8 Apr
2021
8 Apr
'21
1:40 p.m.
https://git.reactos.org/?p=reactos.git;a=commitdiff;h=36a92e6ea5823ce684dfb…
commit 36a92e6ea5823ce684dfb1886494bebc918ff6ae
Author: Jérôme Gardou <jerome.gardou(a)reactos.org>
AuthorDate: Fri Feb 5 15:04:07 2021 +0100
Commit: Jérôme Gardou <zefklop(a)users.noreply.github.com>
CommitDate: Thu Apr 8 15:40:37 2021 +0200
[NTOS:MM] Fix a bit the page-out/page-in logic
- Do not lock the section segment when we are serving a fault for a process private
page.
- Do not keep the process address space lock while writing to pagefile.
- Do not wait for an event that might never be set.
---
ntoskrnl/cache/section/newmm.h | 10 ----
ntoskrnl/include/internal/mm.h | 3 +-
ntoskrnl/mm/i386/page.c | 27 ++--------
ntoskrnl/mm/mmfault.c | 5 +-
ntoskrnl/mm/rmap.c | 47 +++++++++++------
ntoskrnl/mm/section.c | 111 ++++++++++++++++++-----------------------
6 files changed, 88 insertions(+), 115 deletions(-)
diff --git a/ntoskrnl/cache/section/newmm.h b/ntoskrnl/cache/section/newmm.h
index 2efcd9cf7d5..cf40d688edf 100644
--- a/ntoskrnl/cache/section/newmm.h
+++ b/ntoskrnl/cache/section/newmm.h
@@ -17,16 +17,6 @@
#define SEC_CACHE (0x20000000)
-#define MiWaitForPageEvent(Process,Address) do { \
- DPRINT("MiWaitForPageEvent %p:%p #\n", Process, Address); \
- KeWaitForSingleObject(&MmWaitPageEvent, 0, KernelMode, FALSE, NULL); \
-} while(0)
-
-#define MiSetPageEvent(Process,Address) do { \
- DPRINT("MiSetPageEvent %p:%p #\n",Process, (PVOID)(Address)); \
- KeSetEvent(&MmWaitPageEvent, IO_NO_INCREMENT, FALSE); \
-} while(0)
-
/* We store 8 bits of location with a page association */
#define ENTRIES_PER_ELEMENT 256
diff --git a/ntoskrnl/include/internal/mm.h b/ntoskrnl/include/internal/mm.h
index 074dbd4e454..d05360c28be 100644
--- a/ntoskrnl/include/internal/mm.h
+++ b/ntoskrnl/include/internal/mm.h
@@ -1376,7 +1376,8 @@ NTAPI
MmAccessFaultSectionView(
PMMSUPPORT AddressSpace,
MEMORY_AREA* MemoryArea,
- PVOID Address
+ PVOID Address,
+ BOOLEAN Locked
);
VOID
diff --git a/ntoskrnl/mm/i386/page.c b/ntoskrnl/mm/i386/page.c
index b541b5d4752..4690a9a5d15 100644
--- a/ntoskrnl/mm/i386/page.c
+++ b/ntoskrnl/mm/i386/page.c
@@ -219,6 +219,8 @@ MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN
Create, PKIRQ
PMMPDE PdeBase;
ULONG PdeOffset = MiGetPdeOffset(Address);
+ ASSERT(!Create);
+
PdeBase = MiMapPageInHyperSpace(PsGetCurrentProcess(),
PTE_TO_PFN(Process->Pcb.DirectoryTableBase[0]),
OldIrql);
@@ -229,29 +231,8 @@ MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN
Create, PKIRQ
PointerPde = PdeBase + PdeOffset;
if (PointerPde->u.Hard.Valid == 0)
{
- KAPC_STATE ApcState;
- NTSTATUS Status;
-
- if (!Create)
- {
- MiUnmapPageInHyperSpace(PsGetCurrentProcess(), PdeBase, *OldIrql);
- return NULL;
- }
-
- KeStackAttachProcess(&Process->Pcb, &ApcState);
-
- Status = MiDispatchFault(0x1,
- MiAddressToPte(Address),
- MiAddressToPde(Address),
- NULL,
- FALSE,
- Process,
- NULL,
- NULL);
-
- KeUnstackDetachProcess(&ApcState);
- if (!NT_SUCCESS(Status))
- return NULL;
+ MiUnmapPageInHyperSpace(PsGetCurrentProcess(), PdeBase, *OldIrql);
+ return NULL;
}
Pfn = PointerPde->u.Hard.PageFrameNumber;
diff --git a/ntoskrnl/mm/mmfault.c b/ntoskrnl/mm/mmfault.c
index 75f7b584a22..410b2f558e8 100644
--- a/ntoskrnl/mm/mmfault.c
+++ b/ntoskrnl/mm/mmfault.c
@@ -77,7 +77,8 @@ MmpAccessFault(KPROCESSOR_MODE Mode,
case MEMORY_AREA_SECTION_VIEW:
Status = MmAccessFaultSectionView(AddressSpace,
