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-rw-r--r--ipc/glue/IdleSchedulerChild.cpp152
1 files changed, 152 insertions, 0 deletions
diff --git a/ipc/glue/IdleSchedulerChild.cpp b/ipc/glue/IdleSchedulerChild.cpp
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+++ b/ipc/glue/IdleSchedulerChild.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 "mozilla/ipc/IdleSchedulerChild.h"
+#include "mozilla/ipc/IdleSchedulerParent.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/IdlePeriodState.h"
+#include "mozilla/Telemetry.h"
+#include "BackgroundChild.h"
+
+namespace mozilla::ipc {
+
+static IdleSchedulerChild* sMainThreadIdleScheduler = nullptr;
+static bool sIdleSchedulerDestroyed = false;
+
+IdleSchedulerChild::~IdleSchedulerChild() {
+ if (sMainThreadIdleScheduler == this) {
+ sMainThreadIdleScheduler = nullptr;
+ sIdleSchedulerDestroyed = true;
+ }
+ MOZ_ASSERT(!mIdlePeriodState);
+}
+
+void IdleSchedulerChild::Init(IdlePeriodState* aIdlePeriodState) {
+ mIdlePeriodState = aIdlePeriodState;
+
+ RefPtr<IdleSchedulerChild> scheduler = this;
+ auto resolve =
+ [&](std::tuple<mozilla::Maybe<SharedMemoryHandle>, uint32_t>&& aResult) {
+ if (std::get<0>(aResult)) {
+ mActiveCounter.SetHandle(std::move(*std::get<0>(aResult)), false);
+ mActiveCounter.Map(sizeof(int32_t));
+ mChildId = std::get<1>(aResult);
+ if (mChildId && mIdlePeriodState && mIdlePeriodState->IsActive()) {
+ SetActive();
+ }
+ }
+ };
+
+ auto reject = [&](ResponseRejectReason) {};
+ SendInitForIdleUse(std::move(resolve), std::move(reject));
+}
+
+IPCResult IdleSchedulerChild::RecvIdleTime(uint64_t aId, TimeDuration aBudget) {
+ if (mIdlePeriodState) {
+ mIdlePeriodState->SetIdleToken(aId, aBudget);
+ }
+ return IPC_OK();
+}
+
+void IdleSchedulerChild::SetActive() {
+ if (mChildId && CanSend() && mActiveCounter.memory()) {
+ ++(static_cast<Atomic<int32_t>*>(
+ mActiveCounter.memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER]);
+ ++(static_cast<Atomic<int32_t>*>(mActiveCounter.memory())[mChildId]);
+ }
+}
+
+bool IdleSchedulerChild::SetPaused() {
+ if (mChildId && CanSend() && mActiveCounter.memory()) {
+ --(static_cast<Atomic<int32_t>*>(mActiveCounter.memory())[mChildId]);
+ // The following expression reduces the global activity count and checks if
+ // it drops below the cpu counter limit.
+ return (static_cast<Atomic<int32_t>*>(
+ mActiveCounter
+ .memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER])-- ==
+ static_cast<Atomic<int32_t>*>(
+ mActiveCounter.memory())[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER];
+ }
+
+ return false;
+}
+
+RefPtr<IdleSchedulerChild::MayGCPromise> IdleSchedulerChild::MayGCNow() {
+ if (mIsRequestingGC || mIsDoingGC) {
+ return MayGCPromise::CreateAndResolve(false, __func__);
+ }
+ TimeStamp wait_since = TimeStamp::Now();
+
+ mIsRequestingGC = true;
+ return SendRequestGC()->Then(
+ GetMainThreadSerialEventTarget(), __func__,
+ [self = RefPtr(this), wait_since](bool aIgnored) {
+ // Only one of these may be true at a time.
+ MOZ_ASSERT(!(self->mIsRequestingGC && self->mIsDoingGC));
+
+ // The parent process always says yes, sometimes after a delay.
+ if (self->mIsRequestingGC) {
+ Telemetry::AccumulateTimeDelta(Telemetry::GC_WAIT_FOR_IDLE_MS,
+ wait_since);
+ self->mIsRequestingGC = false;
+ self->mIsDoingGC = true;
+ return MayGCPromise::CreateAndResolve(true, __func__);
+ }
+ return MayGCPromise::CreateAndResolve(false, __func__);
+ },
+ [self = RefPtr(this)](ResponseRejectReason reason) {
+ self->mIsRequestingGC = false;
+ return MayGCPromise::CreateAndReject(reason, __func__);
+ });
+}
+
+void IdleSchedulerChild::StartedGC() {
+ // Only one of these may be true at a time.
+ MOZ_ASSERT(!(mIsRequestingGC && mIsDoingGC));
+
+ // If mRequestingGC was true then when the outstanding GC request returns
+ // it'll see that the GC has already started.
+ mIsRequestingGC = false;
+
+ if (!mIsDoingGC) {
+ if (CanSend()) {
+ SendStartedGC();
+ }
+ mIsDoingGC = true;
+ }
+}
+
+void IdleSchedulerChild::DoneGC() {
+ if (mIsDoingGC) {
+ if (CanSend()) {
+ SendDoneGC();
+ }
+ mIsDoingGC = false;
+ }
+}
+
+IdleSchedulerChild* IdleSchedulerChild::GetMainThreadIdleScheduler() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (sMainThreadIdleScheduler) {
+ return sMainThreadIdleScheduler;
+ }
+
+ if (sIdleSchedulerDestroyed) {
+ return nullptr;
+ }
+
+ ipc::PBackgroundChild* background =
+ ipc::BackgroundChild::GetOrCreateForCurrentThread();
+ if (background) {
+ sMainThreadIdleScheduler = new ipc::IdleSchedulerChild();
+ background->SendPIdleSchedulerConstructor(sMainThreadIdleScheduler);
+ }
+ return sMainThreadIdleScheduler;
+}
+
+} // namespace mozilla::ipc