Index: sys/conf/options.powerpc
===================================================================
--- sys/conf/options.powerpc
+++ sys/conf/options.powerpc
@@ -19,6 +19,7 @@
 GFB_NO_FONT_LOADING	opt_gfb.h
 GFB_NO_MODE_CHANGE	opt_gfb.h
 
+MOEA64_STATS		opt_pmap.h
 MPC85XX			opt_platform.h
 POWERMAC		opt_platform.h
 PS3			opt_platform.h
Index: sys/powerpc/aim/mmu_oea64.h
===================================================================
--- sys/powerpc/aim/mmu_oea64.h
+++ sys/powerpc/aim/mmu_oea64.h
@@ -72,8 +72,13 @@
  * Statistics
  */
 
+#ifdef MOEA64_STATS
 extern u_int	moea64_pte_valid;
 extern u_int	moea64_pte_overflow;
+#define STAT_MOEA64(x)	x
+#else
+#define	STAT_MOEA64(x) ((void)0)
+#endif
 
 /*
  * State variables
Index: sys/powerpc/aim/mmu_oea64.c
===================================================================
--- sys/powerpc/aim/mmu_oea64.c
+++ sys/powerpc/aim/mmu_oea64.c
@@ -46,6 +46,7 @@
  */
 
 #include "opt_kstack_pages.h"
+#include "opt_pmap.h"
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -200,6 +201,7 @@
 
 static boolean_t moea64_initialized = FALSE;
 
+#ifdef MOEA64_STATS
 /*
  * Statistics.
  */
@@ -218,6 +220,7 @@
     &moea64_pvo_enter_calls, 0, "");
 SYSCTL_INT(_machdep, OID_AUTO, moea64_pvo_remove_calls, CTLFLAG_RD,
     &moea64_pvo_remove_calls, 0, "");
+#endif
 
 vm_offset_t	moea64_scratchpage_va[2];
 struct pvo_entry *moea64_scratchpage_pvo[2];
@@ -1434,7 +1437,7 @@
 
 				/* If not in page table, reinsert it */
 				if (MOEA64_PTE_SYNCH(mmu, oldpvo) < 0) {
-					moea64_pte_overflow--;
+					STAT_MOEA64(moea64_pte_overflow--);
 					MOEA64_PTE_INSERT(mmu, oldpvo);
 				}
 
@@ -2524,7 +2527,7 @@
 
 	PMAP_LOCK_ASSERT(pvo->pvo_pmap, MA_OWNED);
 
-	moea64_pvo_enter_calls++;
+	STAT_MOEA64(moea64_pvo_enter_calls++);
 
 	/*
 	 * Add to pmap list
@@ -2559,7 +2562,7 @@
 		panic("moea64_pvo_enter: overflow");
 	}
 
-	moea64_pvo_entries++;
+	STAT_MOEA64(moea64_pvo_entries++);
 
 	if (pvo->pvo_pmap == kernel_pmap)
 		isync();
@@ -2658,8 +2661,8 @@
 		}
 	}
 
-	moea64_pvo_entries--;
-	moea64_pvo_remove_calls++;
+	STAT_MOEA64(moea64_pvo_entries--);
+	STAT_MOEA64(moea64_pvo_remove_calls++);
 }
 
 static void
Index: sys/powerpc/aim/moea64_native.c
===================================================================
--- sys/powerpc/aim/moea64_native.c
+++ sys/powerpc/aim/moea64_native.c
@@ -88,6 +88,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_pmap.h"
+
 /*
  * Native 64-bit page table operations for running without a hypervisor.
  */
@@ -332,7 +334,7 @@
 	if ((be64toh(pt->pte_hi & LPTE_AVPN_MASK)) !=
 	    (properpt.pte_hi & LPTE_AVPN_MASK)) {
 		/* Evicted */
-		moea64_pte_overflow--;
+		STAT_MOEA64(moea64_pte_overflow--);
 		rw_runlock(&moea64_eviction_lock);
 		return (-1);
 	}
@@ -352,7 +354,7 @@
 	rw_runlock(&moea64_eviction_lock);
 
 	/* Keep statistics */
-	moea64_pte_valid--;
+	STAT_MOEA64(moea64_pte_valid--);
 
 	return (ptelo & (LPTE_CHG | LPTE_REF));
 }
@@ -656,8 +658,8 @@
 		    (ADDR_API_SHFT64 - ADDR_PIDX_SHFT);
 		PTESYNC();
 		TLBIE(va);
-		moea64_pte_valid--;
-		moea64_pte_overflow++;
+		STAT_MOEA64(moea64_pte_valid--);
+		STAT_MOEA64(moea64_pte_overflow++);
 	}
 
 	/*
@@ -670,7 +672,7 @@
 	PTESYNC();
 
 	/* Keep statistics */
-	moea64_pte_valid++;
+	STAT_MOEA64(moea64_pte_valid++);
 
 	return (k);
 }
Index: sys/powerpc/ps3/mmu_ps3.c
===================================================================
--- sys/powerpc/ps3/mmu_ps3.c
+++ sys/powerpc/ps3/mmu_ps3.c
@@ -28,6 +28,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_pmap.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/ktr.h>
@@ -224,14 +226,14 @@
 	mtx_lock(&mps3_table_lock);
 	refchg = mps3_pte_synch_locked(pvo);
 	if (refchg < 0) {
-		moea64_pte_overflow--;
+		STAT_MOEA64(moea64_pte_overflow--);
 		mtx_unlock(&mps3_table_lock);
 		return (-1);
 	}
 	/* XXX: race on RC bits between unset and sync. Anything to do? */
 	lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, 0, 0);
 	mtx_unlock(&mps3_table_lock);
-	moea64_pte_valid--;
+	STAT_MOEA64(moea64_pte_valid--);
 
 	return (refchg & (LPTE_REF | LPTE_CHG));
 }
@@ -272,13 +274,13 @@
 		pvo->pvo_vaddr |= PVO_HID;
 	pvo->pvo_pte.slot = index;
 
-	moea64_pte_valid++;
+	STAT_MOEA64(moea64_pte_valid++);
 
 	if (evicted.pte_hi) {
 		KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
 		    ("Evicted a wired PTE"));
-		moea64_pte_valid--;
-		moea64_pte_overflow++;
+		STAT_MOEA64(moea64_pte_valid--);
+		STAT_MOEA64(moea64_pte_overflow++);
 	}
 
 	return (0);
Index: sys/powerpc/pseries/mmu_phyp.c
===================================================================
--- sys/powerpc/pseries/mmu_phyp.c
+++ sys/powerpc/pseries/mmu_phyp.c
@@ -28,6 +28,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_pmap.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/ktr.h>
@@ -364,7 +366,7 @@
 	    ("Error removing page: %d", err));
 
 	if (err == H_NOT_FOUND) {
-		moea64_pte_overflow--;
+		STAT_MOEA64(moea64_pte_overflow--);
 		return (-1);
 	}
 
@@ -485,7 +487,7 @@
 		result = phyp_pft_hcall(H_REMOVE, H_AVPN, index,
 		    evicted.pte_hi & LPTE_AVPN_MASK, 0, &junk, &lastptelo,
 		    &junk);
-		moea64_pte_overflow++;
+		STAT_MOEA64(moea64_pte_overflow++);
 		KASSERT(result == H_SUCCESS || result == H_NOT_FOUND,
 		    ("Error evicting page: %d", (int)result));
 	}