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windows-xp/Source/XPSP1/NT/base/ntos/mm/mirror.c

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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
mirror.c
Abstract:
This module contains the routines to support memory mirroring.
Author:
Landy Wang (landyw) 17-Jan-2000
Revision History:
--*/
#include "mi.h"
#define MIRROR_MAX_PHASE_ZERO_PASSES 8
//
// This is set via the registry.
//
ULONG MmMirroring = 0;
//
// These bitmaps are allocated at system startup if the
// registry key above is set.
//
PRTL_BITMAP MiMirrorBitMap;
PRTL_BITMAP MiMirrorBitMap2;
//
// This is set if a mirroring operation is in progress.
//
LOGICAL MiMirroringActive = FALSE;
extern LOGICAL MiZeroingDisabled;
#if DBG
ULONG MiMirrorDebug = 1;
ULONG MiMirrorPassMax[2];
#endif
#pragma alloc_text(PAGELK, MmCreateMirror)
NTSTATUS
MmCreateMirror (
VOID
)
{
KIRQL OldIrql;
KIRQL ExitIrql;
ULONG Limit;
ULONG Color;
ULONG IterationCount;
PMMPFN Pfn1;
PMMPFNLIST ListHead;
PFN_NUMBER PreviousPage;
PFN_NUMBER ThisPage;
PFN_NUMBER PageFrameIndex;
MMLISTS MemoryList;
ULONG LengthOfClearRun;
ULONG LengthOfSetRun;
ULONG StartingRunIndex;
ULONG BitMapIndex;
ULONG BitMapHint;
ULONG BitMapBytes;
PULONG BitMap1;
PULONG BitMap2;
PHYSICAL_ADDRESS PhysicalAddress;
LARGE_INTEGER PhysicalBytes;
NTSTATUS Status;
ULONG BitMapSize;
PFN_NUMBER PagesWritten;
PFN_NUMBER PagesWrittenLast;
#if DBG
ULONG PassMaxRun;
PFN_NUMBER PagesVerified;
#endif
ASSERT (KeGetCurrentIrql() == PASSIVE_LEVEL);
if ((MmMirroring & MM_MIRRORING_ENABLED) == 0) {
return STATUS_NOT_SUPPORTED;
}
if (MiMirrorBitMap == NULL) {
return STATUS_INSUFFICIENT_RESOURCES;
}
if ((ExVerifySuite(DataCenter) == TRUE) ||
((MmProductType != 0x00690057) && (ExVerifySuite(Enterprise) == TRUE))) {
//
// DataCenter and Advanced Server are the only appropriate mirroring
// platforms, allow them to proceed.
//
NOTHING;
}
else {
return STATUS_LICENSE_VIOLATION;
}
//
// Serialize here with dynamic memory additions and removals.
//
ExAcquireFastMutex (&MmDynamicMemoryMutex);
ASSERT (MiMirroringActive == FALSE);
MmLockPagableSectionByHandle (ExPageLockHandle);
//
// Setting all the bits here states all the pages need to be mirrored.
// In the Phase0 loop below, the bits will be cleared as pages are
// found on the lists and marked to be sent to the mirror. Bits are
// set again if the pages are reclaimed for active use.
//
RtlSetAllBits (MiMirrorBitMap2);
//
// Put all readonly nonpaged kernel and HAL subsection pages into the
// Phase0 list. The only way these could get written between Phase0
// starting and Phase1 ending is via debugger breakpoints and those
// don't matter. This is worth a couple of megabytes and could be done
// at some point in the future if a reasonable perf gain can be shown.
//
MiZeroingDisabled = TRUE;
IterationCount = 0;
//
// Compute initial "pages copied" so convergence can be ascertained
// in the main loop below.
//
PagesWrittenLast = 0;
#if DBG
if (MiMirrorDebug != 0) {
for (MemoryList = ZeroedPageList; MemoryList <= ModifiedNoWritePageList; MemoryList += 1) {
PagesWrittenLast += (PFN_COUNT)MmPageLocationList[MemoryList]->Total;
}
DbgPrint ("Mirror P0 starting with %x pages\n", PagesWrittenLast);
PagesWrittenLast = 0;
}
#endif
//
// Initiate Phase0 copying.
// Inform the HAL so it can initialize if need be.
