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660 lines
20 KiB
C
660 lines
20 KiB
C
/*
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* Copyright (C) 1998-2005 ReactOS Team (and the authors from the programmers section)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/cache/section/swapout.c
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* PURPOSE: Consolidate fault handlers for sections
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*
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* PROGRAMMERS: Arty
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* Rex Jolliff
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* David Welch
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* Eric Kohl
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* Emanuele Aliberti
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* Eugene Ingerman
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* Casper Hornstrup
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* KJK::Hyperion
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* Guido de Jong
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* Ge van Geldorp
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* Royce Mitchell III
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* Filip Navara
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* Aleksey Bragin
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* Jason Filby
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* Thomas Weidenmueller
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* Gunnar Andre' Dalsnes
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* Mike Nordell
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* Alex Ionescu
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* Gregor Anich
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* Steven Edwards
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* Herve Poussineau
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*/
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/*
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This file implements page out infrastructure for cache type sections. This
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is implemented a little differently from the legacy mm because mapping in an
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address space and membership in a segment are considered separate.
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The general strategy here is to try to remove all mappings as gently as
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possible, then to remove the page entry from the section itself as a final
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step. If at any time during the page out operation, the page is mapped in
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a new address space by a competing thread, the operation will abort before
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the segment page is finally removed, and the page will be naturally faulted
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back into any address spaces required in the normal way.
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*/
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/* INCLUDES *****************************************************************/
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#include <ntoskrnl.h>
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#include "newmm.h"
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#define NDEBUG
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#include <debug.h>
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#define DPRINTC DPRINT
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extern KEVENT MmWaitPageEvent;
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extern FAST_MUTEX RmapListLock;
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extern PMMWSL MmWorkingSetList;
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FAST_MUTEX MiGlobalPageOperation;
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/*
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MmWithdrawSectionPage removes a page entry from the section segment, replacing
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it with a wait entry. The caller must replace the wait entry with a 0, when
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any required writing is done. The wait entry must remain until the page is
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written to protect against cases where a fault brings a stale copy of the page
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back before writing is complete.
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*/
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PFN_NUMBER
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NTAPI
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MmWithdrawSectionPage(PMM_SECTION_SEGMENT Segment,
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PLARGE_INTEGER FileOffset,
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BOOLEAN *Dirty)
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{
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ULONG_PTR Entry;
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DPRINT("MmWithdrawSectionPage(%p,%08x%08x,%p)\n",
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Segment,
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FileOffset->HighPart,
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FileOffset->LowPart,
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Dirty);
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MmLockSectionSegment(Segment);
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Entry = MmGetPageEntrySectionSegment(Segment, FileOffset);
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*Dirty = !!IS_DIRTY_SSE(Entry);
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DPRINT("Withdraw %x (%x) of %wZ\n",
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FileOffset->LowPart,
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Entry,
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Segment->FileObject ? &Segment->FileObject->FileName : NULL);
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if (!Entry)
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{
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DPRINT("Stoeled!\n");
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MmUnlockSectionSegment(Segment);
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return 0;
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}
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else if (MM_IS_WAIT_PTE(Entry))
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{
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DPRINT("WAIT\n");
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MmUnlockSectionSegment(Segment);
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return MM_WAIT_ENTRY;
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}
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else if (Entry && !IS_SWAP_FROM_SSE(Entry))
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{
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DPRINT("Page %x\n", PFN_FROM_SSE(Entry));
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*Dirty |= (Entry & 2);
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MmSetPageEntrySectionSegment(Segment,
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FileOffset,
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MAKE_SWAP_SSE(MM_WAIT_ENTRY));
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MmUnlockSectionSegment(Segment);
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return PFN_FROM_SSE(Entry);
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}
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else
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{
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DPRINT1("SWAP ENTRY?! (%p:%08x%08x)\n",
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Segment,
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FileOffset->HighPart,
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FileOffset->LowPart);
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ASSERT(FALSE);
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MmUnlockSectionSegment(Segment);
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return 0;
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}
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}
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/*
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This function determines whether the segment holds the very last reference to
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the page being considered and if so, writes it back or discards it as
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approriate. One small niggle here is that we might be holding the last
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reference to the section segment associated with this page. That happens
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when the segment is destroyed at the same time that an active swap operation
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is occurring, and all maps were already withdrawn. In that case, it's our
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responsiblity for finalizing the segment.
