diff --git a/sdk/xtdk/amd64/mmtypes.h b/sdk/xtdk/amd64/mmtypes.h
index 7f7e84a..0ce6129 100644
--- a/sdk/xtdk/amd64/mmtypes.h
+++ b/sdk/xtdk/amd64/mmtypes.h
@@ -110,6 +110,12 @@
 /* Trampoline code address */
 #define MM_TRAMPOLINE_ADDRESS                      0x80000
 
+/* Pool block size */
+#define MM_POOL_BLOCK_SIZE                         16
+
+/* Number of pool lists per page */
+#define MM_POOL_LISTS_PER_PAGE                     (MM_PAGE_SIZE / MM_POOL_BLOCK_SIZE)
+
 /* Page size enumeration list */
 typedef enum _PAGE_SIZE
 {
@@ -317,4 +323,22 @@ typedef struct _MMPFN
     } u4;
 } MMPFN, *PMMPFN;
 
+/* Pool descriptor structure definition */
+typedef struct _POOL_DESCRIPTOR
+{
+    LIST_ENTRY ListHeads[MM_POOL_LISTS_PER_PAGE];
+    PVOID LockAddress;
+    ULONG PoolIndex;
+    LONG PendingFreeDepth;
+    PVOID PendingFrees;
+    MMPOOL_TYPE PoolType;
+    ULONG RunningFrees;
+    ULONG RunningAllocations;
+    ULONG Threshold;
+    ULONG TotalPages;
+    ULONG TotalBigAllocations;
+    SIZE_T TotalBytes;
+    SIZE_T Reserved;
+} POOL_DESCRIPTOR, *PPOOL_DESCRIPTOR;
+
 #endif /* __XTDK_AMD64_MMTYPES_H */
diff --git a/sdk/xtdk/amd64/xtstruct.h b/sdk/xtdk/amd64/xtstruct.h
index 64aa6d4..6868828 100644
--- a/sdk/xtdk/amd64/xtstruct.h
+++ b/sdk/xtdk/amd64/xtstruct.h
@@ -61,6 +61,7 @@ typedef struct _MMPTE_PROTOTYPE MMPTE_PROTOTYPE, *PMMPTE_PROTOTYPE;
 typedef struct _MMPTE_SOFTWARE MMPTE_SOFTWARE, *PMMPTE_SOFTWARE;
 typedef struct _MMPTE_SUBSECTION MMPTE_SUBSECTION, *PMMPTE_SUBSECTION;
 typedef struct _MMPTE_TRANSITION MMPTE_TRANSITION, *PMMPTE_TRANSITION;
+typedef struct _POOL_DESCRIPTOR POOL_DESCRIPTOR, *PPOOL_DESCRIPTOR;
 typedef struct _THREAD_ENVIRONMENT_BLOCK THREAD_ENVIRONMENT_BLOCK, *PTHREAD_ENVIRONMENT_BLOCK;
 
 /* Unions forward references */
diff --git a/sdk/xtdk/i686/mmtypes.h b/sdk/xtdk/i686/mmtypes.h
index 4445543..c539497 100644
--- a/sdk/xtdk/i686/mmtypes.h
+++ b/sdk/xtdk/i686/mmtypes.h
@@ -108,6 +108,12 @@
 /* Trampoline code address */
 #define MM_TRAMPOLINE_ADDRESS                      0x80000
 
+/* Pool block size */
+#define MM_POOL_BLOCK_SIZE                         8
+
+/* Number of pool lists per page */
+#define MM_POOL_LISTS_PER_PAGE                     (MM_PAGE_SIZE / MM_POOL_BLOCK_SIZE)
+
 /* Page size enumeration list */
 typedef enum _PAGE_SIZE
 {
@@ -410,4 +416,22 @@ typedef struct _MMPFN
     } u4;
 } MMPFN, *PMMPFN;
 
+/* Pool descriptor structure definition */
+typedef struct _POOL_DESCRIPTOR
+{
+    LIST_ENTRY ListHeads[MM_POOL_LISTS_PER_PAGE];
+    PVOID LockAddress;
+    ULONG PoolIndex;
+    LONG PendingFreeDepth;
+    PVOID PendingFrees;
+    MMPOOL_TYPE PoolType;
+    ULONG RunningFrees;
+    ULONG RunningAllocations;
+    ULONG Threshold;
+    ULONG TotalPages;
+    ULONG TotalBigAllocations;
+    SIZE_T TotalBytes;
+    SIZE_T Reserved;
+} POOL_DESCRIPTOR, *PPOOL_DESCRIPTOR;
+
 #endif /* __XTDK_I686_MMTYPES_H */
diff --git a/sdk/xtdk/i686/xtstruct.h b/sdk/xtdk/i686/xtstruct.h
index 2f034d9..cb0a3d6 100644
--- a/sdk/xtdk/i686/xtstruct.h
+++ b/sdk/xtdk/i686/xtstruct.h
@@ -70,6 +70,7 @@ typedef struct _MMPML3_PTE_PROTOTYPE MMPML3_PTE_PROTOTYPE, *PMMPML3_PTE_PROTOTYP
 typedef struct _MMPML3_PTE_SOFTWARE MMPML3_PTE_SOFTWARE, *PMMPML3_PTE_SOFTWARE;
 typedef struct _MMPML3_PTE_SUBSECTION MMPML3_PTE_SUBSECTION, *PMMPML3_PTE_SUBSECTION;
 typedef struct _MMPML3_PTE_TRANSITION MMPML3_PTE_TRANSITION, *PMMPML3_PTE_TRANSITION;
+typedef struct _POOL_DESCRIPTOR POOL_DESCRIPTOR, *PPOOL_DESCRIPTOR;
 typedef struct _THREAD_ENVIRONMENT_BLOCK THREAD_ENVIRONMENT_BLOCK, *PTHREAD_ENVIRONMENT_BLOCK;
 