//
Status = HalStartMirroring ();
if (!NT_SUCCESS(Status)) {
MmUnlockPagableImageSection(ExPageLockHandle);
MiZeroingDisabled = FALSE;
ASSERT (MiMirroringActive == FALSE);
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}
//
// Scan system memory and mirror pages until a pass
// doesn't find many pages to transfer.
//
do {
//
// The list of pages to be transferred on this iteration will be
// formed in the MiMirrorBitMap array. Clear out prior usage.
//
RtlClearAllBits (MiMirrorBitMap);
//
// Trim all pages from all process working sets so that as many pages
// as possible will be on the standby, modified and modnowrite lists.
// These lists are written during Phase0 mirroring where locks are
// not held and thus the system is still somewhat operational from
// an application's perspective.
//
MmEmptyAllWorkingSets ();
MiFreeAllExpansionNonPagedPool (FALSE);
LOCK_PFN (OldIrql);
//
// Scan all the page lists so they can be copied during Phase0
// mirroring.
//
for (MemoryList = ZeroedPageList; MemoryList <= ModifiedNoWritePageList; MemoryList += 1) {
ListHead = MmPageLocationList[MemoryList];
if (ListHead->Total == 0) {
continue;
}
if ((MemoryList == ModifiedPageList) &&
(ListHead->Total == MmTotalPagesForPagingFile)) {
continue;
}
PageFrameIndex = ListHead->Flink;
do {
//
// The scan is operating via the lists rather than the PFN
// entries as read-in-progress pages are not on lists and
// therefore do not have to be special cased here and elsewhere.
//
Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
ASSERT (Pfn1->u3.e1.ReadInProgress == 0);
//
// Setting the bit in BitMap means this page is to be copied
// in this Phase0 iteration. If it is reused after this
// point (as indicated by its bit being set again in BitMap2),
// it will be recopied on a later iteration or in Phase1.
//
if (RtlCheckBit(MiMirrorBitMap2, (ULONG)PageFrameIndex)) {
RtlSetBit (MiMirrorBitMap, (ULONG)PageFrameIndex);
RtlClearBit (MiMirrorBitMap2, (ULONG)PageFrameIndex);
}
PageFrameIndex = Pfn1->u1.Flink;
} while (PageFrameIndex != MM_EMPTY_LIST);
}
//
// Scan for modified pages destined for the paging file.
//
for (Color = 0; Color < MM_MAXIMUM_NUMBER_OF_COLORS; Color += 1) {
ListHead = &MmModifiedPageListByColor[Color];
if (ListHead->Total == 0) {
continue;
}
PageFrameIndex = ListHead->Flink;
do {
//
// The scan is operating via the lists rather than the PFN
// entries as read-in-progress are not on lists. Thus this
// case does not have to be handled here and just works out.
//
Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
ASSERT (Pfn1->u3.e1.ReadInProgress == 0);
//
// Setting the bit in BitMap means this page is to be copied
// on this iteration of Phase0. If it is reused after this
// point (as indicated by its bit being set again in BitMap2),
// it will be recopied on a later iteration or in Phase1.
//
if (RtlCheckBit(MiMirrorBitMap2, (ULONG)PageFrameIndex)) {
RtlSetBit (MiMirrorBitMap, (ULONG)PageFrameIndex);
RtlClearBit (MiMirrorBitMap2, (ULONG)PageFrameIndex);
}
PageFrameIndex = Pfn1->u1.Flink;
} while (PageFrameIndex != MM_EMPTY_LIST);
}
#if DBG
if (MiMirrorDebug != 0) {
DbgPrint ("Mirror P0 pass %d: Transfer %x pages\n",
IterationCount,
RtlNumberOfSetBits(MiMirrorBitMap));
}
#endif
MiMirroringActive = TRUE;
//
// The dirty PFN bitmap has been initialized and the flag set.
// There are very intricate rules governing how different places in
// memory management MUST update the bitmap when we are in this mode.
//
// The rules are:
//
// Anyone REMOVING a page from the zeroed, free, transition, modified
// or modnowrite lists must update the bitmap IFF that page could
// potentially be subsequently modified. Pages that are in transition
// BUT NOT on one of these lists (ie inpages, freed pages that are
// dangling due to nonzero reference counts, etc) do NOT need to
// update the bitmap as they are not one of these lists. If the page
// is removed from one of the five lists just to be immediately
// placed--without modification--on another list, then the bitmap
// does NOT need updating.
