windowing/windowserver/nga/SERVER/WsMemMgr.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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// Copyright (c) 2007-2009 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 "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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#include "WsMemMgr.h"
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#include "inifile.h"
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#include "panics.h"
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#include "wstop.h"
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static const TTimeIntervalMicroSeconds KBurstDuration = 1000000; //one second
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static const TInt KMaxMemoryReleasesPerBurst = 5;
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CWsMemoryManager * CWsMemoryManager::iStatic = NULL;
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CWsMemoryManager * CWsMemoryManager::Static()
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	{
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	return iStatic;
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	}
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CWsMemoryManager * CWsMemoryManager::NewLC()
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	{
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	CWsMemoryManager * self = new (ELeave) CWsMemoryManager;
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	iStatic = self;
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	return iStatic;
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	}
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CWsMemoryManager::CWsMemoryManager()
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	{
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	iImpl = User::SwitchAllocator(this);
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	}
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CWsMemoryManager::~CWsMemoryManager()
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	{
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	WS_ASSERT_ALWAYS(this == User::SwitchAllocator(iImpl),EWsPanicMemoryManager);
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	iStatic = 0;
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	if (iReserve!=NULL)
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		{
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		Free(iReserve);
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		}
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	}
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void CWsMemoryManager::ConstructL()
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	{
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	_LIT(KMemMgrReserve, "MEMORYRESERVE");
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	const TInt KDefaultMemMgrReserve = 1024;
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	if (!WsIniFile->FindVar(KMemMgrReserve, iReserveSize))
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		iReserveSize = KDefaultMemMgrReserve;
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	if (iReserveSize > 0)
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		iReserve = Alloc(iReserveSize);
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	iCurrentBurstStart.UniversalTime();
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	}
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/**
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Tells the memory manager to fail on next retry.
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I.e. whenever the next allocation failure occurs, the memory manager won't try 
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to free up memory to have another go at the allocation.
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N.B. this only applies for the next failure, the state is reset when there is an
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allocation failure.
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This method is only to be used for OOM testing.
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*/
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void CWsMemoryManager::SetFailNextRetry()
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	{
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	iFailNextRetry = ETrue;
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	}
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/**
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Implementing RAllocator
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*/
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/**
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Alloc and ReAlloc attempt to obtain memory through CWsTop::ReleaseMemory when they run low.
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ReleaseMemory looks for blocks of memory that the window server doesn't need urgently and frees
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them.
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*/
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TAny* CWsMemoryManager::Alloc(TInt aSize)
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	{
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	TBool keepTrying = ETrue;
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	do
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		{
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		if(iReleasing)
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			return iImpl->Alloc(aSize); //fallback on RAllocator
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		if(TAny* ret = iImpl->Alloc(aSize)) //normal case
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			return ret;
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		TTime now;
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		now.UniversalTime();
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		if(now.MicroSecondsFrom(iCurrentBurstStart) < KBurstDuration)
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			{
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			iCurrentBurstReleaseCount++;
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			if(iCurrentBurstReleaseCount > KMaxMemoryReleasesPerBurst)
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				return NULL;
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			}
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		else
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			{
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			iCurrentBurstStart = now;
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   114
			iCurrentBurstReleaseCount = 1;
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   115
			}
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parents:
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   116
		
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   117
		if(iReserveEnabled && iReserve && (aSize < iReserveSize))
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   118
			{
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   119
			Free(iReserve);
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   120
			iReserve = NULL;
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   121
			}
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   122
		else
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   123
			{
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   124
			iReleasing = ETrue;
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   125
			keepTrying = CWsTop::ReleaseMemory();
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   126
			if(keepTrying)
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   127
 				{
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   128
 				const TInt reclaimed = Compress(); //Try to give back to the OS
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 				}
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			iReleasing = EFalse;
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   131
			}
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   132
		
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		//used for OOM testing only
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   134
		if(iFailNextRetry)
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   135
			{
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   136
			iFailNextRetry = EFalse;
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   137
			keepTrying = EFalse;
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   138
			}
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   139
		
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   140
		} while(keepTrying);
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   141
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   142
	return NULL;
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   143
	}
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   144
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   145
TAny* CWsMemoryManager::ReAlloc(TAny* aPtr, TInt aSize, TInt aMode)
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   146
	{
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   147
	TBool keepTrying = ETrue;
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   148
	do
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		{
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   150
		if(iReleasing)
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   151
			return iImpl->ReAlloc(aPtr, aSize, aMode); //fallback on RAllocator
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   152
		
