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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 */
#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>
class nsITimer;
namespace mozilla {
namespace ipc {
class BackgroundParentImpl;
class IdleSchedulerParent final
: public PIdleSchedulerParent,
public LinkedListElement<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();
friend class BackgroundParentImpl;
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.
// 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__