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Zero pages before allocated.

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svn path=/trunk/; revision=2323
This commit is contained in:
David Welch 2001-10-29 02:39:38 +00:00
parent 2a1ac328ed
commit 6efd918a8b
2 changed files with 43 additions and 29 deletions
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54
reactos/ntoskrnl/mm/freelist.c
View file

@ -42,7 +42,8 @@ static PPHYSICAL_PAGE MmPageArray;
static LIST_ENTRY UsedPageListHead;
static KSPIN_LOCK PageListLock;
static LIST_ENTRY FreePageListHead;
static LIST_ENTRY FreeZeroedPageListHead;
static LIST_ENTRY FreeUnzeroedPageListHead;
static LIST_ENTRY BiosPageListHead;
NTSTATUS
@ -137,7 +138,7 @@ VOID MiParseRangeToFreeList(
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
}
@ -230,7 +231,8 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
InitializeListHead(&UsedPageListHead);
KeInitializeSpinLock(&PageListLock);
InitializeListHead(&FreePageListHead);
InitializeListHead(&FreeUnzeroedPageListHead);
InitializeListHead(&FreeZeroedPageListHead);
InitializeListHead(&BiosPageListHead);
Reserved =
@ -295,7 +297,7 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
MmStats.NrSystemPages +=
@ -312,7 +314,7 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
MmStats.NrReservedPages += ((0x100000/PAGESIZE) - i);
@ -331,7 +333,7 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
MmStats.NrReservedPages += (0x60000 / PAGESIZE);
@ -347,7 +349,7 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
MmStats.NrSystemPages +=
@ -366,7 +368,7 @@ PVOID MmInitializePageList(PVOID FirstPhysKernelAddress,
{
MmPageArray[i].Flags = MM_PHYSICAL_PAGE_FREE;
MmPageArray[i].ReferenceCount = 0;
InsertTailList(&FreePageListHead,
InsertTailList(&FreeUnzeroedPageListHead,
&MmPageArray[i].ListEntry);
}
@ -574,7 +576,7 @@ VOID MmDereferencePage(PVOID PhysicalAddress)
KeBugCheck(0);
}
MmPageArray[Start].Flags = MM_PHYSICAL_PAGE_FREE;
InsertTailList(&FreePageListHead, &MmPageArray[Start].ListEntry);
InsertTailList(&FreeUnzeroedPageListHead, &MmPageArray[Start].ListEntry);
}
KeReleaseSpinLock(&PageListLock, oldIrql);
}
@ -662,21 +664,34 @@ MmAllocPage(SWAPENTRY SavedSwapEntry)
PLIST_ENTRY ListEntry;
PPHYSICAL_PAGE PageDescriptor;
KIRQL oldIrql;
BOOLEAN NeedClear = FALSE;
DPRINT("MmAllocPage()\n");
KeAcquireSpinLock(&PageListLock, &oldIrql);
if (IsListEmpty(&FreePageListHead))
if (IsListEmpty(&FreeZeroedPageListHead))
{
if (IsListEmpty(&FreeUnzeroedPageListHead))
{
DPRINT1("MmAllocPage(): Out of memory\n");
KeReleaseSpinLock(&PageListLock, oldIrql);
return(NULL);
}
ListEntry = RemoveTailList(&FreePageListHead);
ListEntry = RemoveTailList(&FreeUnzeroedPageListHead);
PageDescriptor = CONTAINING_RECORD(ListEntry, PHYSICAL_PAGE, ListEntry);
KeReleaseSpinLock(&PageListLock, oldIrql);
NeedClear = TRUE;
}
else
{
ListEntry = RemoveTailList(&FreeZeroedPageListHead);
KeReleaseSpinLock(&PageListLock, oldIrql);
PageDescriptor = CONTAINING_RECORD(ListEntry, PHYSICAL_PAGE, ListEntry);
DPRINT("PageDescriptor %x\n",PageDescriptor);
}
if (PageDescriptor->Flags != MM_PHYSICAL_PAGE_FREE)
{
DbgPrint("Got non-free page from freelist\n");
@ -687,18 +702,17 @@ MmAllocPage(SWAPENTRY SavedSwapEntry)
PageDescriptor->LockCount = 0;
PageDescriptor->MapCount = 0;
PageDescriptor->SavedSwapEntry = SavedSwapEntry;
ExInterlockedInsertTailList(&UsedPageListHead, ListEntry,
&PageListLock);
DPRINT("PageDescriptor %x MmPageArray %x\n", PageDescriptor, MmPageArray);
offset = (ULONG)((ULONG)PageDescriptor - (ULONG)MmPageArray);
DPRINT("offset %x\n",offset);
offset = offset / sizeof(PHYSICAL_PAGE) * PAGESIZE;
DPRINT("offset %x\n",offset);
ExInterlockedInsertTailList(&UsedPageListHead, ListEntry, &PageListLock);
MmStats.NrSystemPages++;
MmStats.NrFreePages--;
offset = (ULONG)((ULONG)PageDescriptor - (ULONG)MmPageArray);
offset = (offset / sizeof(PHYSICAL_PAGE)) * PAGESIZE;
if (NeedClear)
{
MiZeroPage(offset);
}
DPRINT("MmAllocPage() = %x\n",offset);
return((PVOID)offset);
}

2
reactos/ntoskrnl/mm/npool.c
View file

@ -1,4 +1,4 @@
/* $Id: npool.c,v 1.47 2001/09/29 19:40:49 phreak Exp $
/* $Id: npool.c,v 1.48 2001/10/29 02:39:38 dwelch Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel