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[NTOS:MM] In page zeroing thread, zero more than one page at a time.

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This commit is contained in:
Jérôme Gardou 2021-08-02 18:46:05 +02:00 committed by Jérôme Gardou
parent e98de5ef1f
commit 98e62b9bca
1 changed files with 47 additions and 30 deletions
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77
ntoskrnl/mm/ARM3/zeropage.c
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@ -38,10 +38,6 @@ MmZeroPageThread(VOID)
PKTHREAD Thread = KeGetCurrentThread();
PVOID StartAddress, EndAddress;
PVOID WaitObjects[2];
KIRQL OldIrql;
PVOID ZeroAddress;
PFN_NUMBER PageIndex, FreePage;
PMMPFN Pfn1;
/* Get the discardable sections to free them */
MiFindInitializationCode(&StartAddress, &EndAddress);
@ -58,6 +54,8 @@ MmZeroPageThread(VOID)
while (TRUE)
{
KIRQL OldIrql;
KeWaitForMultipleObjects(1, // 2
WaitObjects,
WaitAny,
@ -70,41 +68,60 @@ MmZeroPageThread(VOID)
while (TRUE)
{
if (!MmFreePageListHead.Total)
ULONG PageCount = 0;
PMMPFN Pfn1 = (PMMPFN)LIST_HEAD;
PVOID ZeroAddress;
PFN_NUMBER PageIndex, FreePage;
while (PageCount < MI_ZERO_PTES)
{
PMMPFN Pfn2;
if (!MmFreePageListHead.Total)
break;
PageIndex = MmFreePageListHead.Flink;
ASSERT(PageIndex != LIST_HEAD);
MI_SET_USAGE(MI_USAGE_ZERO_LOOP);
MI_SET_PROCESS2("Kernel 0 Loop");
FreePage = MiRemoveAnyPage(MI_GET_PAGE_COLOR(PageIndex));
/* The first global free page should also be the first on its own list */
if (FreePage != PageIndex)
{
KeBugCheckEx(PFN_LIST_CORRUPT,
0x8F,
FreePage,
PageIndex,
0);
}
Pfn2 = MiGetPfnEntry(PageIndex);
Pfn2->u1.Flink = (PFN_NUMBER)Pfn1;
Pfn1 = Pfn2;
PageCount++;
}
MiReleasePfnLock(OldIrql);
if (PageCount == 0)
{
KeClearEvent(&MmZeroingPageEvent);
MiReleasePfnLock(OldIrql);
break;
}
PageIndex = MmFreePageListHead.Flink;
ASSERT(PageIndex != LIST_HEAD);
Pfn1 = MiGetPfnEntry(PageIndex);
MI_SET_USAGE(MI_USAGE_ZERO_LOOP);
MI_SET_PROCESS2("Kernel 0 Loop");
FreePage = MiRemoveAnyPage(MI_GET_PAGE_COLOR(PageIndex));
/* The first global free page should also be the first on its own list */
if (FreePage != PageIndex)
{
KeBugCheckEx(PFN_LIST_CORRUPT,
0x8F,
FreePage,
PageIndex,
0);
}
Pfn1->u1.Flink = LIST_HEAD;
MiReleasePfnLock(OldIrql);
ZeroAddress = MiMapPagesInZeroSpace(Pfn1, 1);
ZeroAddress = MiMapPagesInZeroSpace(Pfn1, PageCount);
ASSERT(ZeroAddress);
KeZeroPages(ZeroAddress, PAGE_SIZE);
MiUnmapPagesInZeroSpace(ZeroAddress, 1);
KeZeroPages(ZeroAddress, PageCount * PAGE_SIZE);
MiUnmapPagesInZeroSpace(ZeroAddress, PageCount);
OldIrql = MiAcquirePfnLock();
MiInsertPageInList(&MmZeroedPageListHead, PageIndex);
while (Pfn1 != (PMMPFN)LIST_HEAD)
{
PageIndex = MiGetPfnEntryIndex(Pfn1);
Pfn1 = (PMMPFN)Pfn1->u1.Flink;
MiInsertPageInList(&MmZeroedPageListHead, PageIndex);
}
}
}
}