Replace all uses of the vm page queues lock by a r/w lock that is private

to this pmap.c.  This new r/w lock is used primarily to synchronize access
to the PV lists.  However, it will be used in a somewhat unconventional
way.  As finer-grained PV list locking is added to each of the pmap
functions that acquire this r/w lock, its acquisition will be changed from
write to read, enabling concurrent execution of the pmap functions with
finer-grained locking.

X-MFC after:	r236045

1 files changed, 67 insertions, 59 deletions

diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index a32f2ee..337c1ad 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -118,6 +118,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/msgbuf.h>
 #include <sys/mutex.h>
 #include <sys/proc.h>
+#include <sys/rwlock.h>
 #include <sys/sf_buf.h>
 #include <sys/sx.h>
 #include <sys/vmmeter.h>
@@ -236,6 +237,7 @@ static int pat_index[PAT_INDEX_SIZE];	/* cache mode to PAT index conversion */
 static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks);
 static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
 static struct md_page *pv_table;
+static struct rwlock pvh_global_lock;
 static int shpgperproc = PMAP_SHPGPERPROC;
 
 struct pv_chunk *pv_chunkbase;		/* KVA block for pv_chunks */
@@ -392,6 +394,12 @@ pmap_bootstrap(vm_paddr_t firstaddr)
 	kernel_pmap->pm_root = NULL;
 	CPU_FILL(&kernel_pmap->pm_active);	/* don't allow deactivation */
 	TAILQ_INIT(&kernel_pmap->pm_pvchunk);
+
+ 	/*
+	 * Initialize the global pv list lock.
+	 */
+	rw_init(&pvh_global_lock, "pvh global");
+
 	LIST_INIT(&allpmaps);
 
 	/*
@@ -1276,7 +1284,7 @@ invlcaddr(void *caddr)
  * scans are across different pmaps.  It is very wasteful
  * to do an entire invltlb for checking a single mapping.
  *
- * If the given pmap is not the current pmap, vm_page_queue_mtx
+ * If the given pmap is not the current pmap, pvh_global_lock
  * must be held and curthread pinned to a CPU.
  */
 static pt_entry_t *
@@ -1292,7 +1300,7 @@ pmap_pte_quick(pmap_t pmap, vm_offset_t va)
 		/* are we current address space or kernel? */
 		if (pmap_is_current(pmap))
 			return (vtopte(va));
-		mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+		rw_assert(&pvh_global_lock, RA_WLOCKED);
 		KASSERT(curthread->td_pinned > 0, ("curthread not pinned"));
 		newpf = *pde & PG_FRAME;
 		if ((*PMAP1 & PG_FRAME) != newpf) {
@@ -1841,9 +1849,9 @@ _pmap_allocpte(pmap_t pmap, u_int ptepindex, int flags)
 	    VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) {
 		if (flags & M_WAITOK) {
 			PMAP_UNLOCK(pmap);
-			vm_page_unlock_queues();
+			rw_wunlock(&pvh_global_lock);
 			VM_WAIT;
-			vm_page_lock_queues();
+			rw_wlock(&pvh_global_lock);
 			PMAP_LOCK(pmap);
 		}
 
@@ -2339,7 +2347,7 @@ free_pv_entry(pmap_t pmap, pv_entry_t pv)
 	struct pv_chunk *pc;
 	int idx, field, bit;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	PV_STAT(pv_entry_frees++);
 	PV_STAT(pv_entry_spare++);
@@ -2382,8 +2390,8 @@ get_pv_entry(pmap_t pmap, int try)
 	struct pv_chunk *pc;
 	vm_page_t m;
 
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
 	PV_STAT(pv_entry_allocs++);
 	pv_entry_count++;
 	if (pv_entry_count > pv_entry_high_water)
@@ -2455,7 +2463,7 @@ pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va)
 {
 	pv_entry_t pv;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
 		if (pmap == PV_PMAP(pv) && va == pv->pv_va) {
 			TAILQ_REMOVE(&pvh->pv_list, pv, pv_list);
@@ -2473,7 +2481,7 @@ pmap_pv_demote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
 	vm_offset_t va_last;
 	vm_page_t m;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	KASSERT((pa & PDRMASK) == 0,
 	    ("pmap_pv_demote_pde: pa is not 4mpage aligned"));
 
@@ -2506,7 +2514,7 @@ pmap_pv_promote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
 	vm_offset_t va_last;
 	vm_page_t m;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	KASSERT((pa & PDRMASK) == 0,
 	    ("pmap_pv_promote_pde: pa is not 4mpage aligned"));
 
@@ -2547,7 +2555,7 @@ pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
 {
 	struct md_page *pvh;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	pmap_pvh_free(&m->md, pmap, va);
 	if (TAILQ_EMPTY(&m->md.pv_list) && (m->flags & PG_FICTITIOUS) == 0) {
 		pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
@@ -2565,8 +2573,8 @@ pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m)
 {
 	pv_entry_t pv;
 
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
 	pv = get_pv_entry(pmap, FALSE);
 	pv->pv_va = va;
 	TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
@@ -2580,8 +2588,8 @@ pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m)
 {
 	pv_entry_t pv;
 
