author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:24:54 +0200 | |
changeset 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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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 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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#include <plat_priv.h> |
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#include "mm.h" |
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#include "mmu.h" |
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#include "mslaballoc.h" |
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// |
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// RSlabAllocatorBase |
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// |
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RSlabAllocatorBase::RSlabAllocatorBase(TBool aDelayedCleanup) |
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: iFreeCount(0), iReserveCount(0), |
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iSpinLock(TSpinLock::EOrderGenericIrqHigh3), |
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iDelayedCleanup(aDelayedCleanup), iSlabMap(0), iMemory(0), iMapping(0) |
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{ |
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} |
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RSlabAllocatorBase::~RSlabAllocatorBase() |
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{ |
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delete iSlabMap; |
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MM::MappingDestroy(iMapping); |
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MM::MemoryDestroy(iMemory); |
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} |
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TInt RSlabAllocatorBase::Construct(TUint aMaxSlabs, TUint aObjectSize) |
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{ |
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return Construct(aMaxSlabs,aObjectSize,0); |
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} |
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TInt RSlabAllocatorBase::Construct(TUint aMaxSlabs, TUint aObjectSize, TLinAddr aBase) |
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{ |
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TRACE2(("RSlabAllocatorBase::Construct(0x%08x,0x%08x,0x%08x)",aMaxSlabs,aObjectSize,aBase)); |
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// set sizes... |
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iObjectSize = aObjectSize; |
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iObjectsPerSlab = ((KPageSize-sizeof(TSlabHeader))/aObjectSize); |
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// sanity check arguments... |
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__NK_ASSERT_DEBUG(iObjectsPerSlab); |
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__NK_ASSERT_DEBUG(aObjectSize>=sizeof(SDblQueLink)); |
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__NK_ASSERT_DEBUG(aObjectSize%sizeof(TAny*)==0); |
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// construct bitmap for slabs... |
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iSlabMap = TBitMapAllocator::New(aMaxSlabs,ETrue); |
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if(!iSlabMap) |
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return KErrNoMemory; |
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if(aBase) |
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{ |
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// setup base address, we expect one slab to already be mapped at this address... |
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iBase = aBase; |
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// initialise first slab... |
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iSlabMap->Alloc(0,1); |
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InitSlab(iBase); |
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} |
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else |
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{ |
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// construct memory object for slabs... |
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__NK_ASSERT_DEBUG(!iMemory); |
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TInt r = MM::MemoryNew(iMemory,EMemoryObjectUnpaged,aMaxSlabs); |
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if(r!=KErrNone) |
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return r; |
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// construct memory mapping for slabs... |
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r = MM::MappingNew(iMapping,iMemory,ESupervisorReadWrite,KKernelOsAsid); |
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if(r!=KErrNone) |
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return r; |
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// setup base address... |
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iBase = MM::MappingBase(iMapping); |
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} |
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// done... |
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return KErrNone; |
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} |
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TAny* RSlabAllocatorBase::Alloc() |
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{ |
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#ifdef _DEBUG |
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RamAllocLock::Lock(); |
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TBool fail = K::CheckForSimulatedAllocFail(); |
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RamAllocLock::Unlock(); |
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|
105 |
if(fail) |
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|
106 |
return 0; |
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|
107 |
#endif |
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|
108 |
__SPIN_LOCK_IRQ(iSpinLock); |
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|
109 |
|
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|
110 |
// check if we need to allocate a new slab... |
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|
111 |
if(iFreeCount<=iReserveCount && !NewSlab()) |
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|
112 |
{ |
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|
113 |
__SPIN_UNLOCK_IRQ(iSpinLock); |
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|
114 |
return 0; |
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115 |
} |
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|
116 |
|
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117 |
// get a slab with unused objects... |
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|
118 |
TSlabHeader* slab = (TSlabHeader*)iFreeList.iA.iNext; |
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|
119 |
__NK_ASSERT_DEBUG(slab!=(TSlabHeader*)&iFreeList.iA.iNext); |
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|
120 |
#ifdef _DEBUG |
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121 |
CheckSlab(slab); |
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122 |
#endif |
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|
123 |
|