MemoryArea,
- (PVOID)Address);
+ (PVOID)Address,
+ !FromMdl);
break;
#ifdef NEWCC
case MEMORY_AREA_CACHE:
@@ -169,7 +170,7 @@ MmNotPresentFault(KPROCESSOR_MODE Mode,
Status = MmNotPresentFaultSectionView(AddressSpace,
MemoryArea,
(PVOID)Address,
- FromMdl);
+ !FromMdl);
break;
#ifdef NEWCC
case MEMORY_AREA_CACHE:
diff --git a/ntoskrnl/mm/rmap.c b/ntoskrnl/mm/rmap.c
index a2169eeb54f..973b8342a5e 100644
--- a/ntoskrnl/mm/rmap.c
+++ b/ntoskrnl/mm/rmap.c
@@ -141,15 +141,13 @@ GetEntry:
/* The segment is being read or something. Give up */
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
- if (Address < MmSystemRangeStart)
- {
- ExReleaseRundownProtection(&Process->RundownProtect);
- ObDereferenceObject(Process);
- }
+ ExReleaseRundownProtection(&Process->RundownProtect);
+ ObDereferenceObject(Process);
return(STATUS_UNSUCCESSFUL);
}
/* Delete this virtual mapping in the process */
+ MmDeleteRmap(Page, Process, Address);
MmDeleteVirtualMapping(Process, Address, &Dirty, &MapPage);
/* We checked this earlier */
@@ -162,6 +160,11 @@ GetEntry:
/* This page is private to the process */
MmUnlockSectionSegment(Segment);
+ /* Attach to it, if needed */
+ ASSERT(PsGetCurrentProcess() == PsInitialSystemProcess);
+ if (Process != PsInitialSystemProcess)
+ KeAttachProcess(&Process->Pcb);
+
/* Check if we should write it back to the page file */
SwapEntry = MmGetSavedSwapEntryPage(Page);
@@ -177,14 +180,14 @@ GetEntry:
/* We can't, so let this page in the Process VM */
MmCreateVirtualMapping(Process, Address, Region->Protect,
&Page, 1);
+ MmInsertRmap(Page, Process, Address);
MmSetDirtyPage(Process, Address);
MmUnlockAddressSpace(AddressSpace);
- if (Address < MmSystemRangeStart)
- {
- ExReleaseRundownProtection(&Process->RundownProtect);
- ObDereferenceObject(Process);
- }
+ if (Process != PsInitialSystemProcess)
+ KeDetachProcess();
+ ExReleaseRundownProtection(&Process->RundownProtect);
+ ObDereferenceObject(Process);
return STATUS_UNSUCCESSFUL;
}
@@ -192,7 +195,18 @@ GetEntry:
if (Dirty)
{
+ SWAPENTRY Dummy;
+
+ /* Put a wait entry into the process and unlock */
+ MmCreatePageFileMapping(Process, Address, MM_WAIT_ENTRY);
+ MmUnlockAddressSpace(AddressSpace);
+
Status = MmWriteToSwapPage(SwapEntry, Page);
+
+ MmLockAddressSpace(AddressSpace);
+ MmDeletePageFileMapping(Process, Address, &Dummy);
+ ASSERT(Dummy == MM_WAIT_ENTRY);
+
if (!NT_SUCCESS(Status))
{
/* We failed at saving the content of this page. Keep it in */
@@ -206,9 +220,12 @@ GetEntry:
/* We can't, so let this page in the Process VM */
MmCreateVirtualMapping(Process, Address, Region->Protect,
&Page, 1);
+ MmInsertRmap(Page, Process, Address);
MmSetDirtyPage(Process, Address);
MmUnlockAddressSpace(AddressSpace);
+ if (Process != PsInitialSystemProcess)
+ KeDetachProcess();
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
@@ -223,10 +240,11 @@ GetEntry:
MmSetSavedSwapEntryPage(Page, 0);
}
- MmUnlockAddressSpace(AddressSpace);
-
/* We can finally let this page go */
- MmDeleteRmap(Page, Process, Address);
+
+ MmUnlockAddressSpace(AddressSpace);
+ if (Process != PsInitialSystemProcess)
+ KeDetachProcess();
#if DBG
OldIrql = MiAcquirePfnLock();
ASSERT(MmGetRmapListHeadPage(Page) == NULL);
@@ -240,9 +258,6 @@ GetEntry:
return STATUS_SUCCESS;
}
- /* Delete this RMAP */
- MmDeleteRmap(Page, Process, Address);
-
/* One less mapping referencing this segment */