//
// Therefore :
//
// MiUnlinkPageFromList updates the bitmap. While some callers
// immediately put a page acquired this way back on one of the 3 lists
// above, this is generally rare. Having this routine update the
// bitmap means cases like restoring a transition PTE "just work".
//
// Callers of MiRemovePageFromList where list >= Transition, must do the
// bitmap updates as only they know if the page is immediately going
// back to one of the five lists above or being
// reused (reused == update REQUIRED).
//
// MiRemoveZeroPage updates the bitmap as the page is immediately
// going to be modified. MiRemoveAnyPage does this also.
//
// Inserts into ANY list do not need to update bitmaps, as a remove had
// to occur first (which would do the update) or it wasn't on a list to
// begin with and thus wasn't subtracted above and therefore doesn't
// need to update the bitmap either.
//
UNLOCK_PFN (OldIrql);
BitMapHint = 0;
PagesWritten = 0;
#if DBG
PassMaxRun = 0;
#endif
do {
BitMapIndex = RtlFindSetBits (MiMirrorBitMap, 1, BitMapHint);
if (BitMapIndex < BitMapHint) {
break;
}
if (BitMapIndex == NO_BITS_FOUND) {
break;
}
//
// Found at least one page to copy - try for a cluster.
//
LengthOfClearRun = RtlFindNextForwardRunClear (MiMirrorBitMap,
BitMapIndex,
&StartingRunIndex);
if (LengthOfClearRun != 0) {
LengthOfSetRun = StartingRunIndex - BitMapIndex;
}
else {
LengthOfSetRun = MiMirrorBitMap->SizeOfBitMap - BitMapIndex;
}
PagesWritten += LengthOfSetRun;
#if DBG
if (LengthOfSetRun > PassMaxRun) {
PassMaxRun = LengthOfSetRun;
}
#endif
//
// Write out the page(s).
//
PhysicalAddress.QuadPart = BitMapIndex;
PhysicalAddress.QuadPart = PhysicalAddress.QuadPart << PAGE_SHIFT;
PhysicalBytes.QuadPart = LengthOfSetRun;
PhysicalBytes.QuadPart = PhysicalBytes.QuadPart << PAGE_SHIFT;
Status = HalMirrorPhysicalMemory (PhysicalAddress, PhysicalBytes);
if (!NT_SUCCESS(Status)) {
MiZeroingDisabled = FALSE;
MmUnlockPagableImageSection(ExPageLockHandle);
MiMirroringActive = FALSE;
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}
BitMapHint = BitMapIndex + LengthOfSetRun + LengthOfClearRun;
} while (BitMapHint < MiMirrorBitMap->SizeOfBitMap);
ASSERT (RtlNumberOfSetBits(MiMirrorBitMap) == PagesWritten);
#if DBG
if (PassMaxRun > MiMirrorPassMax[0]) {
MiMirrorPassMax[0] = PassMaxRun;
}
if (MiMirrorDebug != 0) {
DbgPrint ("Mirror P0 pass %d: ended with %x (last= %x) pages\n",
IterationCount, PagesWritten, PagesWrittenLast);
}
#endif
ASSERT (MiMirroringActive == TRUE);
//
// Stop when PagesWritten by the current pass is not somewhat
// better than the preceeding pass. If improvement is vanishing,
// the method is at the steady state where working set removals and
// transition faults are in balance. Also stop if PagesWritten is
// small in absolute terms. Finally, there is a limit on iterations
// for the misbehaving cases.
//
if (((PagesWritten > PagesWrittenLast - 256) && (IterationCount > 0)) ||
(PagesWritten < 1024)) {
break;
}
ASSERT (MiMirroringActive == TRUE);
PagesWrittenLast = PagesWritten;
IterationCount += 1;
} while (IterationCount < MIRROR_MAX_PHASE_ZERO_PASSES);
ASSERT (MiMirroringActive == TRUE);
//
// Notify the HAL that Phase0 is complete. The HAL is responsible for
// doing things like disabling interrupts, processors and preparing the
// hardware for Phase1. Note that some HALs may return from this
// call at DISPATCH_LEVEL, so snap current IRQL now.