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Note that in the current code, WriteZero is always TRUE because the section
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always backs a file. In the ultimate form of this code, it also writes back
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pages without necessarily evicting them. In reactos' trunk, this is vestigal.
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*/
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NTSTATUS
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NTAPI
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MmFinalizeSectionPageOut(PMM_SECTION_SEGMENT Segment,
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PLARGE_INTEGER FileOffset,
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PFN_NUMBER Page,
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BOOLEAN Dirty)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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BOOLEAN WriteZero = FALSE, WritePage = FALSE;
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SWAPENTRY Swap = MmGetSavedSwapEntryPage(Page);
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/* Bail early if the reference count isn't where we need it */
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if (MmGetReferenceCountPage(Page) != 1)
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{
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DPRINT1("Cannot page out locked page %x with ref count %lu\n",
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Page,
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MmGetReferenceCountPage(Page));
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return STATUS_UNSUCCESSFUL;
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}
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MmLockSectionSegment(Segment);
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(void)InterlockedIncrementUL(&Segment->ReferenceCount);
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if (Dirty)
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{
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DPRINT("Finalize (dirty) Segment %p Page %x\n", Segment, Page);
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DPRINT("Segment->FileObject %p\n", Segment->FileObject);
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DPRINT("Segment->Flags %x\n", Segment->Flags);
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WriteZero = TRUE;
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WritePage = TRUE;
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}
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else
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{
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WriteZero = TRUE;
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}
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DPRINT("Status %x\n", Status);
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MmUnlockSectionSegment(Segment);
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if (WritePage)
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{
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DPRINT("MiWriteBackPage(Segment %p FileObject %p Offset %x)\n",
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Segment,
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Segment->FileObject,
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FileOffset->LowPart);
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Status = MiWriteBackPage(Segment->FileObject,
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FileOffset,
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PAGE_SIZE,
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Page);
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}
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MmLockSectionSegment(Segment);
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if (WriteZero && NT_SUCCESS(Status))
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{
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DPRINT("Setting page entry in segment %p:%x to swap %x\n",
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Segment,
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FileOffset->LowPart,
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Swap);
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MmSetPageEntrySectionSegment(Segment,
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FileOffset,
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Swap ? MAKE_SWAP_SSE(Swap) : 0);
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}
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else
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{
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DPRINT("Setting page entry in segment %p:%x to page %x\n",
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Segment,
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FileOffset->LowPart,
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Page);
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MmSetPageEntrySectionSegment(Segment,
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FileOffset,
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Page ? (Dirty ? DIRTY_SSE(MAKE_PFN_SSE(Page)) : MAKE_PFN_SSE(Page)) : 0);
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}
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if (NT_SUCCESS(Status))
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{
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DPRINT("Removing page %x for real\n", Page);
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MmSetSavedSwapEntryPage(Page, 0);
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MmReleasePageMemoryConsumer(MC_CACHE, Page);
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}
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MmUnlockSectionSegment(Segment);
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if (InterlockedDecrementUL(&Segment->ReferenceCount) == 0)
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{
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MmFinalizeSegment(Segment);
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}
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/* Note: Writing may evict the segment... Nothing is guaranteed from here down */
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MiSetPageEvent(Segment, (ULONG_PTR)FileOffset->QuadPart);
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DPRINT("Status %x\n", Status);
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return Status;
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}
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/*
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The slightly misnamed MmPageOutCacheSection removes a page from an address
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space in the manner of fault handlers found in fault.c. In the ultimate form
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of the code, this is one of the function pointers stored in a memory area
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to control how pages in that memory area are managed.
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Also misleading is the call to MmReleasePageMemoryConsumer, which releases
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the reference held by this address space only. After all address spaces
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have had MmPageOutCacheSection succeed on them for the indicated page,
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then paging out of a cache page can continue.
