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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();
private:
friend class BackgroundParentImpl;
IdleSchedulerParent();
~IdleSchedulerParent();
static int32_t ActiveCount();
static void Schedule(IdleSchedulerParent* aRequester);
static bool HasSpareCycles(int32_t aActiveCount);
using PIdleSchedulerParent::SendIdleTime;
void SendIdleTime();
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;
uint32_t mChildId = 0;
// Current state, only one of these may be true at a time.
bool IsWaitingForIdle() const {
MOZ_ASSERT_IF(isInList(), mRequestedIdleBudget);
return isInList();
}
bool IsDoingIdleTask() const { return !isInList() && mRequestedIdleBudget; }
bool IsNotDoingIdleTask() const {
return !isInList() && !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 idle time, but haven't got it yet.
// Their mRequestedIdleBudget field is non-zero.
// Child processes not on this list have either been granted their request for
// idle time (mRequestedIdleBudget is non-zero) or have not requested idle
// time ever or since they last finished an idle task or (mRequestedIdleBudget
// is zero),
static LinkedList<IdleSchedulerParent> sWaitingForIdle;
static Atomic<int32_t> sMaxConcurrentIdleTasksInChildProcesses;
// 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;
};
} // namespace ipc
} // namespace mozilla
#endif // mozilla_ipc_IdleSchedulerParent_h__
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