396 lines
13 KiB
C++
396 lines
13 KiB
C++
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ex/laslist.cc
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* DESCRIPTION: Lookaside Lists support
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.hh>
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/**
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* Attempts to allocate a fixed-size buffer from the specified non-paged lookaside list.
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*
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* @param LookasideList
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* Supplies a pointer to the non-paged lookaside list.
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*
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* @return Returns a pointer to the allocated buffer, or NULLPTR if the allocation fails.
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*
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* @since XT 1.0
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*/
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XTAPI
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PVOID
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EX::LookasideList::AllocateFromLookasideList(IN PNONPAGED_LOOKASIDE_LIST LookasideList)
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{
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PVOID Buffer;
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/* Increment the total number of allocation requests */
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LookasideList->Global.TotalAllocates++;
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/* Attempt to pop an entry from the lookaside list */
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Buffer = RTL::Atomic::PopEntrySingleList(&LookasideList->Global.ListHead);
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if(!Buffer)
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{
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/* Increment the miss counter */
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LookasideList->Global.AllocateMisses++;
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/* Fallback to standard pool allocator */
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(LookasideList->Global.Allocate)(LookasideList->Global.Type, LookasideList->Global.Size,
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&Buffer, LookasideList->Global.Tag);
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}
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/* Return the allocated buffer */
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return Buffer;
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}
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/**
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* Attempts to allocate a fixed-size buffer from the specified paged lookaside list.
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*
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* @param LookasideList
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* Supplies a pointer to the paged lookaside list.
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*
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* @return Returns a pointer to the allocated buffer, or NULLPTR if the allocation fails.
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*
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* @since XT 1.0
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*/
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XTAPI
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PVOID
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EX::LookasideList::AllocateFromLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideList)
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{
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PVOID Buffer;
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/* Increment the total number of allocation requests */
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LookasideList->Global.TotalAllocates++;
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/* Attempt to pop an entry from the lookaside list */
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Buffer = RTL::Atomic::PopEntrySingleList(&LookasideList->Global.ListHead);
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if(!Buffer)
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{
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/* Increment the miss counter */
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LookasideList->Global.AllocateMisses++;
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/* Fallback to standard pool allocator */
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(LookasideList->Global.Allocate)(LookasideList->Global.Type, LookasideList->Global.Size,
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&Buffer, LookasideList->Global.Tag);
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}
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/* Return the allocated buffer */
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return Buffer;
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}
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/**
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* Allocates a memory block from the specified per-processor lookaside list.
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*
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* @param Number
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* Supplies the index of the lookaside list to allocate from.
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*
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* @return This routine returns a pointer to the allocated memory block, or NULLPTR if allocation fails.
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*
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* @since XT 1.0
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*/
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XTAPI
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PVOID
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EX::LookasideList::AllocateFromPerProcessorList(IN NONPAGED_LOOKASIDE_NUMBER Number)
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{
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PKPROCESSOR_CONTROL_BLOCK Prcb;
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PGENERAL_LOOKASIDE Lookaside;
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PVOID Entry;
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/* Retrieve the current Processor Control Block */
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Prcb = KE::Processor::GetCurrentProcessorControlBlock();
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/* Target the processor's local lookaside list and increment the tracking metric */
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Lookaside = Prcb->LookasideList[Number].Local;
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Lookaside->TotalAllocates++;
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/* Attempt a pop from the local list */
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Entry = RTL::Atomic::PopEntrySingleList(&Lookaside->ListHead);
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if(Entry != NULLPTR)
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{
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/* Return the retrieved a pre-allocated block */
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return Entry;
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}
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/* Record a local cache miss */
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Lookaside->AllocateMisses++;
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Lookaside->TotalAllocates++;
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/* Switch the target to the shared global lookaside list */
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Lookaside = Prcb->LookasideList[Number].Global;
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/* Attempt a pop from the global list */
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Entry = RTL::Atomic::PopEntrySingleList(&Lookaside->ListHead);
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if(Entry != NULLPTR)
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{
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/* Return the retrieved a pre-allocated block */
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return Entry;
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}
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/* Both caches are saturated, record a miss */
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Lookaside->AllocateMisses++;
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/* Invoke the pool allocator */
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(Lookaside->Allocate)(Lookaside->Type, Lookaside->Size, &Entry, Lookaside->Tag);
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/* Return the newly allocated block */
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return Entry;
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}
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/**
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* Returns a previously allocated memory block to the specified non-paged lookaside list.
