LOGICAL
ExpScanGeneralLookasideList (
IN PLIST_ENTRY ListHead,
IN PKSPIN_LOCK SpinLock
)
/*++
Routine Description:
This function scans the specified list of general lookaside descriptors
and adjusts the maximum depth as necessary.
Arguments:
ListHead - Supplies the address of the listhead for a list of lookaside
descriptors.
SpinLock - Supplies the address of the spinlock to be used to synchronize
access to the list of lookaside descriptors.
Return Value:
A value of TRUE is returned if the maximum depth of any lookaside list
is changed. Otherwise, a value of FALSE is returned.
--*/
{
ULONG Allocates;
LOGICAL Changes;
PLIST_ENTRY Entry;
PPAGED_LOOKASIDE_LIST Lookaside;
ULONG Misses;
KIRQL OldIrql;
//
// Raise IRQL and acquire the specified spinlock.
//
Changes = FALSE;
ExAcquireSpinLock(SpinLock, &OldIrql);
//
// Scan the specified list of lookaside descriptors and adjust the
// maximum depth as necessary.
//
// N.B. All lookaside list descriptor are treated as if they were
// paged descriptor even though they may be nonpaged descriptors.
// This is possible since both structures are identical except
// for the locking fields which are the last structure fields.
Entry = ListHead->Flink;
while (Entry != ListHead) {
Lookaside = CONTAINING_RECORD(Entry,
PAGED_LOOKASIDE_LIST,
L.ListEntry);
//
// Compute the total number of allocations and misses per second for
// this scan period.
//
Allocates = Lookaside->L.TotalAllocates - Lookaside->L.LastTotalAllocates;
Lookaside->L.LastTotalAllocates = Lookaside->L.TotalAllocates;
Misses = Lookaside->L.AllocateMisses - Lookaside->L.LastAllocateMisses;
Lookaside->L.LastAllocateMisses = Lookaside->L.AllocateMisses;
//
// Compute target depth of lookaside list.
//
Changes |= ExpComputeLookasideDepth(Allocates,
Misses,
Lookaside->L.MaximumDepth,
&Lookaside->L.Depth);
Entry = Entry->Flink;
}
//
// Release spinlock, lower IRQL, and return function value.
//
ExReleaseSpinLock(SpinLock, OldIrql);
return Changes;
}
LOGICAL
ExpScanPoolLookasideList (
IN PLIST_ENTRY ListHead
)
/*++
Routine Description:
This function scans the specified pool lookaside descriptors and adjusts
the maximum depth as necessary.
Arguments:
ListHead - Supplies a pointer to the list of pool lookaside structures.
Return Value:
A value of TRUE is returned if the maximum depth of any lookaside list
is changed. Otherwise, a value of FALSE is returned.
--*/
{
ULONG Allocates;
LOGICAL Changes;
PNPAGED_LOOKASIDE_LIST Lookaside;
PLIST_ENTRY NextEntry;
ULONG Misses;
//
// Scan the specified list of lookaside descriptors and adjust the
// maximum depth as necessary.
//
Changes = FALSE;
NextEntry = ListHead->Flink;
while (NextEntry != ListHead) {
Lookaside = CONTAINING_RECORD(NextEntry,
NPAGED_LOOKASIDE_LIST,
L.ListEntry);
//
// Compute the total number of allocations and misses per second for
// this scan period.
//
Allocates = Lookaside->L.TotalAllocates - Lookaside->L.LastTotalAllocates;
Lookaside->L.LastTotalAllocates = Lookaside->L.TotalAllocates;
Misses = Allocates - (Lookaside->L.AllocateHits - Lookaside->L.LastAllocateHits);
Lookaside->L.LastAllocateHits = Lookaside->L.AllocateHits;
//
// Compute target depth of lookaside list.
//
Changes |= ExpComputeLookasideDepth(Allocates,
Misses,
Lookaside->L.MaximumDepth,
&Lookaside->L.Depth);
NextEntry = NextEntry->Flink;
}
return Changes;
}
LOGICAL
ExpScanPoolLookasideList (
IN PSMALL_POOL_LOOKASIDE Lookaside
)
/*++
Routine Description:
This function scans the specified pool lookaside descriptors and adjusts
the maximum depth as necessary.
Arguments:
Lookaside - Supplies a pointer to the first small pool lookaside list
descritor.
Return Value:
A value of TRUE is returned if the maximum depth of any lookaside list
is changed. Otherwise, a value of FALSE is returned.
--*/
{
ULONG Allocates;
LOGICAL Changes;
ULONG Index;
ULONG Misses;
//
// Scan the specified list of lookaside descriptors and adjust the
// maximum depth as necessary.
//
Changes = FALSE;
for (Index = 0; Index < POOL_SMALL_LISTS; Index += 1) {
//
// Compute the total number of allocations and misses per second for
// this scan period.
//
Allocates = Lookaside->TotalAllocates - Lookaside->LastTotalAllocates;
Lookaside->LastTotalAllocates = Lookaside->TotalAllocates;
Misses = Allocates - (Lookaside->AllocateHits - Lookaside->LastAllocateHits);
Lookaside->LastAllocateHits = Lookaside->AllocateHits;
//
// Compute target depth of lookaside list.
//
Changes |= ExpComputeLookasideDepth(Allocates,
Misses,
Lookaside->MaximumDepth,
&Lookaside->Depth);
Lookaside += 1;
}
return Changes;
}