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*/
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NTSTATUS
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NTAPI
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MmPageOutCacheSection(PMMSUPPORT AddressSpace,
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MEMORY_AREA* MemoryArea,
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PVOID Address,
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PBOOLEAN Dirty,
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PMM_REQUIRED_RESOURCES Required)
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{
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ULONG_PTR Entry;
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PFN_NUMBER OurPage;
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PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
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LARGE_INTEGER TotalOffset;
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PMM_SECTION_SEGMENT Segment;
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PVOID PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
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TotalOffset.QuadPart = (ULONG_PTR)PAddress -
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MA_GetStartingAddress(MemoryArea) +
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MemoryArea->Data.SectionData.ViewOffset.QuadPart;
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Segment = MemoryArea->Data.SectionData.Segment;
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MmLockSectionSegment(Segment);
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ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
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Entry = MmGetPageEntrySectionSegment(Segment, &TotalOffset);
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DBG_UNREFERENCED_LOCAL_VARIABLE(Entry);
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if (MmIsPageSwapEntry(Process, PAddress))
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{
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SWAPENTRY SwapEntry;
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MmGetPageFileMapping(Process, PAddress, &SwapEntry);
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MmUnlockSectionSegment(Segment);
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return SwapEntry == MM_WAIT_ENTRY ? STATUS_SUCCESS + 1 : STATUS_UNSUCCESSFUL;
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}
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MmDeleteRmap(Required->Page[0], Process, Address);
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MmDeleteVirtualMapping(Process, Address, Dirty, &OurPage);
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ASSERT(OurPage == Required->Page[0]);
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/* Note: this releases the reference held by this address space only. */
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MmReleasePageMemoryConsumer(MC_CACHE, Required->Page[0]);
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MmUnlockSectionSegment(Segment);
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MiSetPageEvent(Process, Address);
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return STATUS_SUCCESS;
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}
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/*
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This function is called by rmap when spare pages are needed by the blancer.
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It attempts first to release the page from every address space in which it
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appears, and, after a final check that no competing thread has mapped the
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page again, uses MmFinalizeSectionPageOut to completely evict the page. If
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that's successful, then a suitable non-page map will be left in the segment
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page table, otherwise, the original page is replaced in the section page
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map. Failure may result from a variety of conditions, but always leaves
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the page mapped.
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This code is like the other fault handlers, in that MmPageOutCacheSection has
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the option of returning either STATUS_SUCCESS + 1 to wait for a wait entry
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to disppear or to use the blocking callout facility by returning
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STATUS_MORE_PROCESSING_REQUIRED and placing a pointer to a function from
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reqtools.c in the MM_REQUIRED_RESOURCES struct.
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*/
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NTSTATUS
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NTAPI
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MmpPageOutPhysicalAddress(PFN_NUMBER Page)
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{
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BOOLEAN ProcRef = FALSE, PageDirty;
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PFN_NUMBER SectionPage = 0;
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PMM_RMAP_ENTRY entry;
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PMM_SECTION_SEGMENT Segment = NULL;
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LARGE_INTEGER FileOffset;
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PMEMORY_AREA MemoryArea;
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PMMSUPPORT AddressSpace = NULL;
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BOOLEAN Dirty = FALSE;
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PVOID Address = NULL;
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PEPROCESS Process = NULL;
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NTSTATUS Status = STATUS_SUCCESS;
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MM_REQUIRED_RESOURCES Resources = { 0 };
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DPRINTC("Page out %x (ref ct %x)\n", Page, MmGetReferenceCountPage(Page));
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ExAcquireFastMutex(&MiGlobalPageOperation);
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if ((Segment = MmGetSectionAssociation(Page, &FileOffset)))
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{
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DPRINTC("Withdrawing page (%x) %p:%x\n",
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Page,
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Segment,
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FileOffset.LowPart);
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SectionPage = MmWithdrawSectionPage(Segment, &FileOffset, &Dirty);
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DPRINTC("SectionPage %x\n", SectionPage);
