webengine/osswebengine/MemoryManager/Src/StopScheduler.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 15 Jul 2010 19:53:20 +0300
branchRCL_3
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parent 0 dd21522fd290
child 93 79859ed3eea9
permissions -rw-r--r--
Revision: 201026 Kit: 2010127
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/*
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  
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*
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*
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*/
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#include "StopScheduler.h"
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#include "MemoryPool.h"
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#include "fast_malloc.h"
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#include "MemoryLogger.h"
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#include <hal.h>
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// MEMBER FUNCTIONS
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static const TTimeIntervalMicroSeconds32 KMemoryCheckIntervalSlow = 1000000;        // 1 second
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static const TTimeIntervalMicroSeconds32 KMemoryCheckIntervalFast = 500000;         // 0.5 second
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//-----------------------------------------------------------------------------
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// CStopScheduler::CStopScheduler
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//-----------------------------------------------------------------------------
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CStopScheduler::CStopScheduler(CMemoryPool& aMemoryPool)
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  : CActive( CActive::EPriorityHigh ), iMemoryPool( aMemoryPool ), iState( EIdle ), iNextStop( EAllStop )
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    {
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    CActiveScheduler::Add( this );
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    iCheckTimer.CreateLocal();
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::~CStopScheduler
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//-----------------------------------------------------------------------------
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CStopScheduler::~CStopScheduler()
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    {
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    iCheckTimer.Close();
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    Cancel();
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::Start
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//-----------------------------------------------------------------------------
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void CStopScheduler::Start( TSchedulerState aState, TInt aMemSize )
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    {
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    // stopping has a higher priority than collecting
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    if( aState <= iState ) return;
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    Cancel();
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    iMemRequested = aMemSize;
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    iState = aState;
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    SelfComplete();
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    iNextStop = EAllStop;
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    }
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void CStopScheduler::SelfComplete()
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    {
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    TRequestStatus* status = &iStatus;
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    SetActive();
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    User::RequestComplete( status, iState );    
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::RunL
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//-----------------------------------------------------------------------------
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void CStopScheduler::RunL()
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    {
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    if( iState == EStopLoading )
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        {
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        StopLoading( EOOM_PriorityLow );
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        iNextStop &= ~ENormalStop;
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        CheckMemoryDefered( KMemoryCheckIntervalFast );
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        }
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    else if( iState == ECheckMemory )
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        {
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        TInt systemFreeRAM; 
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        if(HAL::Get(HALData::EMemoryRAMFree, systemFreeRAM) != KErrNone) 
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            return;        
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        // case 1: Good memory levels - no worry
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        if( systemFreeRAM > KGoodMemoryThreshold ) // Above 4MB
0
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            {
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            iMemoryPool.RestoreCollectors( EOOM_PriorityLow ); // restore all collectors
0
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            iState = EIdle;
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            iNextStop = EAllStop;
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            // recover the rescue buffer, if it is already released.
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            iMemoryPool.RestoreRescueBuffer();
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            return;
0
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            }
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        // case 2: Going low - keep checking
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        if( systemFreeRAM > KLowMemoryThreshold ) // Between 4MB to 2MB
0
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            {
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            CheckMemoryDefered( KMemoryCheckIntervalSlow );
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            iNextStop = EAllStop;
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            return;
0
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            }
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        // case 3: Below normal levels - stop low priority activites
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        if( systemFreeRAM > KStopThreshold )  // Between 2MB to 1MB
0
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            {
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            if( iNextStop & ENormalStop ) 
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                {
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                StopLoading( EOOM_PriorityLow );
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                iNextStop &= ~ENormalStop;
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                }
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            CheckMemoryDefered( KMemoryCheckIntervalFast );
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            }        
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        else // case 4: Really low - stop in emergency (all activites), below 1MB
0
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            {
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            if( iNextStop & EEmergencyStop ) 
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                {
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                StopLoading( EOOM_PriorityHigh );
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                iNextStop &= ~EEmergencyStop;
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                }
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            CheckMemoryDefered( KMemoryCheckIntervalSlow ); // need to restore colectors later
0
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            }
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        }
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::DoCancel
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//-----------------------------------------------------------------------------
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void CStopScheduler::DoCancel()
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    {
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    iState = EIdle;
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::StopLoading
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//-----------------------------------------------------------------------------
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void CStopScheduler::StopLoading( TOOMPriority aPriority )
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    {
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    MEM_LOG("CStopScheduler::StopLoading - run");
0
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    // stop operations
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    for( TInt i=0; i<iMemoryPool.Stoppers().Count(); ++i )
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        {
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        MOOMStopper* stopper = iMemoryPool.Stoppers()[i];
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        if( stopper->Priority() == aPriority )
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            stopper->Stop();
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        }
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    iMemoryPool.CollectMemory(2*KGoodMemoryThreshold);  // try to collect memory
0
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    iMemoryPool.SetStopping( EFalse );
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    }
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//-----------------------------------------------------------------------------
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// CStopScheduler::CheckMemoryDefered
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//-----------------------------------------------------------------------------
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void CStopScheduler::CheckMemoryDefered( TTimeIntervalMicroSeconds32 aDelay )
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    {
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    iState = ECheckMemory;
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    if( !IsActive() )
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        {
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        iCheckTimer.After( iStatus, aDelay );
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        SetActive();
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        }
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    }
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// END OF FILE