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124 |
// get object from slab... |
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125 |
SDblQueLink* object = (SDblQueLink*)slab->iFreeList.iA.iNext; |
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126 |
TRACE2(("RSlabAllocatorBase::Alloc got 0x%08x",object)); |
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127 |
object->Deque(); |
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128 |
__NK_ASSERT_DEBUG(slab->iAllocCount<iObjectsPerSlab); |
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129 |
++slab->iAllocCount; |
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130 |
--iFreeCount; |
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131 |
|
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132 |
// see if there are uninitialised free objects after the one just allocated... |
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133 |
if(slab->iHighWaterMark==object) |
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|
134 |
{ |
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135 |
SDblQueLink* nextFree = (SDblQueLink*)((TLinAddr)object+iObjectSize); |
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|
136 |
if((TAny*)((TLinAddr)nextFree+iObjectSize)<=slab) |
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|
137 |
{ |
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138 |
slab->iHighWaterMark = nextFree; |
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139 |
slab->iFreeList.Add(nextFree); |
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|
140 |
} |
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|
141 |
} |
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|
142 |
|
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|
143 |
// if slab has no more free objects, remove it from the free list... |
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144 |
if(slab->iFreeList.iA.iNext==&slab->iFreeList.iA) |
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|
145 |
slab->Deque(); |
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|
146 |
|
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|
147 |
__SPIN_UNLOCK_IRQ(iSpinLock); |
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|
148 |
|
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149 |
return object; |
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|
150 |
} |
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|
151 |
|
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|
152 |
|
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153 |
void RSlabAllocatorBase::Free(TAny* aObject) |
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154 |
{ |
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155 |
TRACE2(("RSlabAllocatorBase::Free(0x%08x)",aObject)); |
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|
156 |
|
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157 |
if(!aObject) |
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|
158 |
{ |
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159 |
// nothing to do |
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|
160 |
return; |
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|
161 |
} |
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|
162 |
|
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|
163 |
__SPIN_LOCK_IRQ(iSpinLock); |
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|
164 |
|
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|
165 |
// check object address is valid... |
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|
166 |
__NK_ASSERT_DEBUG((TLinAddr)aObject-iBase < iSlabMap->iSize*(TLinAddr)KPageSize); // in range |
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|
167 |
__NK_ASSERT_DEBUG(((TLinAddr)aObject&KPageMask)%iObjectSize==0); // aligned correctly |
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|
168 |
__NK_ASSERT_DEBUG(((TLinAddr)aObject&KPageMask)<iObjectSize*iObjectsPerSlab); // in slab |
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|
169 |
|
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|
170 |
// get slab for object... |
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|
171 |
TSlabHeader* slab = (TSlabHeader*)(((TLinAddr)aObject|KPageMask)+1)-1; |
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|
172 |
#ifdef _DEBUG |
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|
173 |
CheckSlab(slab); |
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|
174 |
#endif |
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|
175 |
|
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|
176 |
// if slab didn't previously have any free objects, add it to the free list... |
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|
177 |
if(slab->iFreeList.iA.iNext==&slab->iFreeList.iA) |
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|
178 |
iFreeList.AddHead(slab); |
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|
179 |
|
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180 |
// add object to slab's free list... |
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|
181 |
slab->iFreeList.AddHead((SDblQueLink*)(TAny*)aObject); |
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|
182 |
TUint allocCount = --slab->iAllocCount; |
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|
183 |
__NK_ASSERT_DEBUG(allocCount<iObjectsPerSlab); |
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|
184 |
++iFreeCount; |
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|
185 |
|
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|
186 |
if(!allocCount) |
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|
187 |
{ |
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188 |
// if slab is empty, put it on end of free list... |
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|
189 |
slab->Deque(); |
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|
190 |
iFreeList.Add(slab); |
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|
191 |
} |
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192 |
else |
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|
193 |
{ |
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|
194 |
// migrate slab to try and keep fuller slabs near the free list start... |
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|
195 |
TSlabHeader* nextSlab = (TSlabHeader*)slab->iNext; |
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|
196 |
if(nextSlab!=(SDblQueLink*)&iFreeList && allocCount<=nextSlab->iAllocCount) |
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|
197 |
{ |
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|
198 |
slab->Deque(); |
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|
199 |
slab->InsertAfter(nextSlab); |
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|
200 |
} |
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|
201 |
} |
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|
202 |
|
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|
203 |
#ifdef _DEBUG |
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|
204 |
CheckSlab(slab); |
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|
205 |
#endif |
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|
206 |
|
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|
207 |
// check for spare empty slab... |
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TSlabHeader* lastSlab = (TSlabHeader*)iFreeList.iA.iPrev; |
