[ros-diffs] [ros-arm-bringup] 41529: - Initialize count of System PTEs: - Use 7000 for systems with 19MB of RAM or less, 11000 for systems between 19 and 32MB of RAM, and 22000 for systems with more than that. - Windows will go up to 50000 on server machines, but this is likely not needed now (22000 system PTEs is roughly 100 MB). - This now affects the calculation of MmNonPagedSystemStart, which is now correct and reflects the nonpaged address space of the system. - System PTEs are not yet initialized (but their page tables are mapped by the same code which maps nonpaged pool expansion VA page tables).
ros-arm-bringup at svn.reactos.org
ros-arm-bringup at svn.reactos.org
Mon Jun 22 11:34:25 CEST 2009
Author: ros-arm-bringup
Date: Mon Jun 22 13:34:24 2009
New Revision: 41529
URL: http://svn.reactos.org/svn/reactos?rev=41529&view=rev
Log:
- Initialize count of System PTEs:
- Use 7000 for systems with 19MB of RAM or less, 11000 for systems between 19 and 32MB of RAM, and 22000 for systems with more than that.
- Windows will go up to 50000 on server machines, but this is likely not needed now (22000 system PTEs is roughly 100 MB).
- This now affects the calculation of MmNonPagedSystemStart, which is now correct and reflects the nonpaged address space of the system.
- System PTEs are not yet initialized (but their page tables are mapped by the same code which maps nonpaged pool expansion VA page tables).
Modified:
trunk/reactos/ntoskrnl/mm/ARM3/init.c
trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
Modified: trunk/reactos/ntoskrnl/mm/ARM3/init.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/init.c?rev=41529&r1=41528&r2=41529&view=diff
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/init.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/init.c [iso-8859-1] Mon Jun 22 13:34:24 2009
@@ -94,6 +94,13 @@
PVOID MmNonPagedPoolStart;
PVOID MmNonPagedPoolExpansionStart;
PVOID MmNonPagedPoolEnd = (PVOID)0xFFBE0000;
+
+//
+// Windows NT seems to choose between 7000, 11000 and 50000
+// On systems with more than 32MB, this number is then doubled, and further
+// aligned up to a PDE boundary (4MB).
+//
+ULONG MmNumberOfSystemPtes;
/* PRIVATE FUNCTIONS **********************************************************/
@@ -109,11 +116,40 @@
MMPTE TempPde = HyperTemplatePte, TempPte = HyperTemplatePte;
PVOID NonPagedPoolExpansionVa, BaseAddress;
NTSTATUS Status;
+ ULONG OldCount;
BoundaryAddressMultiple.QuadPart = Low.QuadPart = 0;
High.QuadPart = -1;
if (Phase == 0)
{
+ //
+ // Check if this is a machine with less than 19MB of RAM
+ //
+ if (MmNumberOfPhysicalPages < MI_MIN_PAGES_FOR_SYSPTE_TUNING)
+ {
+ //
+ // Use the very minimum of system PTEs
+ //
+ MmNumberOfSystemPtes = 7000;
+ }
+ else
+ {
+ //
+ // Use the default, but check if we have more than 32MB of RAM
+ //
+ MmNumberOfSystemPtes = 11000;
+ if (MmNumberOfPhysicalPages > MI_MIN_PAGES_FOR_SYSPTE_BOOST)
+ {
+ //
+ // Double the amount of system PTEs
+ //
+ MmNumberOfSystemPtes <<= 1;
+ }
+ }
+
+ DPRINT1("System PTE count has been tuned to %d (%d bytes)\n",
+ MmNumberOfSystemPtes, MmNumberOfSystemPtes * PAGE_SIZE);
+
//
// Check if this is a machine with less than 256MB of RAM, and no overide
//
@@ -212,28 +248,47 @@
NonPagedPoolExpansionVa = MmNonPagedPoolStart;
DPRINT1("NP Pool has been tuned to: %d bytes and %d bytes\n",
MmSizeOfNonPagedPoolInBytes, MmMaximumNonPagedPoolInBytes);
- DPRINT1("NP Expansion VA begins at: %p and ends at: %p\n",
- MmNonPagedPoolStart, MmNonPagedPoolEnd);
-
- //
- // Now calculate the nonpaged system VA region
- // This includes nonpaged pool expansion (above) and the system PTEs
- // Since there are no system PTEs yet, this is (for now) the same
- //
- MmNonPagedSystemStart = MmNonPagedPoolStart;
- DPRINT1("NP System VA (later will be System PTEs) start at: %p\n",
- MmNonPagedSystemStart);
-
+
+ //
+ // Now calculate the nonpaged system VA region, which includes the
+ // nonpaged pool expansion (above) and the system PTEs. Note that it is
+ // then aligned to a PDE boundary (4MB).
