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Implement buffer return logic for general lookaside lists
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This commit is contained in:
Aiken Harris
2026-07-04 14:08:05 +02:00
parent 042bf8520c
commit a0e707d35f
2 changed files with 73 additions and 1 deletions
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70
xtoskrnl/ex/laslist.cc
View File

@@ -79,7 +79,6 @@ EX::LookasideList::AllocateFromLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideL
return Buffer;
}
/**
* Allocates a memory block from the specified per-processor lookaside list.
*
@@ -138,6 +137,75 @@ EX::LookasideList::AllocateFromPerProcessorList(IN NONPAGED_LOOKASIDE_NUMBER Num
return Entry;
}
/**
* Returns a previously allocated memory block to the specified non-paged lookaside list.
*
* @param LookasideList
* Supplies a pointer to the non-paged lookaside list.
*
* @param Entry
* Supplies a pointer to the memory block being freed.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
EX::LookasideList::FreeToLookasideList(IN PNONPAGED_LOOKASIDE_LIST LookasideList,
IN PVOID Entry)
{
/* Increment the tracking metric */
LookasideList->Global.TotalFrees++;
/* Verify if the lookaside list has reached its maximum capacity threshold */
if(RTL::SinglyList::QueryListDepth(&LookasideList->Global.ListHead) >= LookasideList->Global.Depth)
{
/* The list is full, record a capacity miss */
LookasideList->Global.FreeMisses++;
(LookasideList->Global.Free)(Entry);
}
else
{
/* Push the block onto the lookaside list */
RTL::Atomic::PushEntrySingleList(&LookasideList->Global.ListHead, (PSINGLE_LIST_ENTRY)Entry);
}
}
/**
* Returns a previously allocated memory block to the specified paged lookaside list.
*
* @param LookasideList
* Supplies a pointer to the paged lookaside list.
*
* @param Entry
* Supplies a pointer to the memory block being freed.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
EX::LookasideList::FreeToLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideList,
IN PVOID Entry)
{
/* Increment the tracking metric */
LookasideList->Global.TotalFrees++;
/* Verify if the lookaside list has reached its maximum capacity threshold */
if(RTL::SinglyList::QueryListDepth(&LookasideList->Global.ListHead) >= LookasideList->Global.Depth)
{
/* The list is full, record a capacity miss */
LookasideList->Global.FreeMisses++;
(LookasideList->Global.Free)(Entry);
}
else
{
/* Push the block onto the lookaside list */
RTL::Atomic::PushEntrySingleList(&LookasideList->Global.ListHead, (PSINGLE_LIST_ENTRY)Entry);
}
}
/**
* Frees a memory block back to the specified per-processor lookaside list.

4
xtoskrnl/includes/ex/laslist.hh
View File

@@ -31,6 +31,10 @@ namespace EX
STATIC XTAPI PVOID AllocateFromLookasideList(IN PNONPAGED_LOOKASIDE_LIST LookasideList);
STATIC XTAPI PVOID AllocateFromLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideList);
STATIC XTAPI PVOID AllocateFromPerProcessorList(IN NONPAGED_LOOKASIDE_NUMBER Number);
STATIC XTAPI VOID FreeToLookasideList(IN PNONPAGED_LOOKASIDE_LIST LookasideList,
IN PVOID Entry);
STATIC XTAPI VOID FreeToLookasideList(IN PPAGED_LOOKASIDE_LIST LookasideList,
IN PVOID Entry);
STATIC XTAPI VOID FreeToPerProcessorList(IN NONPAGED_LOOKASIDE_NUMBER Number,
IN PVOID Entry);
STATIC XTAPI VOID InitializeLookasideList(IN OUT PGENERAL_LOOKASIDE LookasideList,