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if(lastSlab->iNext!=lastSlab->iPrev && lastSlab->iAllocCount==0) // not only slab and it's empty... |
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210 |
{ |
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// free up slab... |
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if(!iDelayedCleanup) |
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213 |
{ |
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// free up slab now, (this also relinquishes iSpinLock)... |
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FreeSlab(lastSlab); |
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216 |
} |
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217 |
else |
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218 |
{ |
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219 |
// queue later cleanup... |
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__SPIN_UNLOCK_IRQ(iSpinLock); |
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|
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iCleanup.Add(CleanupTrampoline,this); |
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222 |
} |
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|
223 |
} |
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224 |
else |
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225 |
{ |
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__SPIN_UNLOCK_IRQ(iSpinLock); |
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227 |
} |
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228 |
} |
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229 |
|
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230 |
|
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231 |
#ifdef _DEBUG |
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232 |
|
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void RSlabAllocatorBase::CheckSlab(TSlabHeader* aSlab) |
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234 |
{ |
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// Kern::Printf("CheckSlab %x %x %d",aSlab,aSlab->iHighWaterMark,aSlab->iAllocCount); |
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TAny* base = (TAny*)((TLinAddr)aSlab&~KPageMask); |
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SDblQueLink* o = aSlab->iFreeList.First(); |
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TUint max = ((TLinAddr)aSlab->iHighWaterMark-(TLinAddr)base)/iObjectSize+1; |
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239 |
__NK_ASSERT_DEBUG(aSlab->iAllocCount<=max); |
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240 |
__NK_ASSERT_DEBUG(max<=iObjectsPerSlab); |
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241 |
TUint freeCount = max-aSlab->iAllocCount; |
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242 |
while(freeCount) |
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|
243 |
{ |
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244 |
// Kern::Printf("CheckSlab o=%x",o); |
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245 |
__NK_ASSERT_DEBUG(o>=base); |
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|
246 |
__NK_ASSERT_DEBUG(o<=aSlab->iHighWaterMark); |
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247 |
__NK_ASSERT_DEBUG((((TLinAddr)o-(TLinAddr)base)%iObjectSize)==0); |
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248 |
o = o->iNext; |
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249 |
--freeCount; |
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250 |
} |
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|
251 |
__NK_ASSERT_DEBUG(o==&aSlab->iFreeList.iA); |
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|
252 |
} |
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|
253 |
|
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254 |
#endif |
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|
255 |
|
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|
256 |
|
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|
257 |
TBool RSlabAllocatorBase::NewSlab() |
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|
258 |
{ |
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259 |
TRACE2(("RSlabAllocatorBase::NewSlab()")); |
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|
260 |
|
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|
261 |
for(;;) |
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|
262 |
{ |
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|
263 |
__SPIN_UNLOCK_IRQ(iSpinLock); |
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|
264 |
MM::MemoryLock(iMemory); |
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|
265 |
|
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|
266 |
if(iAllocatingSlab) |
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|
267 |
{ |
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|
268 |
// we've gone recursive... |
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|
269 |
__NK_ASSERT_DEBUG(iFreeCount); // check we still have some reserved objects |
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|
270 |
|
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|
271 |
// lie and pretend we've allocated a slab which will allow Alloc() to proceed... |
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|
272 |
MM::MemoryUnlock(iMemory); |
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|
273 |
__SPIN_LOCK_IRQ(iSpinLock); |
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|
274 |
return true; |
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|
275 |
} |
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|
276 |
|
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|
277 |
iAllocatingSlab = true; |
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|
278 |
|
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|
279 |
// still need new slab? |
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|
280 |
if(iFreeCount<=iReserveCount) |
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|
281 |
{ |
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|
282 |
// find unused slab... |
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|
283 |
TInt i = iSlabMap->Alloc(); |
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|
284 |
if(i<0) |
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|
285 |
break; // out of memory |
96e5fb8b040d
Revision: 200951
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|
286 |
|
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|
287 |
// commit memory for slab... |
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|
288 |
TInt r = MM::MemoryAlloc(iMemory,i,1); |
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|
289 |
if(r!=KErrNone) |
96e5fb8b040d
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|
290 |
{ |
96e5fb8b040d
Revision: 200951
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|
291 |
iSlabMap->Free(i); |
96e5fb8b040d
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|
292 |
break; // error |
96e5fb8b040d
Revision: 200951
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diff
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|
293 |
} |
96e5fb8b040d
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diff
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|
294 |
|
96e5fb8b040d
Revision: 200951
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|
295 |
// initialise slab... |
