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reactos/ntoskrnl/mm/balance.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/balance.c
* PURPOSE: kernel memory managment functions
*
* PROGRAMMERS: David Welch (welch@cwcom.net)
* Cameron Gutman (cameron.gutman@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#include "ARM3/miarm.h"
#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, MmInitializeBalancer)
#pragma alloc_text(INIT, MmInitializeMemoryConsumer)
#pragma alloc_text(INIT, MiInitBalancerThread)
#endif
/* TYPES ********************************************************************/
typedef struct _MM_ALLOCATION_REQUEST
{
PFN_NUMBER Page;
LIST_ENTRY ListEntry;
KEVENT Event;
}
MM_ALLOCATION_REQUEST, *PMM_ALLOCATION_REQUEST;
/* GLOBALS ******************************************************************/
MM_MEMORY_CONSUMER MiMemoryConsumers[MC_MAXIMUM];
static ULONG MiMinimumAvailablePages;
static ULONG MiNrTotalPages;
static LIST_ENTRY AllocationListHead;
static KSPIN_LOCK AllocationListLock;
static ULONG MiMinimumPagesPerRun;
static CLIENT_ID MiBalancerThreadId;
static HANDLE MiBalancerThreadHandle = NULL;
static KEVENT MiBalancerEvent;
static KTIMER MiBalancerTimer;
/* FUNCTIONS ****************************************************************/
VOID
INIT_FUNCTION
NTAPI
MmInitializeBalancer(ULONG NrAvailablePages, ULONG NrSystemPages)
{
memset(MiMemoryConsumers, 0, sizeof(MiMemoryConsumers));
InitializeListHead(&AllocationListHead);
KeInitializeSpinLock(&AllocationListLock);
MiNrTotalPages = NrAvailablePages;
/* Set up targets. */
MiMinimumAvailablePages = 256;
MiMinimumPagesPerRun = 256;
if ((NrAvailablePages + NrSystemPages) >= 8192)
{
MiMemoryConsumers[MC_CACHE].PagesTarget = NrAvailablePages / 4 * 3;
}
else if ((NrAvailablePages + NrSystemPages) >= 4096)
{
MiMemoryConsumers[MC_CACHE].PagesTarget = NrAvailablePages / 3 * 2;
}
else
{
MiMemoryConsumers[MC_CACHE].PagesTarget = NrAvailablePages / 8;
}
MiMemoryConsumers[MC_USER].PagesTarget = NrAvailablePages - MiMinimumAvailablePages;
}
VOID
INIT_FUNCTION
NTAPI
MmInitializeMemoryConsumer(
ULONG Consumer,
NTSTATUS (*Trim)(ULONG Target, ULONG Priority, PULONG NrFreed))
{
MiMemoryConsumers[Consumer].Trim = Trim;
}
VOID
NTAPI
MiZeroPhysicalPage(
IN PFN_NUMBER PageFrameIndex
);
NTSTATUS
NTAPI
MmReleasePageMemoryConsumer(ULONG Consumer, PFN_NUMBER Page)
{
if (Page == 0)
{
DPRINT1("Tried to release page zero.\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
if (MmGetReferenceCountPage(Page) == 1)
{
if(Consumer == MC_USER) MmRemoveLRUUserPage(Page);
(void)InterlockedDecrementUL(&MiMemoryConsumers[Consumer].PagesUsed);
}
MmDereferencePage(Page);
return(STATUS_SUCCESS);
}
ULONG
NTAPI
MiTrimMemoryConsumer(ULONG Consumer, ULONG InitialTarget)
{
ULONG Target = InitialTarget;
ULONG NrFreedPages = 0;
NTSTATUS Status;
/* Make sure we can trim this consumer */
if (!MiMemoryConsumers[Consumer].Trim)
{
/* Return the unmodified initial target */
return InitialTarget;
}
if (MiMemoryConsumers[Consumer].PagesUsed > MiMemoryConsumers[Consumer].PagesTarget)
{
/* Consumer page limit exceeded */
Target = max(Target, MiMemoryConsumers[Consumer].PagesUsed - MiMemoryConsumers[Consumer].PagesTarget);
}
if (MmAvailablePages < MiMinimumAvailablePages)
{
/* Global page limit exceeded */
Target = (ULONG)max(Target, MiMinimumAvailablePages - MmAvailablePages);
