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gecko-dev/dom/ipc/ProcessPriorityManager.cpp

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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/. */
#include "ProcessPriorityManager.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/Hal.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.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 "nsIMozBrowserFrame.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 = EmptyCString());
/**
* This must be called by a ParticularProcessPriorityManager when it changes
* its priority.
*/
void NotifyProcessPriorityChanged(
ParticularProcessPriorityManager* aParticularManager,
hal::ProcessPriority aOldPriority);
void TabActivityChanged(TabParent* aTabParent, bool aIsActive);
private:
static bool sPrefsEnabled;
static bool sRemoteTabsDisabled;
static bool sTestMode;
static bool sPrefListenersRegistered;
static bool sInitialized;
static StaticRefPtr<ProcessPriorityManagerImpl> sSingleton;
static void PrefChangedCallback(const char* aPref, void* aClosure);
ProcessPriorityManagerImpl();
~ProcessPriorityManagerImpl();
DISALLOW_EVIL_CONSTRUCTORS(ProcessPriorityManagerImpl);
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() {}
DISALLOW_EVIL_CONSTRUCTORS(ProcessPriorityManagerChild);
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;
static void StaticInit();
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 OnTabParentDestroyed(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(TabParent* aTabParent, bool aIsActive);
void ShutDown();
NS_IMETHOD GetName(nsACString& aName) override {
aName.AssignLiteral("ParticularProcessPriorityManager");
return NS_OK;
}
private:
static uint32_t sBackgroundPerceivableGracePeriodMS;
static uint32_t sBackgroundGracePeriodMS;
void FireTestOnlyObserverNotification(
const char* aTopic, const nsACString& aData = EmptyCString());
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> mActiveTabParents;
};
/* static */
bool ProcessPriorityManagerImpl::sInitialized = false;
/* static */
bool ProcessPriorityManagerImpl::sPrefsEnabled = false;
/* static */
bool ProcessPriorityManagerImpl::sRemoteTabsDisabled = true;
/* static */
bool ProcessPriorityManagerImpl::sTestMode = false;
/* static */
bool ProcessPriorityManagerImpl::sPrefListenersRegistered = false;
/* static */
StaticRefPtr<ProcessPriorityManagerImpl> ProcessPriorityManagerImpl::sSingleton;
/* static */
uint32_t ParticularProcessPriorityManager::sBackgroundPerceivableGracePeriodMS =
0;
/* static */
uint32_t ParticularProcessPriorityManager::sBackgroundGracePeriodMS = 0;
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 sPrefsEnabled && hal::SetProcessPrioritySupported() &&
!sRemoteTabsDisabled;
}
/* static */
bool ProcessPriorityManagerImpl::TestMode() { return sTestMode; }
/* static */
void ProcessPriorityManagerImpl::StaticInit() {
if (sInitialized) {
return;
}
// The process priority manager is main-process only.
