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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /ipc/glue/IdleSchedulerParent.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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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/. */
+
+#ifndef mozilla_ipc_IdleSchedulerParent_h__
+#define mozilla_ipc_IdleSchedulerParent_h__
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/ipc/PIdleSchedulerParent.h"
+#include "base/shared_memory.h"
+#include <bitset>
+
+#define NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT 1024
+#define NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER 0
+#define NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER 1
+
+class nsITimer;
+
+namespace mozilla {
+
+namespace ipc {
+
+class BackgroundParentImpl;
+
+class IdleSchedulerParent final
+ : public PIdleSchedulerParent,
+ public LinkedListElement<IdleSchedulerParent> {
+ public:
+ NS_INLINE_DECL_REFCOUNTING(IdleSchedulerParent)
+
+ IPCResult RecvInitForIdleUse(InitForIdleUseResolver&& aResolve);
+ IPCResult RecvRequestIdleTime(uint64_t aId, TimeDuration aBudget);
+ IPCResult RecvIdleTimeUsed(uint64_t aId);
+ IPCResult RecvSchedule();
+ IPCResult RecvRunningPrioritizedOperation();
+ IPCResult RecvPrioritizedOperationDone();
+ IPCResult RecvRequestGC(RequestGCResolver&& aResolve);
+ IPCResult RecvStartedGC();
+ IPCResult RecvDoneGC();
+
+ private:
+ friend class BackgroundParentImpl;
+ IdleSchedulerParent();
+ ~IdleSchedulerParent();
+
+ static void CalculateNumIdleTasks();
+
+ static int32_t ActiveCount();
+ static void Schedule(IdleSchedulerParent* aRequester);
+ static bool HasSpareCycles(int32_t aActiveCount);
+ static bool HasSpareGCCycles();
+ using PIdleSchedulerParent::SendIdleTime;
+ void SendIdleTime();
+ void SendMayGC();
+
+ static void EnsureStarvationTimer();
+ static void StarvationCallback(nsITimer* aTimer, void* aData);
+
+ uint64_t mCurrentRequestId = 0;
+ // For now we don't really use idle budget for scheduling. Zero if the
+ // process isn't requestiong or running an idle task.
+ TimeDuration mRequestedIdleBudget;
+
+ // Counting all the prioritized operations the process is doing.
+ uint32_t mRunningPrioritizedOperation = 0;
+
+ // Only one of these may be true at a time, giving three states:
+ // No active GC request, A pending GC request, or a granted GC request.
+ Maybe<RequestGCResolver> mRequestingGC;
+ bool mDoingGC = false;
+
+ uint32_t mChildId = 0;
+
+ // Current state, only one of these may be true at a time.
+ bool IsWaitingForIdle() const { return isInList() && mRequestedIdleBudget; }
+ bool IsDoingIdleTask() const { return !isInList() && mRequestedIdleBudget; }
+ bool IsNotDoingIdleTask() const { return !mRequestedIdleBudget; }
+
+ // Shared memory for counting how many child processes are running
+ // tasks. This memory is shared across all the child processes.
+ // The [0] is used for counting all the processes and
+ // [childId] is for counting per process activity.
+ // This way the global activity can be checked in a fast way by just looking
+ // at [0] value.
+ // [1] is used for cpu count for child processes.
+ static base::SharedMemory* sActiveChildCounter;
+ // A bit is set if there is a child with child Id as the offset.
+ // The bit is used to check per child specific activity counters in
+ // sActiveChildCounter.
+ static std::bitset<NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT>
+ sInUseChildCounters;
+
+ // Processes on this list have requested (but the request hasn't yet been
+ // granted) idle time or to start a GC or both.
+ //
+ // Either or both their mRequestedIdleBudget or mRequestingGC fields are
+ // non-zero. Child processes not on this list have either been granted all
+ // their requests not made a request ever or since they last finished an idle
+ // or GC task.
+ //
+ // Use the methods above to determine a process' idle time state, or check the
+ // mRequestingGC and mDoingGC fields for the GC state.
+ static LinkedList<IdleSchedulerParent> sIdleAndGCRequests;
+
+ static int32_t sMaxConcurrentIdleTasksInChildProcesses;
+ static uint32_t sMaxConcurrentGCs;
+ static uint32_t sActiveGCs;
+
+ // True if we should record some telemetry for GCs in the next Schedule().
+ // This is set to true by either requesting a GC job or scheduling a GC job.
+ static bool sRecordGCTelemetry;
+ // The current number of waiting GCs.
+ static uint32_t sNumWaitingGC;
+
+ // Counting all the child processes which have at least one prioritized
+ // operation.
+ static uint32_t sChildProcessesRunningPrioritizedOperation;
+
+ // When this hits zero, it's time to free the shared memory and pack up.
+ static uint32_t sChildProcessesAlive;
+
+ static nsITimer* sStarvationPreventer;
+
+ static uint32_t sNumCPUs;
+ static uint32_t sPrefConcurrentGCsMax;
+ static uint32_t sPrefConcurrentGCsCPUDivisor;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif // mozilla_ipc_IdleSchedulerParent_h__