}
if (Target)
{
if (!InitialTarget)
{
/* If there was no initial target,
* swap at least MiMinimumPagesPerRun */
Target = max(Target, MiMinimumPagesPerRun);
}
/* Now swap the pages out */
Status = MiMemoryConsumers[Consumer].Trim(Target, 0, &NrFreedPages);
DPRINT("Trimming consumer %lu: Freed %lu pages with a target of %lu pages\n", Consumer, NrFreedPages, Target);
if (!NT_SUCCESS(Status))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
/* Update the target */
if (NrFreedPages < Target)
Target -= NrFreedPages;
else
Target = 0;
/* Return the remaining pages needed to meet the target */
return Target;
}
else
{
/* Initial target is zero and we don't have anything else to add */
return 0;
}
}
NTSTATUS
MmTrimUserMemory(ULONG Target, ULONG Priority, PULONG NrFreedPages)
{
PFN_NUMBER CurrentPage;
PFN_NUMBER NextPage;
NTSTATUS Status;
(*NrFreedPages) = 0;
CurrentPage = MmGetLRUFirstUserPage();
while (CurrentPage != 0 && Target > 0)
{
Status = MmPageOutPhysicalAddress(CurrentPage);
if (NT_SUCCESS(Status))
{
DPRINT("Succeeded\n");
Target--;
(*NrFreedPages)++;
}
NextPage = MmGetLRUNextUserPage(CurrentPage);
if (NextPage <= CurrentPage)
{
/* We wrapped around, so we're done */
break;
}
CurrentPage = NextPage;
}
return STATUS_SUCCESS;
}
static BOOLEAN
MiIsBalancerThread(VOID)
{
return (MiBalancerThreadHandle != NULL) &&
(PsGetCurrentThreadId() == MiBalancerThreadId.UniqueThread);
}
VOID
NTAPI
MmRebalanceMemoryConsumers(VOID)
{
if (MiBalancerThreadHandle != NULL &&
!MiIsBalancerThread())
{
KeSetEvent(&MiBalancerEvent, IO_NO_INCREMENT, FALSE);
}
}
NTSTATUS
NTAPI
MmRequestPageMemoryConsumer(ULONG Consumer, BOOLEAN CanWait,
PPFN_NUMBER AllocatedPage)
{
ULONG PagesUsed;
PFN_NUMBER Page;
/*
* Make sure we don't exceed our individual target.
*/
PagesUsed = InterlockedIncrementUL(&MiMemoryConsumers[Consumer].PagesUsed);
if (PagesUsed > MiMemoryConsumers[Consumer].PagesTarget &&
!MiIsBalancerThread())
{
MmRebalanceMemoryConsumers();
}
/*
* Allocate always memory for the non paged pool and for the pager thread.
*/
if ((Consumer == MC_SYSTEM) /* || MiIsBalancerThread() */)
{
Page = MmAllocPage(Consumer);
if (Page == 0)
{
KeBugCheck(NO_PAGES_AVAILABLE);
}
if (Consumer == MC_USER) MmInsertLRULastUserPage(Page);
*AllocatedPage = Page;
if (MmAvailablePages < MiMinimumAvailablePages)
MmRebalanceMemoryConsumers();
return(STATUS_SUCCESS);
}
/*
* Make sure we don't exceed global targets.
*/
if (((MmAvailablePages < MiMinimumAvailablePages) && !MiIsBalancerThread())
|| (MmAvailablePages < (MiMinimumAvailablePages / 2)))
{
MM_ALLOCATION_REQUEST Request;
if (!CanWait)
{
(void)InterlockedDecrementUL(&MiMemoryConsumers[Consumer].PagesUsed);
MmRebalanceMemoryConsumers();
return(STATUS_NO_MEMORY);
}
/* Insert an allocation request. */
Request.Page = 0;
KeInitializeEvent(&Request.Event, NotificationEvent, FALSE);
ExInterlockedInsertTailList(&AllocationListHead, &Request.ListEntry, &AllocationListLock);
MmRebalanceMemoryConsumers();
KeWaitForSingleObject(&Request.Event,
0,
KernelMode,
FALSE,
NULL);
Page = Request.Page;
if (Page == 0)
{
KeBugCheck(NO_PAGES_AVAILABLE);
}
if(Consumer == MC_USER) MmInsertLRULastUserPage(Page);
*AllocatedPage = Page;
if (MmAvailablePages < MiMinimumAvailablePages)
{
MmRebalanceMemoryConsumers();
}
return(STATUS_SUCCESS);
}
/*
* Actually allocate the page.