if (!XRE_IsParentProcess()) {
sInitialized = true;
return;
}
if (!sPrefListenersRegistered) {
Preferences::AddBoolVarCache(&sPrefsEnabled,
"dom.ipc.processPriorityManager.enabled");
Preferences::AddBoolVarCache(&sRemoteTabsDisabled, "dom.ipc.tabs.disabled");
Preferences::AddBoolVarCache(&sTestMode,
"dom.ipc.processPriorityManager.testMode");
}
// 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 master process.");
// The master 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_MASTER);
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(NS_LITERAL_STRING("childID"), &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(TabParent* aTabParent,
bool aIsActive) {
RefPtr<ParticularProcessPriorityManager> pppm =
GetParticularProcessPriorityManager(aTabParent->Manager());
if (!pppm) {
return;
}
pppm->TabActivityChanged(aTabParent, 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::StaticInit() {
Preferences::AddUintVarCache(
&sBackgroundPerceivableGracePeriodMS,
"dom.ipc.processPriorityManager.backgroundPerceivableGracePeriodMS");
Preferences::AddUintVarCache(
&sBackgroundGracePeriodMS,
"dom.ipc.processPriorityManager.backgroundGracePeriodMS");
}
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(NS_LITERAL_STRING("cpu"));
mHoldsHighPriorityWakeLock =
IsHoldingWakeLock(NS_LITERAL_STRING("high-priority"));
mHoldsPlayingAudioWakeLock =
IsHoldingWakeLock(NS_LITERAL_STRING("audio-playing"));
mHoldsPlayingVideoWakeLock =
IsHoldingWakeLock(NS_LITERAL_STRING("video-playing"));
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")) {
OnTabParentDestroyed(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
}
mNameWithComma = NS_ConvertUTF16toUTF8(name);
mNameWithComma.AppendLiteral(", ");
return mNameWithComma;
}
void ParticularProcessPriorityManager::OnRemoteBrowserFrameShown(
nsISupports* aSubject) {
RefPtr<nsFrameLoader> fl = do_QueryObject(aSubject);
NS_ENSURE_TRUE_VOID(fl);
TabParent* tp = TabParent::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::OnTabParentDestroyed(
nsISupports* aSubject) {
nsCOMPtr<nsITabParent> tp = do_QueryInterface(aSubject);
NS_ENSURE_TRUE_VOID(tp);
MOZ_ASSERT(XRE_IsParentProcess());
if (TabParent::GetFrom(tp)->Manager() != mContentParent) {
return;
}
uint64_t tabId;
if (NS_WARN_IF(NS_FAILED(tp->GetTabId(&tabId)))) {
return;
}
mActiveTabParents.RemoveEntry(tabId);
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 = sBackgroundPerceivableGracePeriodMS;
break;
case BACKGROUND_GRACE_PERIOD:
timeout = sBackgroundGracePeriodMS;
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 (!mActiveTabParents.IsEmpty() ||
mContentParent->GetRemoteType().EqualsLiteral(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;
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(TabParent* aTabParent,
bool aIsActive) {
MOZ_ASSERT(aTabParent);
if (!aIsActive) {
mActiveTabParents.RemoveEntry(aTabParent->GetTabId());
} else {
mActiveTabParents.PutEntry(aTabParent->GetTabId());
}
ResetPriority();
}
void ParticularProcessPriorityManager::ShutDown() {
MOZ_ASSERT(mContentParent);
UnregisterWakeLockObserver(this);
if (mResetPriorityTimer) {
mResetPriorityTimer->Cancel();
mResetPriorityTimer = nullptr;
}
mContentParent = nullptr;
}
void ProcessPriorityManagerImpl::FireTestOnlyObserverNotification(
const char* aTopic, const nsACString& aData /* = EmptyCString() */) {
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 /* = EmptyCString() */) {
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_MASTER;
} 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(NS_LITERAL_STRING("priority"), &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();
ParticularProcessPriorityManager::StaticInit();
}
/* static */
void ProcessPriorityManager::SetProcessPriority(ContentParent* aContentParent,
ProcessPriority aPriority) {
MOZ_ASSERT(aContentParent);
ProcessPriorityManagerImpl* singleton =
ProcessPriorityManagerImpl::GetSingleton();
if (singleton) {
singleton->SetProcessPriority(aContentParent, aPriority);
}
}
/* static */
bool ProcessPriorityManager::CurrentProcessIsForeground() {
return ProcessPriorityManagerChild::Singleton()->CurrentProcessIsForeground();
}
/* static */
void ProcessPriorityManager::TabActivityChanged(TabParent* aTabParent,
bool aIsActive) {
MOZ_ASSERT(aTabParent);
ProcessPriorityManagerImpl* singleton =
ProcessPriorityManagerImpl::GetSingleton();
if (!singleton) {
return;
}
singleton->TabActivityChanged(aTabParent, aIsActive);
}
} // namespace mozilla
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