author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 44 | 36bfc973b146 |
parent 43 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 2008-2009 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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// Other possible inputs to thrashing detection: |
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// - cache size and free ram |
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// - pin failures |
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// |
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#include <kernel/kern_priv.h> |
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#include "mthrash.h" |
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const TInt KUpdatePeriod = 1000; // Update every second |
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DThrashMonitor TheThrashMonitor; |
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DThrashMonitor::DThrashMonitor() : |
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iRunning(EFalse), |
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iUpdateTimer(NULL, this), |
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iUpdateDfc(UpdateDfcFunc, this, 0), |
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iThrashLevel(0), |
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iThresholdThrashing(200), |
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iThresholdGood(150) |
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{ |
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} |
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void DThrashMonitor::Start() |
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{ |
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TBool alreadyRunning = __e32_atomic_swp_ord32(&iRunning, ETrue); |
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if (alreadyRunning) |
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return; |
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// reset |
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memclr(&iCount[0], sizeof(iCount)); |
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iLastUpdateTime = NKern::TickCount(); |
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iUpdateDfc.SetDfcQ(Kern::DfcQue0()); |
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TInt r = iUpdateTimer.OneShot(KUpdatePeriod, iUpdateDfc); |
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__NK_ASSERT_ALWAYS(r == KErrNone); |
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} |
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TInt DThrashMonitor::ThrashLevel() |
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{ |
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return iThrashLevel; |
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} |
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TInt DThrashMonitor::SetThresholds(TUint aThrashing, TUint aGood) |
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{ |
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if (aThrashing < aGood || aThrashing > 255) |
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return KErrArgument; |
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iThresholdThrashing = aThrashing; |
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iThresholdGood = aGood; |
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return KErrNone; |
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} |
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void DThrashMonitor::UpdateCount(TCount aCount, TInt aDelta) |
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{ |
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TCountData& c = iCount[aCount]; |
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NKern::FMWait(&iMutex); |
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TUint32 currentTime = NKern::TickCount(); |
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c.iTotal += (TInt64)c.iCount * (currentTime - c.iLastUpdateTime); |
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c.iCount += aDelta; |
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c.iLastUpdateTime = currentTime; |
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if(!iUpdateTimer.IsPending()) |
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{ |
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TInt r = iUpdateTimer.OneShot(KUpdatePeriod, iUpdateDfc); |
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__NK_ASSERT_ALWAYS(r == KErrNone); |
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} |
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NKern::FMSignal(&iMutex); |
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__NK_ASSERT_DEBUG(c.iCount >= 0); |
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} |
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void DThrashMonitor::NotifyStartPaging() |
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{ |
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UpdateCount(ECountThreadsPaging, 1); |
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} |
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void DThrashMonitor::NotifyEndPaging() |
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{ |
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UpdateCount(ECountThreadsPaging, -1); |
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} |
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void DThrashMonitor::UpdateDfcFunc(TAny* aPtr) |
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{ |
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DThrashMonitor* self = (DThrashMonitor*)aPtr; |
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self->RecalculateThrashLevel(); |
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} |
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void DThrashMonitor::RecalculateThrashLevel() |
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{ |
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TInt currentTime = NKern::TickCount(); |
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TInt elapsedTicks = currentTime - iLastUpdateTime; |
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NKern::FMWait(&iMutex); |
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for (TInt i = 0 ; i < EMaxCount ; ++i) |
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{ |
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TCountData& c = iCount[i]; |
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c.iTotal += (TInt64)c.iCount * (currentTime - c.iLastUpdateTime); |
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c.iAverage = (TInt)((256 * c.iTotal) / elapsedTicks); |
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c.iTotal = 0; |
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c.iLastUpdateTime = currentTime; |
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} |
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NKern::FMSignal(&iMutex); |
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TInt pagingActivity = Min(iCount[ECountThreadsPaging].iAverage, 255); |
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// Base thrash level entirely on the average number of threads paging |
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TInt newThrashLevel = pagingActivity; |
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TInt oldThrashLevel = iThrashLevel; |
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// Make thrash level increase slowly over time, but decrease quickly |
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if (newThrashLevel > oldThrashLevel) |
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newThrashLevel = (3 * oldThrashLevel + pagingActivity) >> 2; |
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iThrashLevel = newThrashLevel; |
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// Notify user-side if thrashing thresholds passed |
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TBool notifyChange = EFalse; |
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if (oldThrashLevel < iThresholdThrashing && newThrashLevel >= iThresholdThrashing) |
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{ |
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iIsThrashing = ETrue; |
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notifyChange = ETrue; |
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} |
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else if (iIsThrashing && oldThrashLevel >= iThresholdGood && newThrashLevel < iThresholdGood) |
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{ |
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iIsThrashing = EFalse; |
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notifyChange = ETrue; |
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} |
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if (notifyChange) |
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{ |
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NKern::ThreadEnterCS(); |
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Kern::AsyncNotifyChanges(EChangesThrashLevel); |
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NKern::ThreadLeaveCS(); |
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} |
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iLastUpdateTime = currentTime; |
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if(iThrashLevel != 0) |
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{ |
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NKern::FMWait(&iMutex); |
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if(!iUpdateTimer.IsPending()) |
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{ |
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TInt r = iUpdateTimer.Again(KUpdatePeriod); |
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if (r == KErrArgument) |
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{ |
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r = iUpdateTimer.OneShot(KUpdatePeriod, iUpdateDfc); |
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} |
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__NK_ASSERT_ALWAYS(r == KErrNone); |
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} |
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NKern::FMSignal(&iMutex); |
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} |
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} |