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Revision: 200951
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|
296 |
TLinAddr page = iBase+(i<<KPageShift); |
96e5fb8b040d
Revision: 200951
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|
297 |
InitSlab(page); |
96e5fb8b040d
Revision: 200951
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|
298 |
TRACE2(("RSlabAllocatorBase::NewSlab() allocated 0x%08x",(TSlabHeader*)(page+KPageSize)-1)); |
96e5fb8b040d
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|
299 |
} |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
300 |
|
96e5fb8b040d
Revision: 200951
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parents:
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|
301 |
iAllocatingSlab = false; |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
302 |
|
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
303 |
MM::MemoryUnlock(iMemory); |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
304 |
__SPIN_LOCK_IRQ(iSpinLock); |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
305 |
|
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
306 |
// still need new slab? |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
307 |
if(iFreeCount>iReserveCount) |
96e5fb8b040d
Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
308 |
return true; // no, so finish |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
309 |
} |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
310 |
|
96e5fb8b040d
Revision: 200951
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parents:
diff
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311 |
// failed... |
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iAllocatingSlab = false; |
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MM::MemoryUnlock(iMemory); |
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__SPIN_LOCK_IRQ(iSpinLock); |
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return false; |
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} |
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|
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|
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void RSlabAllocatorBase::InitSlab(TLinAddr aPage) |
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{ |
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TRACE2(("RSlabAllocatorBase::InitSlab(0x%08x)",aPage)); |
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|
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// header goes at end of slab... |
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TSlabHeader* slab = (TSlabHeader*)(aPage+KPageSize)-1; |
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325 |
|
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// link first object in slab onto the slab's free list... |
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SDblQueLink* head = &slab->iFreeList.iA; |
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SDblQueLink* first = (SDblQueLink*)aPage; |
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head->iNext = first; |
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head->iPrev = first; |
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first->iPrev = head; |
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first->iNext = head; |
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333 |
|
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// setup rest of slab header... |
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slab->iAllocCount = 0; |
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slab->iHighWaterMark = first; |
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337 |
|
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// put new slab at end of free slab list... |
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__SPIN_LOCK_IRQ(iSpinLock); |
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iFreeList.Add(slab); |
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iFreeCount += iObjectsPerSlab; |
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__SPIN_UNLOCK_IRQ(iSpinLock); |
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} |
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|
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345 |
|
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void RSlabAllocatorBase::FreeSlab(TSlabHeader* aSlab) |
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{ |
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TRACE2(("RSlabAllocatorBase::FreeSlab(0x%08x)",aSlab)); |
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|
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aSlab->Deque(); |
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iFreeCount -= iObjectsPerSlab; |
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__SPIN_UNLOCK_IRQ(iSpinLock); |
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|
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MM::MemoryLock(iMemory); |
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TUint i = ((TLinAddr)aSlab-iBase)>>KPageShift; |
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MM::MemoryFree(iMemory,i,1); |
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iSlabMap->Free(i); |
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MM::MemoryUnlock(iMemory); |
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} |
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360 |
|
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361 |
|
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362 |
// |
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// Cleanup |
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// |
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365 |
|
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void RSlabAllocatorBase::CleanupTrampoline(TAny* aSelf) |
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{ |
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((RSlabAllocatorBase*)aSelf)->Cleanup(); |
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} |
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370 |
|
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371 |
|
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void RSlabAllocatorBase::Cleanup() |
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373 |
{ |
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// free any empty slabs... |
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375 |
for(;;) |
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376 |
{ |
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__SPIN_LOCK_IRQ(iSpinLock); |
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TSlabHeader* slab = (TSlabHeader*)iFreeList.iA.iPrev; // get slab from end of list |
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if(slab==iFreeList.iA.iNext) |
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break; // only slab left, so leave it |
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if(slab->iAllocCount!=0) |
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break; // slab has allocated objects, so end, (empty slabs are always at end of list) |
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FreeSlab(slab); |
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384 |
} |
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385 |
__SPIN_UNLOCK_IRQ(iSpinLock); |
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386 |
} |