####
#### DO NOT USE!  HERE FOR REFERENCE ONLY.  see smallpv4.diff
####
==== //depot/yahoo/ybsd_6/src/sys/amd64/amd64/pmap.c#8 - /home/peter/ybsd_6/src/sys/amd64/amd64/pmap.c ====
@@ -1472,25 +1472,31 @@
 	pv_entry_t pv;
 
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+#ifndef SMALL_PV
 	if (m->md.pv_list_count < pmap->pm_stats.resident_count) {
+#endif
 		TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
 			if (pmap == pv->pv_pmap && va == pv->pv_va) 
 				break;
 		}
+#ifndef SMALL_PV
 	} else {
 		TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) {
 			if (va == pv->pv_va) 
 				break;
 		}
 	}
+#endif
 	KASSERT(pv != NULL, ("pmap_remove_entry: pv not found"));
 	TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
 	m->md.pv_list_count--;
 	if (TAILQ_EMPTY(&m->md.pv_list))
 		vm_page_flag_clear(m, PG_WRITEABLE);
+#ifndef SMALL_PV
 	TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
+#endif
 	free_pv_entry(pv);
 }
 
 /*
@@ -1509,9 +1515,11 @@
 	pv->pv_pmap = pmap;
 
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+#ifndef SMALL_PV
 	TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist);
+#endif
 	TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
 	m->md.pv_list_count++;
 }
 
@@ -1733,9 +1741,11 @@
 			if (pmap_track_modified(pv->pv_va))
 				vm_page_dirty(m);
 		}
 		pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
+#ifndef SMALL_PV
 		TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist);
+#endif
 		TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
 		m->md.pv_list_count--;
 		pmap_unuse_pt(pv->pv_pmap, pv->pv_va, ptepde);
 		PMAP_UNLOCK(pv->pv_pmap);
@@ -2533,8 +2543,9 @@
 pmap_remove_pages(pmap, sva, eva)
 	pmap_t pmap;
 	vm_offset_t sva, eva;
 {
+#ifndef SMALL_PV
 	pt_entry_t *pte, tpte;
 	vm_page_t m;
 	pv_entry_t pv, npv;
 
@@ -2609,8 +2620,9 @@
 	}
 	pmap_invalidate_all(pmap);
 	PMAP_UNLOCK(pmap);
 	vm_page_unlock_queues();
+#endif
 }
 
 /*
  *	pmap_is_modified:
==== //depot/yahoo/ybsd_6/src/sys/amd64/include/pmap.h#3 - /home/peter/ybsd_6/src/sys/amd64/include/pmap.h ====
@@ -264,9 +264,11 @@
 typedef struct pv_entry {
 	pmap_t		pv_pmap;	/* pmap where mapping lies */
 	vm_offset_t	pv_va;		/* virtual address for mapping */
 	TAILQ_ENTRY(pv_entry)	pv_list;
+#ifndef SMALL_PV
 	TAILQ_ENTRY(pv_entry)	pv_plist;
+#endif
 } *pv_entry_t;
 
 #ifdef	_KERNEL
 
==== //depot/yahoo/ybsd_6/src/sys/conf/options.amd64#5 - /home/peter/ybsd_6/src/sys/conf/options.amd64 ====
@@ -5,8 +5,9 @@
 AUTO_EOI_2		opt_auto_eoi.h
 MAXMEM
 PERFMON			opt_perfmon.h
 PMAP_SHPGPERPROC	opt_pmap.h
+SMALL_PV		opt_pmap.h
 MP_WATCHDOG		opt_mp_watchdog.h
 
 # Options for emulators.  These should only be used at config time, so
 # they are handled like options for static filesystems