Released = MmUnsharePageEntrySectionSegment(MemoryArea, Segment, &Offset,
Dirty, TRUE, NULL);
diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c
index 3ff8098937d..88392afee7d 100644
--- a/ntoskrnl/mm/section.c
+++ b/ntoskrnl/mm/section.c
@@ -1461,7 +1461,11 @@ MmAlterViewAttributes(PMMSUPPORT AddressSpace,
MmGetPageFileMapping(Process, Address, &SwapEntry);
if (SwapEntry != MM_WAIT_ENTRY)
break;
- MiWaitForPageEvent(Process, Address);
+ MmUnlockSectionSegment(Segment);
+ MmUnlockAddressSpace(AddressSpace);
+ YieldProcessor();
+ MmLockAddressSpace(AddressSpace);
+ MmLockSectionSegment(Segment);
}
while (TRUE);
@@ -1522,6 +1526,8 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
SWAPENTRY SwapEntry;
+ ASSERT(Locked);
+
/*
* There is a window between taking the page fault and locking the
* address space when another thread could load the page so we check
@@ -1577,39 +1583,6 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
return STATUS_GUARD_PAGE_VIOLATION;
}
- /*
- * Lock the segment
- */
- MmLockSectionSegment(Segment);
- Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
- /*
- * Check if this page needs to be mapped COW
- */
- if ((Segment->WriteCopy) &&
- (Region->Protect == PAGE_READWRITE ||
- Region->Protect == PAGE_EXECUTE_READWRITE))
- {
- Attributes = Region->Protect == PAGE_READWRITE ? PAGE_READONLY :
PAGE_EXECUTE_READ;
- }
- else
- {
- Attributes = Region->Protect;
- }
-
- /*
- * Check if someone else is already handling this fault, if so wait
- * for them
- */
- if (Entry && MM_IS_WAIT_PTE(Entry))
- {
- MmUnlockSectionSegment(Segment);
- MmUnlockAddressSpace(AddressSpace);
- MiWaitForPageEvent(NULL, NULL);
- MmLockAddressSpace(AddressSpace);
- DPRINT("Address 0x%p\n", Address);
- return STATUS_MM_RESTART_OPERATION;
- }
-
HasSwapEntry = MmIsPageSwapEntry(Process, Address);
/* See if we should use a private page */
@@ -1620,22 +1593,21 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
MmGetPageFileMapping(Process, Address, &SwapEntry);
if (SwapEntry == MM_WAIT_ENTRY)
{
- MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
- MiWaitForPageEvent(NULL, NULL);
+ YieldProcessor();
MmLockAddressSpace(AddressSpace);
return STATUS_MM_RESTART_OPERATION;
}
/*
- * Must be private page we have swapped out.
- */
+ * Must be private page we have swapped out.
+ */
/*
* Sanity check
*/
- MmDeletePageFileMapping(Process, Address, &SwapEntry);
- MmUnlockSectionSegment(Segment);
+ MmDeletePageFileMapping(Process, Address, &DummyEntry);
+ ASSERT(DummyEntry == SwapEntry);
/* Tell everyone else we are serving the fault. */
MmCreatePageFileMapping(Process, Address, MM_WAIT_ENTRY);
@@ -1650,18 +1622,17 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
KeBugCheck(MEMORY_MANAGEMENT);
}
- if (HasSwapEntry)
+ Status = MmReadFromSwapPage(SwapEntry, Page);
+ if (!NT_SUCCESS(Status))
{
- Status = MmReadFromSwapPage(SwapEntry, Page);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("MmReadFromSwapPage failed, status = %x\n", Status);
- KeBugCheck(MEMORY_MANAGEMENT);
- }
+ DPRINT1("MmReadFromSwapPage failed, status = %x\n", Status);
+ KeBugCheck(MEMORY_MANAGEMENT);
}
MmLockAddressSpace(AddressSpace);
MmDeletePageFileMapping(Process, PAddress, &DummyEntry);
+ ASSERT(DummyEntry == MM_WAIT_ENTRY);
+
Status = MmCreateVirtualMapping(Process,
PAddress,
Region->Protect,
@@ -1677,8 +1648,7 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
/*
* Store the swap entry for later use.
