add preemption event

Author: kruall

ydb/library/actors/core/events.h

@@ -106,6 +106,7 @@ namespace NActors {
                 CoroTimeout,
                 InvokeQuery,
                 Wilson,
+                Preemption,
                 End,
 
                 // Compatibility section
@@ -128,6 +129,14 @@ namespace NActors {
             const ui64 Tag = 0;
         };
 
+        struct TEvPreemption: public TEventLocal<TEvPreemption, TSystem::Preemption> {
+            bool ByEventCount = false;
+            bool ByCycles = false;
+            bool ByTailSend = false;
+            ui32 EventCount = 0;
+            ui64 Cycles = 0;
+        };
+
         struct TEvSubscribe: public TEventLocal<TEvSubscribe, TSystem::Subscribe> {
         };
 

ydb/library/actors/core/executor_thread.cpp

@@ -181,6 +181,26 @@ namespace NActors {
                 SafeTypeName(actorType));
     }
 
+    ui32 TGenericExecutorThread::GetOverwrittenEventsPerMailbox() const {
+        return Ctx.OverwrittenEventsPerMailbox;
+    }
+
+    void TGenericExecutorThread::SetOverwrittenEventsPerMailbox(ui32 value) {
+        Ctx.OverwrittenEventsPerMailbox = Max(value, Ctx.EventsPerMailbox);
+    }
+
+    ui64 TGenericExecutorThread::GetOverwrittenTimePerMailboxTs() const {
+        return Ctx.OverwrittenTimePerMailboxTs;
+    }
+
+    void TGenericExecutorThread::SetOverwrittenTimePerMailboxTs(ui64 value) {
+        Ctx.OverwrittenTimePerMailboxTs = Max(value, Ctx.TimePerMailboxTs);
+    }
+
+    void TGenericExecutorThread::SubscribeToPreemption(TActorId actorId) {
+        Ctx.PreemptionSubscribed.push_back(actorId);
+    }
+
     TGenericExecutorThread::TProcessingResult TGenericExecutorThread::Execute(TMailbox* mailbox, bool isTailExecution) {
         Y_DEBUG_ABORT_UNLESS(DyingActors.empty());
 
@@ -194,16 +214,20 @@ namespace NActors {
         ui32 prevActivityType = std::numeric_limits<ui32>::max();
         TActorId recipient;
         bool firstEvent = true;
-        bool preempted = false;
+        bool preemptedByEventCount = false;
+        bool preemptedByCycles = false;
+        bool preemptedByTailSend = false;
         bool wasWorking = false;
         NHPTimer::STime hpnow = Ctx.HPStart;
         NHPTimer::STime hpprev = TlsThreadContext->UpdateStartOfProcessingEventTS(hpnow);
         Ctx.AddElapsedCycles(ActorSystemIndex, hpnow - hpprev);
         NHPTimer::STime eventStart = Ctx.HPStart;
         TlsThreadContext->ActivationStartTS.store(Ctx.HPStart, std::memory_order_release);
 
+        Ctx.OverwrittenEventsPerMailbox = Ctx.EventsPerMailbox;
+        Ctx.OverwrittenTimePerMailboxTs = Ctx.TimePerMailboxTs;
         bool drained = false;
-        for (; Ctx.ExecutedEvents < Ctx.EventsPerMailbox; ++Ctx.ExecutedEvents) {
+        for (; Ctx.ExecutedEvents < Ctx.OverwrittenEventsPerMailbox; ++Ctx.ExecutedEvents) {
             if (TAutoPtr<IEventHandle> evExt = mailbox->Pop()) {
                 recipient = evExt->GetRecipientRewrite();
                 TActorContext ctx(*mailbox, *this, eventStart, recipient);
@@ -302,6 +326,7 @@ namespace NActors {
                             Ctx.WorkerId,
                             recipient.ToString(),
                             SafeTypeName(actorType));
+                    preemptedByTailSend = true;
                     break;
                 }
 
@@ -317,7 +342,7 @@ namespace NActors {
                             Ctx.WorkerId,
                             recipient.ToString(),
                             SafeTypeName(actorType));
-                    preempted = true;
+                    preemptedByCycles = true;
                     break;
                 }
 
@@ -333,7 +358,7 @@ namespace NActors {
                             Ctx.WorkerId,
                             recipient.ToString(),
                             SafeTypeName(actorType));
-                    preempted = true;
+                    preemptedByCycles = true;
                     break;
                 }
 
@@ -348,7 +373,7 @@ namespace NActors {
                             Ctx.WorkerId,
                             recipient.ToString(),
                             SafeTypeName(actorType));
-                    preempted = true;
+                    preemptedByEventCount = true;
                     break;
                 }
             } else {
@@ -367,6 +392,22 @@ namespace NActors {
                 break; // empty queue, leave
             }
         }
+        if (Ctx.PreemptionSubscribed.size()) {
+            std::unique_ptr<TEvents::TEvPreemption> event = std::make_unique<TEvents::TEvPreemption>();
+            event->ByEventCount = preemptedByEventCount;
+            event->ByCycles = preemptedByCycles;
+            event->ByTailSend = preemptedByTailSend;
+            event->EventCount = Ctx.ExecutedEvents;
+            event->Cycles = hpnow - Ctx.HPStart;
+            TAutoPtr<IEventHandle> ev = new IEventHandle(TActorId(), TActorId(), event.release());
+            for (const auto& actorId : Ctx.PreemptionSubscribed) {
+                IActor *actor = mailbox->FindActor(actorId.LocalId());
+                if (actor) {
+                    actor->Receive(ev);
+                }
+            }
+            Ctx.PreemptionSubscribed.clear();
+        }
         TlsThreadContext->ActivationStartTS.store(hpnow, std::memory_order_release);
         TlsThreadContext->ElapsingActorActivity.store(ActorSystemIndex, std::memory_order_release);
 
@@ -378,7 +419,7 @@ namespace NActors {
         } else {
             mailbox->Unlock(Ctx.Executor, hpnow, RevolvingWriteCounter);
         }
-        return {preempted, wasWorking};
+        return {preemptedByEventCount || preemptedByCycles, wasWorking};
     }
 
     TThreadId TGenericExecutorThread::GetThreadId() const {

ydb/library/actors/core/executor_thread.h

@@ -75,6 +75,12 @@ namespace NActors {
         TThreadId GetThreadId() const; // blocks, must be called after Start()
         TWorkerId GetWorkerId() const;
 
+        void SubscribeToPreemption(TActorId actorId);
+        ui32 GetOverwrittenEventsPerMailbox() const;
+        void SetOverwrittenEventsPerMailbox(ui32 value);
+        ui64 GetOverwrittenTimePerMailboxTs() const;
+        void SetOverwrittenTimePerMailboxTs(ui64 value);
+
     protected:
         TProcessingResult ProcessExecutorPool(IExecutorPool *pool);
 

ydb/library/actors/core/worker_context.h

@@ -44,8 +44,11 @@ namespace NActors {
         bool IsNeededToWaitNextActivation = true;
         i64 HPStart = 0;
         ui32 ExecutedEvents = 0;
+        ui32 OverwrittenEventsPerMailbox = 0;
+        ui64 OverwrittenTimePerMailboxTs = 0;
         TSharedExecutorThreadCtx *SharedThread = nullptr;
         TCpuSensor CpuSensor;
+        TStackVec<TActorId, 1> PreemptionSubscribed;
 
         TMailboxCache MailboxCache;