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   153
		if(TAny* ret = iImpl->ReAlloc(aPtr, aSize, aMode)) //normal case
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   154
			return ret;
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parents:
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   155
			
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   156
		TTime now;
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   157
		now.UniversalTime();
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   158
		if(now.MicroSecondsFrom(iCurrentBurstStart) < KBurstDuration)
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   159
			{
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   160
			iCurrentBurstReleaseCount++;
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   161
			if(iCurrentBurstReleaseCount > KMaxMemoryReleasesPerBurst)
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   162
				return NULL;
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   163
			}
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   164
		else
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   165
			{
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   166
			iCurrentBurstStart = now;
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   167
			iCurrentBurstReleaseCount = 1;
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   168
			}
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   169
			
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   170
		if(iReserveEnabled && iReserve && (aSize < iReserveSize))
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   171
			{
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   172
			Free(iReserve);
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   173
			iReserve = NULL;
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   174
			}
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   175
		else
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   176
			{
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   177
			iReleasing = ETrue;
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   178
			keepTrying = CWsTop::ReleaseMemory();
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   179
			if(keepTrying)
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   180
 				{
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   181
 				const TInt reclaimed = Compress(); //Try to give back to the OS
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   182
 				}	
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   183
			iReleasing = EFalse;
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   184
			}
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   185
			
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   186
		//used for OOM testing only
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   187
		if(iFailNextRetry)
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parents:
diff changeset
   188
			{
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   189
			iFailNextRetry = EFalse;
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   190
			keepTrying = EFalse;
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diff changeset
   191
			}
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   192
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   193
		} while(keepTrying);
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parents:
diff changeset
   194
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   195
	return NULL;
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   196
	}
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   197
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   198
/**
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   199
The rest of these functions just call the default implementation
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   200
*/
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diff changeset
   201
void CWsMemoryManager::Free(TAny* aPtr)
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   202
	{
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   203
	return iImpl->Free(aPtr);
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   204
	}
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parents:
diff changeset
   205
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   206
TInt CWsMemoryManager::AllocLen(const TAny* aCell) const
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   207
	{
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   208
	return iImpl->AllocLen(aCell);
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diff changeset
   209
	}
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parents:
diff changeset
   210
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   211
TInt CWsMemoryManager::Compress()
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   212
	{
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   213
	return iImpl->Compress();
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   214
	}
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parents:
diff changeset
   215
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parents:
diff changeset
   216
void CWsMemoryManager::Reset()
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   217
	{
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   218
	iImpl->Reset();
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   219
	}
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   220
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   221
TInt CWsMemoryManager::AllocSize(TInt& aTotalAllocSize) const
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   222
	{
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   223
	return iImpl->AllocSize(aTotalAllocSize);
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   224
	}
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parents:
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   225
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   226
TInt CWsMemoryManager::Available(TInt& aBiggestBlock) const
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   227
	{
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   228
	return iImpl->Available(aBiggestBlock);
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   229
	}
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TInt CWsMemoryManager::DebugFunction(TInt aFunc, TAny* a1, TAny* a2)
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	{
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	return iImpl->DebugFunction(aFunc,a1,a2);
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	}
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TInt CWsMemoryManager::Count() const
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	{
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	return iImpl->Count();
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	}
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/** This is a fairly dumb way to enable and disable the reserve, but we normally
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get away with it because wserv is high priority.  A better approach would be to
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use placement new into the reserve memory and manage it directly.  This would also
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allow us to track misbehaving code which allocated during OOM drawing and didn't
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free at the end.
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*/
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void CWsMemoryManager::EnableReserve()
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	{
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	WS_ASSERT_DEBUG(!iReserveEnabled, EWsPanicMemoryManager);
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	iReserveEnabled = ETrue;
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	}
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void CWsMemoryManager::DisableReserve()
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	{
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	WS_ASSERT_DEBUG(iReserveEnabled, EWsPanicMemoryManager);
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	iReserveEnabled = EFalse;
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	if((!iReserve) && (iReserveSize > 0))
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		iReserve = Alloc(iReserveSize);
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	}