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*
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* @param LookasideList
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* Supplies a pointer to the non-paged lookaside list.
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*
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* @param Entry
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* Supplies a pointer to the memory block being freed.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::FreeToLookasideList(IN PNONPAGED_LOOKASIDE_LIST LookasideList,
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IN PVOID Entry)
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{
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/* Increment the tracking metric */
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LookasideList->Global.TotalFrees++;
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/* Verify if the lookaside list has reached its maximum capacity threshold */
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if(RTL::SinglyList::QueryListDepth(&LookasideList->Global.ListHead) >= LookasideList->Global.Depth)
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{
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/* The list is full, record a capacity miss */
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LookasideList->Global.FreeMisses++;
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(LookasideList->Global.Free)(Entry);
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}
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else
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{
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/* Push the block onto the lookaside list */
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RTL::Atomic::PushEntrySingleList(&LookasideList->Global.ListHead, (PSINGLE_LIST_ENTRY)Entry);
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}
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}
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/**
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* Returns a previously allocated memory block to the specified paged lookaside list.
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*
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* @param LookasideList
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* Supplies a pointer to the paged lookaside list.
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*
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* @param Entry
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* Supplies a pointer to the memory block being freed.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::FreeToLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideList,
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IN PVOID Entry)
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{
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/* Increment the tracking metric */
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LookasideList->Global.TotalFrees++;
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/* Verify if the lookaside list has reached its maximum capacity threshold */
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if(RTL::SinglyList::QueryListDepth(&LookasideList->Global.ListHead) >= LookasideList->Global.Depth)
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{
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/* The list is full, record a capacity miss */
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LookasideList->Global.FreeMisses++;
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(LookasideList->Global.Free)(Entry);
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}
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else
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{
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/* Push the block onto the lookaside list */
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RTL::Atomic::PushEntrySingleList(&LookasideList->Global.ListHead, (PSINGLE_LIST_ENTRY)Entry);
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}
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}
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/**
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* Frees a memory block back to the specified per-processor lookaside list.
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*
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* @param Number
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* Supplies the index of the lookaside list receiving the freed block.
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*
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* @param Entry
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* Supplies a pointer to the memory block being freed.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::FreeToPerProcessorList(IN NONPAGED_LOOKASIDE_NUMBER Number,
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IN PVOID Entry)
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{
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PKPROCESSOR_CONTROL_BLOCK Prcb;
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PGENERAL_LOOKASIDE Lookaside;
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/* Retrieve the current Processor Control Block */
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Prcb = KE::Processor::GetCurrentProcessorControlBlock();
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/* Target the processor's local lookaside list and increment the tracking metric */
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Lookaside = Prcb->LookasideList[Number].Local;
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Lookaside->TotalFrees += 1;
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/* Check if the lookaside list has reached its maximum capacity threshold */
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if(RTL::SinglyList::QueryListDepth(&Lookaside->ListHead) >= Lookaside->Depth)
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{
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/* The local list is full, record a capacity miss */
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Lookaside->FreeMisses++;
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Lookaside->TotalFrees++;
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/* Switch the target to the shared global lookaside list */
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Lookaside = Prcb->LookasideList[Number].Global;
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/* Check if the lookaside list has reached its maximum capacity threshold */
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if(RTL::SinglyList::QueryListDepth(&Lookaside->ListHead) >= Lookaside->Depth)
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{
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/* Both caches are saturated, record a miss */
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Lookaside->FreeMisses++;
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(Lookaside->Free)(Entry);
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/* Exit the routine */
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return;
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}
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}
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/* Push the block onto the selected lookaside list */
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RTL::Atomic::PushEntrySingleList(&Lookaside->ListHead, (PSINGLE_LIST_ENTRY)Entry);
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}
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/**
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* Initializes a generic lookaside list and inserts it into the tracking list.
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*
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* @param LookasideList
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* Supplies a pointer to the general lookaside list structure to initialize.
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*
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* @param PoolType
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* Supplies the type of memory pool to be allocated.
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*
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* @param Size
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* Supplies the size, in bytes, of the entries to be allocated from the lookaside list.
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*
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* @param Tag
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* Supplies the pool tag to be used for allocations.