*/
Page = MmAllocPage(Consumer);
if (Page == 0)
{
KeBugCheck(NO_PAGES_AVAILABLE);
}
if(Consumer == MC_USER) MmInsertLRULastUserPage(Page);
*AllocatedPage = Page;
if (MmAvailablePages < MiMinimumAvailablePages)
{
MmRebalanceMemoryConsumers();
}
return(STATUS_SUCCESS);
}
VOID NTAPI
MiBalancerThread(PVOID Unused)
{
PVOID WaitObjects[2];
NTSTATUS Status;
ULONG i;
WaitObjects[0] = &MiBalancerEvent;
WaitObjects[1] = &MiBalancerTimer;
while (1)
{
Status = KeWaitForMultipleObjects(2,
WaitObjects,
WaitAny,
Executive,
KernelMode,
FALSE,
NULL,
NULL);
if (Status == STATUS_WAIT_0 || Status == STATUS_WAIT_1)
{
ULONG InitialTarget = 0;
#if (_MI_PAGING_LEVELS == 2)
if (!MiIsBalancerThread())
{
/* Clean up the unused PDEs */
ULONG_PTR Address;
PEPROCESS Process = PsGetCurrentProcess();
/* Acquire PFN lock */
KIRQL OldIrql = MiAcquirePfnLock();
PMMPDE pointerPde;
for (Address = (ULONG_PTR)MI_LOWEST_VAD_ADDRESS;
Address < (ULONG_PTR)MM_HIGHEST_VAD_ADDRESS;
Address += (PAGE_SIZE * PTE_COUNT))
{
if (MiQueryPageTableReferences((PVOID)Address) == 0)
{
pointerPde = MiAddressToPde(Address);
if (pointerPde->u.Hard.Valid)
MiDeletePte(pointerPde, MiPdeToPte(pointerPde), Process, NULL);
ASSERT(pointerPde->u.Hard.Valid == 0);
}
}
/* Release lock */
MiReleasePfnLock(OldIrql);
}
#endif
do
{
ULONG OldTarget = InitialTarget;
/* Trim each consumer */
for (i = 0; i < MC_MAXIMUM; i++)
{
InitialTarget = MiTrimMemoryConsumer(i, InitialTarget);
}
/* No pages left to swap! */
if (InitialTarget != 0 &&
InitialTarget == OldTarget)
{
/* Game over */
KeBugCheck(NO_PAGES_AVAILABLE);
}
}
while (InitialTarget != 0);
}
else
{
DPRINT1("KeWaitForMultipleObjects failed, status = %x\n", Status);
KeBugCheck(MEMORY_MANAGEMENT);
}
}
}
BOOLEAN MmRosNotifyAvailablePage(PFN_NUMBER Page)
{
PLIST_ENTRY Entry;
PMM_ALLOCATION_REQUEST Request;
PMMPFN Pfn1;
/* Make sure the PFN lock is held */
MI_ASSERT_PFN_LOCK_HELD();
if (!MiMinimumAvailablePages)
{
/* Dirty way to know if we were initialized. */
return FALSE;
}
Entry = ExInterlockedRemoveHeadList(&AllocationListHead, &AllocationListLock);
if (!Entry)
return FALSE;
Request = CONTAINING_RECORD(Entry, MM_ALLOCATION_REQUEST, ListEntry);
MiZeroPhysicalPage(Page);
Request->Page = Page;
Pfn1 = MiGetPfnEntry(Page);
ASSERT(Pfn1->u3.e2.ReferenceCount == 0);
Pfn1->u3.e2.ReferenceCount = 1;
Pfn1->u3.e1.PageLocation = ActiveAndValid;
/* This marks the PFN as a ReactOS PFN */
Pfn1->u4.AweAllocation = TRUE;
/* Allocate the extra ReactOS Data and zero it out */
Pfn1->u1.SwapEntry = 0;
Pfn1->RmapListHead = NULL;
KeSetEvent(&Request->Event, IO_NO_INCREMENT, FALSE);
return TRUE;
}
VOID
INIT_FUNCTION
NTAPI
MiInitBalancerThread(VOID)
{
KPRIORITY Priority;
NTSTATUS Status;
#if !defined(__GNUC__)
LARGE_INTEGER dummyJunkNeeded;
dummyJunkNeeded.QuadPart = -20000000; /* 2 sec */
;
#endif
KeInitializeEvent(&MiBalancerEvent, SynchronizationEvent, FALSE);
KeInitializeTimerEx(&MiBalancerTimer, SynchronizationTimer);
KeSetTimerEx(&MiBalancerTimer,
#if defined(__GNUC__)
(LARGE_INTEGER)(LONGLONG)-20000000LL, /* 2 sec */
#else
dummyJunkNeeded,
#endif
2000, /* 2 sec */
NULL);
Status = PsCreateSystemThread(&MiBalancerThreadHandle,
THREAD_ALL_ACCESS,
NULL,
NULL,
&MiBalancerThreadId,
MiBalancerThread,
NULL);
if (!NT_SUCCESS(Status))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
Priority = LOW_REALTIME_PRIORITY + 1;
NtSetInformationThread(MiBalancerThreadHandle,
ThreadPriority,
&Priority,
sizeof(Priority));
}
/* EOF */
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