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if (SectionPage == MM_WAIT_ENTRY || SectionPage == 0)
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{
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DPRINT1("In progress page out %x\n", SectionPage);
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ExReleaseFastMutex(&MiGlobalPageOperation);
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return STATUS_UNSUCCESSFUL;
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}
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else
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{
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ASSERT(SectionPage == Page);
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}
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Resources.State = Dirty ? 1 : 0;
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}
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else
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{
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DPRINT("No segment association for %x\n", Page);
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}
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Dirty = MmIsDirtyPageRmap(Page);
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DPRINTC("Trying to unmap all instances of %x\n", Page);
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ExAcquireFastMutex(&RmapListLock);
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entry = MmGetRmapListHeadPage(Page);
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// Entry and Segment might be null here in the case that the page
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// is new and is in the process of being swapped in
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if (!entry && !Segment)
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{
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Status = STATUS_UNSUCCESSFUL;
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DPRINT1("Page %x is in transit\n", Page);
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ExReleaseFastMutex(&RmapListLock);
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goto bail;
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}
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while (entry != NULL && NT_SUCCESS(Status))
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{
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Process = entry->Process;
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Address = entry->Address;
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DPRINTC("Process %p Address %p Page %x\n", Process, Address, Page);
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if (RMAP_IS_SEGMENT(Address))
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{
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entry = entry->Next;
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continue;
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}
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if (Process && Address < MmSystemRangeStart)
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{
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/* Make sure we don't try to page out part of an exiting process */
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if (PspIsProcessExiting(Process))
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{
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DPRINT("bail\n");
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ExReleaseFastMutex(&RmapListLock);
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goto bail;
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}
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ObReferenceObject(Process);
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ProcRef = TRUE;
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AddressSpace = &Process->Vm;
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}
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else
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{
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AddressSpace = MmGetKernelAddressSpace();
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}
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ExReleaseFastMutex(&RmapListLock);
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RtlZeroMemory(&Resources, sizeof(Resources));
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if ((((ULONG_PTR)Address) & 0xFFF) != 0)
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{
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KeBugCheck(MEMORY_MANAGEMENT);
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}
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do
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{
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MmLockAddressSpace(AddressSpace);
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MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, Address);
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if (MemoryArea == NULL || MemoryArea->DeleteInProgress)
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{
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Status = STATUS_UNSUCCESSFUL;
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MmUnlockAddressSpace(AddressSpace);
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DPRINTC("bail\n");
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goto bail;
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}
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DPRINTC("Type %x (%p -> %p)\n",
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MemoryArea->Type,
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MA_GetStartingAddress(MemoryArea),
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MA_GetEndingAddress(MemoryArea));
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Resources.DoAcquisition = NULL;
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Resources.Page[0] = Page;
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ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
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DPRINT("%p:%p, page %x %x\n",
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Process,
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Address,
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Page,
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Resources.Page[0]);
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PageDirty = FALSE;
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Status = MmPageOutCacheSection(AddressSpace,
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MemoryArea,
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Address,
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&PageDirty,
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&Resources);
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Dirty |= PageDirty;
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DPRINT("%x\n", Status);