 /* Unions forward references */
diff --git a/sdk/xtdk/mmtypes.h b/sdk/xtdk/mmtypes.h
index 7858784..93a1142 100644
--- a/sdk/xtdk/mmtypes.h
+++ b/sdk/xtdk/mmtypes.h
@@ -33,9 +33,13 @@
 #define MM_POOL_INVALID_ALLOC_RUNLEVEL             8
 #define MM_POOL_INVALID_FREE_RUNLEVEL              9
 
+/* Big allocations entry flags */
+#define MM_POOL_BIG_ALLOCATIONS_ENTRY_FREE         0x1
+
 /* Number of reserved zeroed PTEs */
 #define MM_RESERVED_ZERO_PTES                      32
 
+
 /* Memory manager page lists */
 typedef enum _MMPAGELISTS
 {
@@ -66,14 +70,14 @@ typedef enum _MMPOOL_TYPE
     NonPagedPoolMustSucceed = 2,
     NonPagedPoolCacheAligned = 4,
     PagedPoolCacheAligned = 5,
-    NonPagedPoolCacheAlignedMustS = 6,
+    NonPagedPoolCacheAlignedMustSucceed = 6,
     MaxPoolType = 7,
     NonPagedPoolSession = 32,
     PagedPoolSession = 33,
     NonPagedPoolMustSucceedSession = 34,
     NonPagedPoolCacheAlignedSession = 36,
     PagedPoolCacheAlignedSession = 37,
-    NonPagedPoolCacheAlignedMustSSession = 38
+    NonPagedPoolCacheAlignedMustSucceedSession = 38
 } MMPOOL_TYPE, *PMMPOOL_TYPE;
 
 /* Page table pool types */
@@ -192,4 +196,39 @@ typedef struct _PHYSICAL_MEMORY_DESCRIPTOR
     PHYSICAL_MEMORY_RUN Run[1];
 } PHYSICAL_MEMORY_DESCRIPTOR, *PPHYSICAL_MEMORY_DESCRIPTOR;
 
+/* Pool header structure definition */
+typedef struct _POOL_HEADER
+{
+    union
+    {
+        struct
+        {
+            USHORT PreviousSize:9;
+            USHORT PoolIndex:7;
+            USHORT BlockSize:9;
+            USHORT PoolType:7;
+        };
+        ULONG Long;
+    };
+    union
+    {
+        ULONG PoolTag;
+        PEPROCESS ProcessBilled;
+        struct
+        {
+            USHORT AllocatorBackTraceIndex;
+            USHORT PoolTagHash;
+        };
+    };
+} POOL_HEADER, *PPOOL_HEADER;
+
+/* Pool descriptor structure definition */
+typedef struct _POOL_TRACKER_BIG_ALLOCATIONS
+{
+    PVOID VirtualAddress;
+    ULONG Key;
+    ULONG NumberOfPages;
+    PVOID QuotaObject;
+} POOL_TRACKER_BIG_ALLOCATIONS, *PPOOL_TRACKER_BIG_ALLOCATIONS;
+
 #endif /* __XTDK_MMTYPES_H */
diff --git a/sdk/xtdk/xtstruct.h b/sdk/xtdk/xtstruct.h
index 31c2337..9c8f999 100644
--- a/sdk/xtdk/xtstruct.h
+++ b/sdk/xtdk/xtstruct.h
@@ -312,6 +312,8 @@ typedef struct _PECOFF_IMAGE_SECTION_HEADER PECOFF_IMAGE_SECTION_HEADER, *PPECOF
 typedef struct _PECOFF_IMAGE_VXD_HEADER PECOFF_IMAGE_VXD_HEADER, *PPECOFF_IMAGE_VXD_HEADER;
 typedef struct _PHYSICAL_MEMORY_DESCRIPTOR PHYSICAL_MEMORY_DESCRIPTOR, *PPHYSICAL_MEMORY_DESCRIPTOR;
 typedef struct _PHYSICAL_MEMORY_RUN PHYSICAL_MEMORY_RUN, *PPHYSICAL_MEMORY_RUN;
+typedef struct _POOL_HEADER POOL_HEADER, *PPOOL_HEADER;
+typedef struct _POOL_TRACKER_BIG_ALLOCATIONS POOL_TRACKER_BIG_ALLOCATIONS, *PPOOL_TRACKER_BIG_ALLOCATIONS;
 typedef struct _PROCESSOR_IDENTITY PROCESSOR_IDENTITY, *PPROCESSOR_IDENTITY;
 typedef struct _PROCESSOR_POWER_STATE PROCESSOR_POWER_STATE, *PPROCESSOR_POWER_STATE;
 typedef struct _RTL_BITMAP RTL_BITMAP, *PRTL_BITMAP;