//
ExitIrql = KeGetCurrentIrql ();
ASSERT (ExitIrql == APC_LEVEL);
Status = HalEndMirroring (0);
if (!NT_SUCCESS(Status)) {
ASSERT (KeGetCurrentIrql () == APC_LEVEL);
MmUnlockPagableImageSection(ExPageLockHandle);
MiZeroingDisabled = FALSE;
MiMirroringActive = FALSE;
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}
ASSERT ((KeGetCurrentIrql () == APC_LEVEL) ||
(KeGetCurrentIrql () == DISPATCH_LEVEL));
//
// Phase0 copying is now complete.
//
// BitMap2 contains the list of safely transmitted (bit == 0) and
// pages needing transmission (bit == 1).
//
// BitMap content is obsolete and if mirror verification is enabled,
// BitMap will be reused below to accumulate the pages needing
// verification in the following steps.
//
// Prepare for Phase1:
//
// 1. Assume all pages are to be verified (set all bits in BitMap).
// 2. Synchronize list updates by acquiring the PFN lock.
// 3. Exclude all holes in the PFN database.
//
// Phase 1:
//
// 4. Copy all the remaining pages whose bits are set.
// 5. Transmit the list of pages to be verified if so configured.
//
BitMapBytes = (ULONG)((((MiMirrorBitMap->SizeOfBitMap) + 31) / 32) * 4);
BitMap1 = MiMirrorBitMap->Buffer;
BitMap2 = MiMirrorBitMap2->Buffer;
BitMapSize = MiMirrorBitMap->SizeOfBitMap;
ASSERT (BitMapSize == MiMirrorBitMap2->SizeOfBitMap);
//
// Step 1: Assume all pages are to be verified (set all bits in BitMap).
//
if (MmMirroring & MM_MIRRORING_VERIFYING) {
RtlSetAllBits(MiMirrorBitMap);
}
//
// Step 2: Synchronize list updates by acquiring the PFN lock.
//
LOCK_PFN2 (OldIrql);
//
// No more updates of the bitmaps are needed - we've already snapped the
// information we need and are going to hold the PFN lock from here until
// we're done.
//
MiMirroringActive = FALSE;
//
// Step 3: Exclude any memory gaps.
//
Limit = 0;
PreviousPage = 0;
do {
ThisPage = MmPhysicalMemoryBlock->Run[Limit].BasePage;
if (ThisPage != PreviousPage) {
RtlClearBits (MiMirrorBitMap2,
(ULONG)PreviousPage,
(ULONG)(ThisPage - PreviousPage));
if (MmMirroring & MM_MIRRORING_VERIFYING) {
RtlClearBits (MiMirrorBitMap,
(ULONG)PreviousPage,
(ULONG)(ThisPage - PreviousPage));
}
}
PreviousPage = ThisPage + MmPhysicalMemoryBlock->Run[Limit].PageCount;
Limit += 1;
} while (Limit != MmPhysicalMemoryBlock->NumberOfRuns);
if (PreviousPage != MmHighestPossiblePhysicalPage + 1) {
RtlClearBits (MiMirrorBitMap2,
(ULONG)PreviousPage,
(ULONG)(MmHighestPossiblePhysicalPage + 1 - PreviousPage));
if (MmMirroring & MM_MIRRORING_VERIFYING) {
RtlClearBits (MiMirrorBitMap,
(ULONG)PreviousPage,
(ULONG)(MmHighestPossiblePhysicalPage + 1 - PreviousPage));
}
}
//
// Step 4: Initiate Phase1 copying.
//
// N.B. If this code or code that it calls, writes to non-stack
// memory between this point and the completion of the call to
// HalEndMirroring(1), the mirror *BREAKS*, because MmCreateMirror
// does not know when that non-stack data will be transferred to
// the new memory. [This rule can be broken if special arrangements
// are made to re-copy the memory after the final write takes place.]
//
// N.B. The HAL *MUST* handle the writes into this routine's stack
// frame at the same time it deals with the stack frame of HalEndMirroring
// and any other frames pushed by the HAL.
//
BitMapHint = 0;
#if DBG
PagesWritten = 0;
PassMaxRun = 0;
#endif
do {
BitMapIndex = RtlFindSetBits (MiMirrorBitMap2, 1, BitMapHint);
if (BitMapIndex < BitMapHint) {
break;
}
if (BitMapIndex == NO_BITS_FOUND) {
break;
}
//
// Found at least one page to copy - try for a cluster.