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*
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* @param MaxDepth
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* Supplies the maximum number of entries the lookaside list should hold.
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*
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* @param ListHead
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* Supplies a pointer to the linked list header used to track this lookaside list.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::InitializeLookasideList(IN OUT PGENERAL_LOOKASIDE LookasideList,
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IN MMPOOL_TYPE PoolType,
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IN ULONG Size,
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IN ULONG Tag,
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IN USHORT MaxDepth,
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IN PLIST_ENTRY ListHead)
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{
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/* Initialize the singly linked list header and insert it into the tracking list */
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RTL::SinglyList::InitializeListHead(&LookasideList->ListHead);
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RTL::LinkedList::InsertTailList(ListHead, &LookasideList->ListEntry);
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/* Initialize lookaside list properties */
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LookasideList->Allocate = &MM::Allocator::AllocatePool;
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LookasideList->AllocateHits = 0;
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LookasideList->Depth = 2;
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LookasideList->Free = &MM::Allocator::FreePool;
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LookasideList->FreeHits = 0;
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LookasideList->LastAllocateHits = 0;
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LookasideList->LastTotalAllocates = 0;
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LookasideList->MaximumDepth = MaxDepth;
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LookasideList->Size = Size;
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LookasideList->Tag = Tag;
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LookasideList->TotalAllocates = 0;
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LookasideList->TotalFrees = 0;
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LookasideList->Type = PoolType;
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}
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/**
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* Initializes the per-processor lookaside list pointers.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::InitializePointers(VOID)
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{
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PGENERAL_LOOKASIDE LookasideEntry;
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PKPROCESSOR_CONTROL_BLOCK Prcb;
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ULONG Index;
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/* Retrieve the processor control block */
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Prcb = KE::Processor::GetCurrentProcessorControlBlock();
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/* Initialize both non-paged and paged lookaside lists for all pool indexes */
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for(Index = 0; Index < POOL_LOOKASIDE_LISTS; Index++)
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{
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/* Get the non-paged lookaside list entry */
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LookasideEntry = &NonPagedPoolLookasideLists[Index];
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/* Initialize the singly linked list header for the non-paged entry */
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RTL::SinglyList::InitializeListHead(&LookasideEntry->ListHead);
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/* Assign the initialized non-paged entry to the PRCB */
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Prcb->NonPagedLookasideList[Index].Global = LookasideEntry;
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Prcb->NonPagedLookasideList[Index].Local = LookasideEntry;
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/* Get the paged lookaside list entry */
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LookasideEntry = &PagedPoolLookasideLists[Index];
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/* Initialize the singly linked list header for the paged entry */
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RTL::SinglyList::InitializeListHead(&LookasideEntry->ListHead);
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/* Assign the initialized paged entry to the PRCB */
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Prcb->PagedLookasideList[Index].Global = LookasideEntry;
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Prcb->PagedLookasideList[Index].Local = LookasideEntry;
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}
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}
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/**
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* Initializes global system lookaside lists and their synchronization primitives.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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EX::LookasideList::InitializeSystemLookasideLists(VOID)
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{
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ULONG Index;
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/* Initialize spinlocks for protecting lookaside list operations */
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KE::SpinLock::InitializeSpinLock(&NonPagedLookasideListLock);
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KE::SpinLock::InitializeSpinLock(&PagedLookasideListLock);
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/* Initialize global list heads for tracking various types of lookaside lists */
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RTL::LinkedList::InitializeListHead(&NonPagedLookasideListHead);
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RTL::LinkedList::InitializeListHead(&PagedLookasideListHead);
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RTL::LinkedList::InitializeListHead(&PoolLookasideListHead);
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RTL::LinkedList::InitializeListHead(&SystemLookasideListHead);
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/* Initialize standard pool lookaside lists */
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for(Index = 0; Index < POOL_LOOKASIDE_LISTS; Index++)
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{
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/* Initialize non-paged pool lookaside list */
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InitializeLookasideList(&NonPagedPoolLookasideLists[Index], NonPagedPool, (Index + 1) * 8,
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TAG_MM_MEMORY_POOL, 256, &PoolLookasideListHead);
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/* Initialize paged pool lookaside list */
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InitializeLookasideList(&PagedPoolLookasideLists[Index], PagedPool, (Index + 1) * 8,
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TAG_MM_MEMORY_POOL, 256, &PoolLookasideListHead);
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}
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}
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