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ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
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MmUnlockAddressSpace(AddressSpace);
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if (Status == STATUS_SUCCESS + 1)
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{
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// Wait page ... the other guy has it, so we'll just fail for now
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DPRINT1("Wait entry ... can't continue\n");
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Status = STATUS_UNSUCCESSFUL;
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goto bail;
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}
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else if (Status == STATUS_MORE_PROCESSING_REQUIRED)
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{
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DPRINTC("DoAcquisition %p\n", Resources.DoAcquisition);
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Status = Resources.DoAcquisition(AddressSpace,
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MemoryArea,
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&Resources);
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DPRINTC("Status %x\n", Status);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("bail\n");
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goto bail;
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}
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else
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{
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Status = STATUS_MM_RESTART_OPERATION;
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}
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}
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}
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while (Status == STATUS_MM_RESTART_OPERATION);
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if (ProcRef)
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{
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ObDereferenceObject(Process);
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ProcRef = FALSE;
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}
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ExAcquireFastMutex(&RmapListLock);
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ASSERT(!MM_IS_WAIT_PTE(MmGetPfnForProcess(Process, Address)));
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entry = MmGetRmapListHeadPage(Page);
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DPRINTC("Entry %p\n", entry);
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}
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ExReleaseFastMutex(&RmapListLock);
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bail:
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DPRINTC("BAIL %x\n", Status);
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if (Segment)
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{
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ULONG RefCount;
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|
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DPRINTC("About to finalize section page %x (%p:%x) Status %x %s\n",
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Page,
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Segment,
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FileOffset.LowPart,
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Status,
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Dirty ? "dirty" : "clean");
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if (!NT_SUCCESS(Status) ||
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!NT_SUCCESS(Status = MmFinalizeSectionPageOut(Segment,
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&FileOffset,
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Page,
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Dirty)))
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|
{
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DPRINTC("Failed to page out %x, replacing %x at %x in segment %x\n",
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SectionPage,
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FileOffset.LowPart,
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Segment);
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MmLockSectionSegment(Segment);
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MmSetPageEntrySectionSegment(Segment,
|
|
&FileOffset,
|
|
Dirty ? MAKE_PFN_SSE(Page) : DIRTY_SSE(MAKE_PFN_SSE(Page)));
|
|
|
|
MmUnlockSectionSegment(Segment);
|
|
}
|
|
|
|
/* Alas, we had the last reference */
|
|
if ((RefCount = InterlockedDecrementUL(&Segment->ReferenceCount)) == 0)
|
|
MmFinalizeSegment(Segment);
|
|
}
|
|
|
|
if (ProcRef)
|
|
{
|
|
DPRINTC("Dereferencing process...\n");
|
|
ObDereferenceObject(Process);
|
|
}
|
|
|
|
ExReleaseFastMutex(&MiGlobalPageOperation);
|
|
|
|
DPRINTC("%s %x %x\n",
|
|
NT_SUCCESS(Status) ? "Evicted" : "Spared",
|
|
Page,
|
|
Status);
|
|
|
|
return NT_SUCCESS(Status) ? STATUS_SUCCESS : STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
ULONG
|
|
NTAPI
|
|
MiCacheEvictPages(PMM_SECTION_SEGMENT Segment,
|
|
ULONG Target)
|
|
{
|
|
ULONG_PTR Entry;
|
|
ULONG Result = 0, i, j;
|
|
NTSTATUS Status;
|
|
PFN_NUMBER Page;
|
|
LARGE_INTEGER Offset;
|
|
|
|
MmLockSectionSegment(Segment);
|
|
|
|
for (i = 0; i < RtlNumberGenericTableElements(&Segment->PageTable); i++) {
|
|
|
|
PCACHE_SECTION_PAGE_TABLE Element = RtlGetElementGenericTable(&Segment->PageTable,
|
|
i);
|
|
|
|
ASSERT(Element);
|
|
|
|
Offset = Element->FileOffset;
|
|
for (j = 0; j < ENTRIES_PER_ELEMENT; j++, Offset.QuadPart += PAGE_SIZE) {
|
|
Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
|
|
if (Entry && !IS_SWAP_FROM_SSE(Entry)) {
|
|
Page = PFN_FROM_SSE(Entry);
|
|
MmUnlockSectionSegment(Segment);
|
|
Status = MmpPageOutPhysicalAddress(Page);
|
|
if (NT_SUCCESS(Status))
|
|
Result++;
|
|
MmLockSectionSegment(Segment);
|
|
}
|
|
}
|
|
}
|
|
|
|
MmUnlockSectionSegment(Segment);
|
|
|
|
return Result;
|
|
}
|
|
|
|
extern LIST_ENTRY MiSegmentList;
|
|
|
|
// Interact with legacy balance manager for now
|
|
// This can fall away when our section implementation supports
|
|
// demand paging properly
|
|
NTSTATUS
|
|
MiRosTrimCache(ULONG Target,
|
|
ULONG Priority,
|
|
PULONG NrFreed)
|
|
{
|
|
ULONG Freed;
|
|
PLIST_ENTRY Entry;
|
|
PMM_SECTION_SEGMENT Segment;
|
|
*NrFreed = 0;
|
|
|
|
DPRINT1("Need to trim %lu cache pages\n", Target);
|
|
for (Entry = MiSegmentList.Flink;
|
|
*NrFreed < Target && Entry != &MiSegmentList;
|
|
Entry = Entry->Flink) {
|
|
Segment = CONTAINING_RECORD(Entry, MM_SECTION_SEGMENT, ListOfSegments);
|
|
/* Defer to MM to try recovering pages from it */
|
|
Freed = MiCacheEvictPages(Segment, Target);
|
|
*NrFreed += Freed;
|
|
}
|
|
DPRINT1("Evicted %lu cache pages\n", Target);
|
|
|
|
if (!IsListEmpty(&MiSegmentList)) {
|
|
Entry = MiSegmentList.Flink;
|
|
RemoveEntryList(Entry);
|
|
InsertTailList(&MiSegmentList, Entry);
|
|
}
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|