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132 lines
4.6 KiB
C++
132 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_IdleSchedulerParent_h__
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#define mozilla_ipc_IdleSchedulerParent_h__
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#include "mozilla/Assertions.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/LinkedList.h"
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#include "mozilla/ipc/PIdleSchedulerParent.h"
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#include "base/shared_memory.h"
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#include <bitset>
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#define NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT 1024
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#define NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER 0
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#define NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER 1
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class nsITimer;
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namespace mozilla {
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namespace ipc {
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class BackgroundParentImpl;
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class IdleSchedulerParent final
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: public PIdleSchedulerParent,
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public LinkedListElement<IdleSchedulerParent> {
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public:
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NS_INLINE_DECL_REFCOUNTING(IdleSchedulerParent)
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IPCResult RecvInitForIdleUse(InitForIdleUseResolver&& aResolve);
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IPCResult RecvRequestIdleTime(uint64_t aId, TimeDuration aBudget);
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IPCResult RecvIdleTimeUsed(uint64_t aId);
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IPCResult RecvSchedule();
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IPCResult RecvRunningPrioritizedOperation();
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IPCResult RecvPrioritizedOperationDone();
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IPCResult RecvRequestGC(RequestGCResolver&& aResolve);
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IPCResult RecvStartedGC();
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IPCResult RecvDoneGC();
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private:
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friend class BackgroundParentImpl;
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IdleSchedulerParent();
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~IdleSchedulerParent();
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static void CalculateNumIdleTasks();
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static int32_t ActiveCount();
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static void Schedule(IdleSchedulerParent* aRequester);
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static bool HasSpareCycles(int32_t aActiveCount);
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static bool HasSpareGCCycles();
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using PIdleSchedulerParent::SendIdleTime;
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void SendIdleTime();
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void SendMayGC();
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static void EnsureStarvationTimer();
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static void StarvationCallback(nsITimer* aTimer, void* aData);
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uint64_t mCurrentRequestId = 0;
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// For now we don't really use idle budget for scheduling. Zero if the
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// process isn't requestiong or running an idle task.
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TimeDuration mRequestedIdleBudget;
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// Counting all the prioritized operations the process is doing.
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uint32_t mRunningPrioritizedOperation = 0;
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// Only one of these may be true at a time, giving three states:
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// No active GC request, A pending GC request, or a granted GC request.
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Maybe<RequestGCResolver> mRequestingGC;
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bool mDoingGC = false;
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uint32_t mChildId = 0;
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// Current state, only one of these may be true at a time.
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bool IsWaitingForIdle() const { return isInList() && mRequestedIdleBudget; }
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bool IsDoingIdleTask() const { return !isInList() && mRequestedIdleBudget; }
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bool IsNotDoingIdleTask() const { return !mRequestedIdleBudget; }
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// Shared memory for counting how many child processes are running
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// tasks. This memory is shared across all the child processes.
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// The [0] is used for counting all the processes and
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// [childId] is for counting per process activity.
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// This way the global activity can be checked in a fast way by just looking
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// at [0] value.
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// [1] is used for cpu count for child processes.
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static base::SharedMemory* sActiveChildCounter;
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// A bit is set if there is a child with child Id as the offset.
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// The bit is used to check per child specific activity counters in
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// sActiveChildCounter.
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static std::bitset<NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT>
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sInUseChildCounters;
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// Processes on this list have requested (but the request hasn't yet been
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// granted) idle time or to start a GC or both.
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//
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// Either or both their mRequestedIdleBudget or mRequestingGC fields are
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// non-zero. Child processes not on this list have either been granted all
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// their requests not made a request ever or since they last finished an idle
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// or GC task.
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//
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// Use the methods above to determine a process' idle time state, or check the
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// mRequestingGC and mDoingGC fields for the GC state.
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static LinkedList<IdleSchedulerParent> sIdleAndGCRequests;
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static int32_t sMaxConcurrentIdleTasksInChildProcesses;
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static uint32_t sMaxConcurrentGCs;
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static uint32_t sActiveGCs;
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// Counting all the child processes which have at least one prioritized
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// operation.
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static uint32_t sChildProcessesRunningPrioritizedOperation;
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// When this hits zero, it's time to free the shared memory and pack up.
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static uint32_t sChildProcessesAlive;
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static nsITimer* sStarvationPreventer;
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static uint32_t sNumCPUs;
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static uint32_t sPrefConcurrentGCsMax;
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static uint32_t sPrefConcurrentGCsCPUDivisor;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // mozilla_ipc_IdleSchedulerParent_h__
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