*/
- if (HasSwapEntry)
- MmSetSavedSwapEntryPage(Page, SwapEntry);
+ MmSetSavedSwapEntryPage(Page, SwapEntry);
/*
* Add the page to the process's working set
@@ -1687,11 +1657,15 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
/*
* Finish the operation
*/
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
+ /*
+ * Lock the segment
+ */
+ MmLockSectionSegment(Segment);
+
/*
* Satisfying a page fault on a map of /Device/PhysicalMemory is easy
*/
@@ -1717,16 +1691,29 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
/*
* Cleanup and release locks
*/
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
+ /*
+ * Check if this page needs to be mapped COW
+ */
+ if ((Segment->WriteCopy) &&
+ (Region->Protect == PAGE_READWRITE ||
+ Region->Protect == PAGE_EXECUTE_READWRITE))
+ {
+ Attributes = Region->Protect == PAGE_READWRITE ? PAGE_READONLY :
PAGE_EXECUTE_READ;
+ }
+ else
+ {
+ Attributes = Region->Protect;
+ }
+
+
/*
* Get the entry corresponding to the offset within the section
*/
Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
-
if (Entry == 0)
{
/*
@@ -1752,7 +1739,6 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
if (Process)
MmInsertRmap(Page, Process, Address);
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
@@ -1792,7 +1778,7 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
{
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
- MiWaitForPageEvent(NULL, NULL);
+ YieldProcessor();
MmLockAddressSpace(AddressSpace);
return STATUS_MM_RESTART_OPERATION;
}
@@ -1800,6 +1786,7 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
/*
* Release all our locks and read in the page from disk
*/
+ MmSetPageEntrySectionSegment(Segment, &Offset,
MAKE_SWAP_SSE(MM_WAIT_ENTRY));
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
@@ -1826,7 +1813,7 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
* that has a pending page-in.
*/
Entry1 = MmGetPageEntrySectionSegment(Segment, &Offset);
- if (Entry != Entry1)
+ if (Entry1 != MAKE_SWAP_SSE(MM_WAIT_ENTRY))
{
DPRINT1("Someone changed ppte entry while we slept (%x vs %x)\n",
Entry, Entry1);
KeBugCheck(MEMORY_MANAGEMENT);
@@ -1859,7 +1846,6 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
MmSetPageEntrySectionSegment(Segment, &Offset, Entry);
MmUnlockSectionSegment(Segment);
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
@@ -1886,7 +1872,6 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
MmSharePageEntrySectionSegment(Segment, &Offset);
MmUnlockSectionSegment(Segment);
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
@@ -1896,7 +1881,8 @@ NTSTATUS
NTAPI
MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
MEMORY_AREA* MemoryArea,
- PVOID Address)
+ PVOID Address,
+ BOOLEAN Locked)
{
PMM_SECTION_SEGMENT Segment;
PFN_NUMBER OldPage;
@@ -1911,7 +1897,7 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
DPRINT("MmAccessFaultSectionView(%p, %p, %p)\n", AddressSpace, MemoryArea,
Address);
/* Make sure we have a page mapping for this address. */
- Status = MmNotPresentFaultSectionView(AddressSpace, MemoryArea, Address, TRUE);
+ Status = MmNotPresentFaultSectionView(AddressSpace, MemoryArea, Address, Locked);
if (!NT_SUCCESS(Status))
{
/* This is invalid access ! */
@@ -2011,7 +1997,6 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
if (Process)
MmInsertRmap(NewPage, Process, PAddress);
- MiSetPageEvent(Process, Address);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
@@ -3383,7 +3368,7 @@ MmFreeSectionPage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID
Address,
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
- MiWaitForPageEvent(NULL, NULL);
+ YieldProcessor();
MmLockAddressSpace(AddressSpace);
MmLockSectionSegment(Segment);
@@ -4600,7 +4585,7 @@ MmRosFlushVirtualMemory(
while (MM_IS_WAIT_PTE(Entry))
{
MmUnlockSectionSegment(Segment);
- MiWaitForPageEvent(NULL, NULL);
+ YieldProcessor();
MmLockSectionSegment(Segment);
Entry = MmGetPageEntrySectionSegment(Segment, &SegmentOffset);
}
@@ -5010,7 +4995,7 @@ MmMakePagesDirty(
{
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
- MiWaitForPageEvent(NULL, NULL);
+ YieldProcessor();
MmLockAddressSpace(AddressSpace);
MmLockSectionSegment(Segment);
Entry = MmGetPageEntrySectionSegment(Segment, &SegmentOffset);
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Jérôme Gardou