Index: /trunk/src/VBox/VMM/PGMInternal.h
===================================================================
--- /trunk/src/VBox/VMM/PGMInternal.h	(revision 22782)
+++ /trunk/src/VBox/VMM/PGMInternal.h	(revision 22783)
@@ -1864,4 +1864,6 @@
     /** Times we've had to flush duplicates for dirty page management. */
     STAMCOUNTER                 StatDirtyPageDupFlush;
+    /** Times we've had to flush because of overflow. */
+    STAMCOUNTER                 StatDirtyPageOverFlowFlush;
 
     /** The high wather mark for cModifiedPages. */
Index: /trunk/src/VBox/VMM/PGMPool.cpp
===================================================================
--- /trunk/src/VBox/VMM/PGMPool.cpp	(revision 22782)
+++ /trunk/src/VBox/VMM/PGMPool.cpp	(revision 22783)
@@ -382,4 +382,5 @@
     STAM_REG(pVM, &pPool->StatDirtyPage,                STAMTYPE_COUNTER,   "/PGM/Pool/Monitor/Dirty/Pages",        STAMUNIT_OCCURENCES,     "Times we've called pgmPoolAddDirtyPage.");
     STAM_REG(pVM, &pPool->StatDirtyPageDupFlush,        STAMTYPE_COUNTER,   "/PGM/Pool/Monitor/Dirty/FlushDup",     STAMUNIT_OCCURENCES,     "Times we've had to flush duplicates for dirty page management.");
+    STAM_REG(pVM, &pPool->StatDirtyPageOverFlowFlush,   STAMTYPE_COUNTER,   "/PGM/Pool/Monitor/Dirty/FlushOverflow",STAMUNIT_OCCURENCES,     "Times we've had to flush because of overflow.");
     
 # endif
Index: /trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp	(revision 22782)
+++ /trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp	(revision 22783)
@@ -1601,5 +1601,8 @@
 
     if (pPool->cDirtyPages >= RT_ELEMENTS(pPool->aIdxDirtyPages))
+    {
+        STAM_COUNTER_INC(&pPool->StatDirtyPageOverFlowFlush);
         pgmPoolFlushDirtyPage(pVM, pPool, idxFree, true /* force removal */);
+    }
     Assert(pPool->cDirtyPages < RT_ELEMENTS(pPool->aIdxDirtyPages));
     AssertMsg(pPool->aIdxDirtyPages[idxFree] == NIL_PGMPOOL_IDX, ("idxFree=%d cDirtyPages=%d\n", idxFree, pPool->cDirtyPages));