurrentPriority() { + return mPriority; +} + +ProcessPriority ParticularProcessPriorityManager::ComputePriority() { + if (!mActiveBrowserParents.IsEmpty() || + mContentParent->GetRemoteType() == EXTENSION_REMOTE_TYPE || + mHoldsPlayingAudioWakeLock) { + return PROCESS_PRIORITY_FOREGROUND; + } + + if (mHoldsCPUWakeLock || mHoldsHighPriorityWakeLock || + mHoldsPlayingVideoWakeLock) { + return PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE; + } + + return PROCESS_PRIORITY_BACKGROUND; +} + +void ParticularProcessPriorityManager::SetPriorityNow( + ProcessPriority aPriority) { + if (aPriority == PROCESS_PRIORITY_UNKNOWN) { + MOZ_ASSERT(false); + return; + } + + if (!ProcessPriorityManagerImpl::PrefsEnabled() || !mContentParent || + mPriority == aPriority) { + return; + } + + if (mPriority == aPriority) { + hal::SetProcessPriority(Pid(), mPriority); + return; + } + + LOGP("Changing priority from %s to %s.", ProcessPriorityToString(mPriority), + ProcessPriorityToString(aPriority)); + + ProcessPriority oldPriority = mPriority; + + mPriority = aPriority; + + // We skip incrementing the DOM_CONTENTPROCESS_OS_PRIORITY_RAISED if we're + // transitioning from the PROCESS_PRIORITY_UNKNOWN level, which is where + // we initialize at. + if (oldPriority < mPriority && oldPriority != PROCESS_PRIORITY_UNKNOWN) { + Telemetry::ScalarAdd( + Telemetry::ScalarID::DOM_CONTENTPROCESS_OS_PRIORITY_RAISED, 1); + } else if (oldPriority > mPriority) { + Telemetry::ScalarAdd( + Telemetry::ScalarID::DOM_CONTENTPROCESS_OS_PRIORITY_LOWERED, 1); + } + + hal::SetProcessPriority(Pid(), mPriority); + + if (oldPriority != mPriority) { + ProcessPriorityManagerImpl::GetSingleton()->NotifyProcessPriorityChanged( + this, oldPriority); + + Unused << mContentParent->SendNotifyProcessPriorityChanged(mPriority); + } + + FireTestOnlyObserverNotification("process-priority-set", + ProcessPriorityToString(mPriority)); +} + +void ParticularProcessPriorityManager::TabActivityChanged( + BrowserParent* aBrowserParent, bool aIsActive) { + MOZ_ASSERT(aBrowserParent); + + if (!aIsActive) { + mActiveBrowserParents.RemoveEntry(aBrowserParent->GetTabId()); + } else { + mActiveBrowserParents.PutEntry(aBrowserParent->GetTabId()); + } + + ResetPriority(); +} + +void ParticularProcessPriorityManager::ShutDown() { + MOZ_ASSERT(mContentParent); + + LOGP("shutdown for %p (mContentParent %p)", this, mContentParent); + + UnregisterWakeLockObserver(this); + + if (mResetPriorityTimer) { + mResetPriorityTimer->Cancel(); + mResetPriorityTimer = nullptr; + } + + mContentParent = nullptr; +} + +void ProcessPriorityManagerImpl::FireTestOnlyObserverNotification( + const char* aTopic, const nsACString& aData /* = ""_ns */) { + if (!TestMode()) { + return; + } + + nsCOMPtr<nsIObserverService> os = services::GetObserverService(); + NS_ENSURE_TRUE_VOID(os); + + nsPrintfCString topic("process-priority-manager:TEST-ONLY:%s", aTopic); + + LOG("Notifying observer %s, data %s", topic.get(), + PromiseFlatCString(aData).get()); + os->NotifyObservers(nullptr, topic.get(), NS_ConvertUTF8toUTF16(aData).get()); +} + +void ParticularProcessPriorityManager::FireTestOnlyObserverNotification( + const char* aTopic, const char* aData /* = nullptr */) { + if (!ProcessPriorityManagerImpl::TestMode()) { + return; + } + + nsAutoCString data; + if (aData) { + data.AppendASCII(aData); + } + + FireTestOnlyObserverNotification(aTopic, data); +} + +void ParticularProcessPriorityManager::FireTestOnlyObserverNotification( + const