//
LengthOfClearRun = RtlFindNextForwardRunClear (MiMirrorBitMap2,
BitMapIndex,
&StartingRunIndex);
if (LengthOfClearRun != 0) {
LengthOfSetRun = StartingRunIndex - BitMapIndex;
}
else {
LengthOfSetRun = MiMirrorBitMap2->SizeOfBitMap - BitMapIndex;
}
#if DBG
PagesWritten += LengthOfSetRun;
if (LengthOfSetRun > PassMaxRun) {
PassMaxRun = LengthOfSetRun;
}
#endif
//
// Write out the page(s).
//
PhysicalAddress.QuadPart = BitMapIndex;
PhysicalAddress.QuadPart = PhysicalAddress.QuadPart << PAGE_SHIFT;
PhysicalBytes.QuadPart = LengthOfSetRun;
PhysicalBytes.QuadPart = PhysicalBytes.QuadPart << PAGE_SHIFT;
Status = HalMirrorPhysicalMemory (PhysicalAddress, PhysicalBytes);
if (!NT_SUCCESS(Status)) {
UNLOCK_PFN2 (ExitIrql);
MiZeroingDisabled = FALSE;
MmUnlockPagableImageSection(ExPageLockHandle);
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}
BitMapHint = BitMapIndex + LengthOfSetRun + LengthOfClearRun;
} while (BitMapHint < MiMirrorBitMap2->SizeOfBitMap);
//
// Phase1 copying is now complete.
//
//
// Step 5:
//
// If HAL verification is enabled, inform the HAL of the ranges the
// systems expects were mirrored. Any range not in this list means
// that the system doesn't care if it was mirrored and the contents may
// very well be different between the mirrors. Note the PFN lock is still
// held so that the HAL can see things consistently.
//
#if DBG
PagesVerified = 0;
#endif
if (MmMirroring & MM_MIRRORING_VERIFYING) {
BitMapHint = 0;
do {
BitMapIndex = RtlFindSetBits (MiMirrorBitMap, 1, BitMapHint);
if (BitMapIndex < BitMapHint) {
break;
}
if (BitMapIndex == NO_BITS_FOUND) {
break;
}
//
// Found at least one page in this mirror range - try for a cluster.
//
LengthOfClearRun = RtlFindNextForwardRunClear (MiMirrorBitMap,
BitMapIndex,
&StartingRunIndex);
if (LengthOfClearRun != 0) {
LengthOfSetRun = StartingRunIndex - BitMapIndex;
}
else {
LengthOfSetRun = MiMirrorBitMap->SizeOfBitMap - BitMapIndex;
}
#if DBG
PagesVerified += LengthOfSetRun;
#endif
//
// Tell the HAL that this range must be in a mirrored state.
//
PhysicalAddress.QuadPart = BitMapIndex;
PhysicalAddress.QuadPart = PhysicalAddress.QuadPart << PAGE_SHIFT;
PhysicalBytes.QuadPart = LengthOfSetRun;
PhysicalBytes.QuadPart = PhysicalBytes.QuadPart << PAGE_SHIFT;
Status = HalMirrorVerify (PhysicalAddress, PhysicalBytes);
if (!NT_SUCCESS(Status)) {
UNLOCK_PFN2 (ExitIrql);
MiZeroingDisabled = FALSE;
MmUnlockPagableImageSection(ExPageLockHandle);
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}
BitMapHint = BitMapIndex + LengthOfSetRun + LengthOfClearRun;
} while (BitMapHint < MiMirrorBitMap->SizeOfBitMap);
}
//
// Phase1 verification is now complete.
//
//
// Notify the HAL that everything's done while still holding
// the PFN lock - the HAL will now complete copying of all pages and
// any other needed state before returning from this call.
//
Status = HalEndMirroring (1);
UNLOCK_PFN2 (ExitIrql);
#if DBG
if (MiMirrorDebug != 0) {
DbgPrint ("Mirror P1: %x pages copied\n", PagesWritten);
if (MmMirroring & MM_MIRRORING_VERIFYING) {
DbgPrint ("Mirror P1: %x pages verified\n", PagesVerified);
}
}
if (PassMaxRun > MiMirrorPassMax[1]) {
MiMirrorPassMax[1] = PassMaxRun;
}
#endif
MiZeroingDisabled = FALSE;
MmUnlockPagableImageSection(ExPageLockHandle);
ExReleaseFastMutex (&MmDynamicMemoryMutex);
return Status;
}