+ //
+ MmNonPagedSystemStart = (PVOID)((ULONG_PTR)MmNonPagedPoolStart -
+ (MmNumberOfSystemPtes + 1) * PAGE_SIZE);
+ MmNonPagedSystemStart = (PVOID)((ULONG_PTR)MmNonPagedSystemStart &
+ ~((4 * 1024 * 1024) - 1));
+
+ //
+ // Don't let it go below the minimum
+ //
+ if (MmNonPagedSystemStart < (PVOID)0xEB000000)
+ {
+ //
+ // This is a hard-coded limit in the Windows NT address space
+ //
+ MmNonPagedSystemStart = (PVOID)0xEB000000;
+
+ //
+ // Reduce the amount of system PTEs to reach this point
+ //
+ MmNumberOfSystemPtes = ((ULONG_PTR)MmNonPagedPoolStart -
+ (ULONG_PTR)MmNonPagedSystemStart) >>
+ PAGE_SHIFT;
+ MmNumberOfSystemPtes--;
+ ASSERT(MmNumberOfSystemPtes > 1000);
+ }
+
//
// Non paged pool should come after the PFN database, but since we are
// co-existing with the ReactOS NP pool, our "ARM Pool" will instead
// start at this arbitrarly chosen base address.
// When ARM pool becomes non paged pool, this needs to be changed.
//
+ DPRINT1("System PTE VA starts at: %p\n", MmNonPagedSystemStart);
+ DPRINT1("NP Expansion VA begins at: %p and ends at: %p\n",
+ MmNonPagedPoolStart, MmNonPagedPoolEnd);
MmNonPagedPoolStart = (PVOID)0xA0000000;
- DPRINT1("NP VA begins at: %p and ends at: %p\n",
- MmNonPagedPoolStart,
- (ULONG_PTR)MmNonPagedPoolStart + MmSizeOfNonPagedPoolInBytes);
//
// Now we actually need to get these many physical pages. Nonpaged pool
@@ -244,11 +299,14 @@
High,
BoundaryAddressMultiple);
ASSERT(PageFrameIndex != 0);
+ DPRINT1("NP VA begins at: %p and ends at: %p\n",
+ MmNonPagedPoolStart,
+ (ULONG_PTR)MmNonPagedPoolStart + MmSizeOfNonPagedPoolInBytes);
DPRINT1("NP PA PFN begins at: %lx\n", PageFrameIndex);
//
// Now we need some pages to create the page tables for the NP system VA
- // which would normally include system PTEs and expansion NP
+ // which includes system PTEs and expansion NP
//
StartPde = MiAddressToPde(MmNonPagedSystemStart);
EndPde = MiAddressToPde((PVOID)((ULONG_PTR)MmNonPagedPoolEnd - 1));
@@ -311,7 +369,7 @@
}
//
- // Now rememeber where the expansion starts
+ // Now remember where the expansion starts
//
MmNonPagedPoolExpansionStart = NonPagedPoolExpansionVa;
@@ -348,7 +406,7 @@
ASSERT(Status == STATUS_SUCCESS);
//
- // And we need one more for the system NP (expansion NP only for now)
+ // And we need one more for the system NP
//
BaseAddress = MmNonPagedSystemStart;
Status = MmCreateMemoryArea(MmGetKernelAddressSpace(),
@@ -364,9 +422,27 @@
ASSERT(Status == STATUS_SUCCESS);
//
+ // Sanity check: make sure we have properly defined the system PTE space
+ //
+ ASSERT(MiAddressToPte(MmNonPagedSystemStart) <
+ MiAddressToPte(MmNonPagedPoolExpansionStart));
+
+ //
// Now go ahead and initialize the ARM pool
//
MiInitializeArmPool();
+
+ //
+ // We PDE-aligned the nonpaged system start VA, so haul some extra PTEs!
+ //
+ PointerPte = MiAddressToPte(MmNonPagedSystemStart);
+ OldCount = MmNumberOfSystemPtes;
+ MmNumberOfSystemPtes = MiAddressToPte(MmNonPagedPoolExpansionStart) -
+ PointerPte;
+ MmNumberOfSystemPtes--;
+ ASSERT((MmNumberOfSystemPtes - OldCount) <= 1000);
+ DPRINT1("Final System PTE count: %d (%d bytes)\n",
+ MmNumberOfSystemPtes, MmNumberOfSystemPtes * PAGE_SIZE);
}
//
Modified: trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/miarm.h?rev=41529&r1=41528&r2=41529&view=diff
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] Mon Jun 22 13:34:24 2009
@@ -7,6 +7,8 @@
*/
#define MI_MIN_PAGES_FOR_NONPAGED_POOL_TUNING ((255*1024*1024) >> PAGE_SHIFT)
+#define MI_MIN_PAGES_FOR_SYSPTE_TUNING ((19*1024*1024) >> PAGE_SHIFT)
+#define MI_MIN_PAGES_FOR_SYSPTE_BOOST ((32*1024*1024) >> PAGE_SHIFT)
#define MI_MAX_INIT_NONPAGED_POOL_SIZE (128 * 1024 * 1024)
#define MI_MAX_NONPAGED_POOL_SIZE (128 * 1024 * 1024)
#define MI_MAX_FREE_PAGE_LISTS 4
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