char* aTopic, const nsACString& aData /* = ""_ns */) { + if (!ProcessPriorityManagerImpl::TestMode()) { + return; + } + + nsAutoCString data(nsPrintfCString("%" PRIu64, ChildID())); + if (!aData.IsEmpty()) { + data.Append(':'); + data.Append(aData); + } + + // ProcessPriorityManagerImpl::GetSingleton() is guaranteed not to return + // null, since ProcessPriorityManagerImpl is the only class which creates + // ParticularProcessPriorityManagers. + + ProcessPriorityManagerImpl::GetSingleton()->FireTestOnlyObserverNotification( + aTopic, data); +} + +StaticRefPtr<ProcessPriorityManagerChild> + ProcessPriorityManagerChild::sSingleton; + +/* static */ +void ProcessPriorityManagerChild::StaticInit() { + if (!sSingleton) { + sSingleton = new ProcessPriorityManagerChild(); + sSingleton->Init(); + ClearOnShutdown(&sSingleton); + } +} + +/* static */ +ProcessPriorityManagerChild* ProcessPriorityManagerChild::Singleton() { + StaticInit(); + return sSingleton; +} + +NS_IMPL_ISUPPORTS(ProcessPriorityManagerChild, nsIObserver) + +ProcessPriorityManagerChild::ProcessPriorityManagerChild() { + if (XRE_IsParentProcess()) { + mCachedPriority = PROCESS_PRIORITY_PARENT_PROCESS; + } else { + mCachedPriority = PROCESS_PRIORITY_UNKNOWN; + } +} + +void ProcessPriorityManagerChild::Init() { + // The process priority should only be changed in child processes; don't even + // bother listening for changes if we're in the main process. + if (!XRE_IsParentProcess()) { + nsCOMPtr<nsIObserverService> os = services::GetObserverService(); + NS_ENSURE_TRUE_VOID(os); + os->AddObserver(this, "ipc:process-priority-changed", /* weak = */ false); + } +} + +NS_IMETHODIMP +ProcessPriorityManagerChild::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + MOZ_ASSERT(!strcmp(aTopic, "ipc:process-priority-changed")); + + nsCOMPtr<nsIPropertyBag2> props = do_QueryInterface(aSubject); + NS_ENSURE_TRUE(props, NS_OK); + + int32_t priority = static_cast<int32_t>(PROCESS_PRIORITY_UNKNOWN); + props->GetPropertyAsInt32(u"priority"_ns, &priority); + NS_ENSURE_TRUE(ProcessPriority(priority) != PROCESS_PRIORITY_UNKNOWN, NS_OK); + + mCachedPriority = static_cast<ProcessPriority>(priority); + + return NS_OK; +} + +bool ProcessPriorityManagerChild::CurrentProcessIsForeground() { + return mCachedPriority == PROCESS_PRIORITY_UNKNOWN || + mCachedPriority >= PROCESS_PRIORITY_FOREGROUND; +} + +} // namespace + +namespace mozilla { + +/* static */ +void ProcessPriorityManager::Init() { + ProcessPriorityManagerImpl::StaticInit(); + ProcessPriorityManagerChild::StaticInit(); +} + +/* static */ +void ProcessPriorityManager::SetProcessPriority(ContentParent* aContentParent, + ProcessPriority aPriority) { + MOZ_ASSERT(aContentParent); + MOZ_ASSERT(aContentParent->Pid() != -1); + + ProcessPriorityManagerImpl* singleton = + ProcessPriorityManagerImpl::GetSingleton(); + if (singleton) { + singleton->SetProcessPriority(aContentParent, aPriority); + } +} + +/* static */ +bool ProcessPriorityManager::CurrentProcessIsForeground() { + return ProcessPriorityManagerChild::Singleton()->CurrentProcessIsForeground(); +} + +/* static */ +void ProcessPriorityManager::TabActivityChanged(BrowserParent* aBrowserParent, + bool aIsActive) { + MOZ_ASSERT(aBrowserParent); + + ProcessPriorityManagerImpl* singleton = + ProcessPriorityManagerImpl::GetSingleton(); + if (!singleton) { + return; + } + + singleton->TabActivityChanged(aBrowserParent, aIsActive); +} + +} // namespace mozilla |