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[NTOSKRNL]

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- Fix incorrect placement of the PDE freeing code which caused a deadlock to occur if a low memory condition was indicated by ARM3

svn path=/trunk/; revision=56050
This commit is contained in:
Cameron Gutman 2012-03-05 19:40:44 +00:00
parent 9973fe86bf
commit d78bbd2aab
1 changed files with 27 additions and 28 deletions
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55
reactos/ntoskrnl/mm/balance.c
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@ -245,33 +245,6 @@ VOID
NTAPI
MmRebalanceMemoryConsumers(VOID)
{
#if (_MI_PAGING_LEVELS == 2)
if(!MiIsBalancerThread())
{
/* Clean up the unused PDEs */
ULONG_PTR Address;
PEPROCESS Process = PsGetCurrentProcess();
/* Acquire PFN lock */
KIRQL OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
PMMPDE pointerPde;
for(Address = (ULONG_PTR)MI_LOWEST_VAD_ADDRESS;
Address < (ULONG_PTR)MM_HIGHEST_VAD_ADDRESS;
Address += (PAGE_SIZE * PTE_COUNT))
{
if(MmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)] == 0)
{
pointerPde = MiAddressToPde(Address);
if(pointerPde->u.Hard.Valid)
MiDeletePte(pointerPde, MiPdeToPte(pointerPde), Process, NULL);
ASSERT(pointerPde->u.Hard.Valid == 0);
}
}
/* Release lock */
KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
}
#endif
if (MiBalancerThreadHandle != NULL &&
!MiIsBalancerThread())
{
@ -405,8 +378,34 @@ MiBalancerThread(PVOID Unused)
if (Status == STATUS_WAIT_0 || Status == STATUS_WAIT_1)
{
ULONG InitialTarget = 0;
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 = KeAcquireQueuedSpinLock(LockQueuePfnLock);
PMMPDE pointerPde;
for(Address = (ULONG_PTR)MI_LOWEST_VAD_ADDRESS;
Address < (ULONG_PTR)MM_HIGHEST_VAD_ADDRESS;
Address += (PAGE_SIZE * PTE_COUNT))
{
if(MmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)] == 0)
{
pointerPde = MiAddressToPde(Address);
if(pointerPde->u.Hard.Valid)
MiDeletePte(pointerPde, MiPdeToPte(pointerPde), Process, NULL);
ASSERT(pointerPde->u.Hard.Valid == 0);
}
}
/* Release lock */
KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
}
#endif
do
{
ULONG OldTarget = InitialTarget;