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
 	if (pv_entry_count < pv_entry_high_water && 
 	    (pv = get_pv_entry(pmap, TRUE)) != NULL) {
 		pv->pv_va = va;
@@ -2600,7 +2608,7 @@ pmap_pv_insert_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
 	struct md_page *pvh;
 	pv_entry_t pv;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	if (pv_entry_count < pv_entry_high_water && 
 	    (pv = get_pv_entry(pmap, TRUE)) != NULL) {
 		pv->pv_va = va;
@@ -2678,7 +2686,7 @@ pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va)
 	 */
 	if (va >= KERNBASE)
 		firstpte = &KPTmap[i386_btop(trunc_4mpage(va))];
-	else if (curthread->td_pinned > 0 && mtx_owned(&vm_page_queue_mtx)) {
+	else if (curthread->td_pinned > 0 && rw_wowned(&pvh_global_lock)) {
 		if ((*PMAP1 & PG_FRAME) != mptepa) {
 			*PMAP1 = mptepa | PG_RW | PG_V | PG_A | PG_M;
 #ifdef SMP
@@ -2837,7 +2845,7 @@ pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va, vm_page_t *free)
 	pt_entry_t oldpte;
 	vm_page_t m;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	oldpte = pte_load_clear(ptq);
 	if (oldpte & PG_W)
@@ -2868,7 +2876,7 @@ pmap_remove_page(pmap_t pmap, vm_offset_t va, vm_page_t *free)
 {
 	pt_entry_t *pte;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	KASSERT(curthread->td_pinned > 0, ("curthread not pinned"));
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	if ((pte = pmap_pte_quick(pmap, va)) == NULL || *pte == 0)
@@ -2900,7 +2908,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
 
 	anyvalid = 0;
 
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	PMAP_LOCK(pmap);
 
@@ -2989,7 +2997,7 @@ out:
 	sched_unpin();
 	if (anyvalid)
 		pmap_invalidate_all(pmap);
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 	pmap_free_zero_pages(free);
 }
@@ -3021,7 +3029,7 @@ pmap_remove_all(vm_page_t m)
 	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
 	    ("pmap_remove_all: page %p is not managed", m));
 	free = NULL;
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	if ((m->flags & PG_FICTITIOUS) != 0)
 		goto small_mappings;
@@ -3062,7 +3070,7 @@ small_mappings:
 	}
 	vm_page_aflag_clear(m, PGA_WRITEABLE);
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	pmap_free_zero_pages(free);
 }
 
@@ -3138,7 +3146,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
 	else {
 		pv_lists_locked = TRUE;
 resume:
-		vm_page_lock_queues();
+		rw_wlock(&pvh_global_lock);
 		sched_pin();
 	}
 	anychanged = FALSE;
@@ -3182,7 +3190,7 @@ resume:
 			} else {
 				if (!pv_lists_locked) {
 					pv_lists_locked = TRUE;
-					if (!mtx_trylock(&vm_page_queue_mtx)) {
+					if (!rw_try_wlock(&pvh_global_lock)) {
 						if (anychanged)
 							pmap_invalidate_all(
 							    pmap);
@@ -3251,7 +3259,7 @@ retry:
 		pmap_invalidate_all(pmap);
 	if (pv_lists_locked) {
 		sched_unpin();
-		vm_page_unlock_queues();
+		rw_wunlock(&pvh_global_lock);
 	}
 	PMAP_UNLOCK(pmap);
 }
@@ -3422,7 +3430,7 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_prot_t access, vm_page_t m,
 
 	mpte = NULL;
 
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	PMAP_LOCK(pmap);
 	sched_pin();
 
@@ -3592,7 +3600,7 @@ validate:
 		pmap_promote_pde(pmap, pde, va);
 
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 }
 
@@ -3607,7 +3615,7 @@ pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot)
 {
 	pd_entry_t *pde, newpde;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 	pde = pmap_pde(pmap, va);
 	if (*pde != 0) {
@@ -3676,7 +3684,7 @@ pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end,
 	psize = atop(end - start);
 	mpte = NULL;
 	m = m_start;
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	PMAP_LOCK(pmap);
 	while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
 		va = start + ptoa(diff);
@@ -3690,7 +3698,7 @@ pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end,
 			    mpte);
 		m = TAILQ_NEXT(m, listq);
 	}
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 }
 
@@ -3707,10 +3715,10 @@ void
 pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot)
 {
 
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	PMAP_LOCK(pmap);
 	(void)pmap_enter_quick_locked(pmap, va, m, prot, NULL);
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 }
 
@@ -3725,7 +3733,7 @@ pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m,
 	KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva ||
 	    (m->oflags & VPO_UNMANAGED) != 0,
 	    ("pmap_enter_quick_locked: managed mapping within the clean submap"));
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
 
 	/*
@@ -3931,9 +3939,9 @@ retry:
 		if (!wired != ((*pde & PG_W) == 0)) {
 			if (!are_queues_locked) {
 				are_queues_locked = TRUE;
-				if (!mtx_trylock(&vm_page_queue_mtx)) {
+				if (!rw_try_wlock(&pvh_global_lock)) {
 					PMAP_UNLOCK(pmap);
-					vm_page_lock_queues();
+					rw_wlock(&pvh_global_lock);
 					goto retry;
 				}
 			}
@@ -3957,7 +3965,7 @@ retry:
 	pmap_pte_release(pte);
 out:
 	if (are_queues_locked)
-		vm_page_unlock_queues();
+		rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 }
 
@@ -3986,7 +3994,7 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len,
 	if (!pmap_is_current(src_pmap))
 		return;
 
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	if (dst_pmap < src_pmap) {
 		PMAP_LOCK(dst_pmap);
 		PMAP_LOCK(src_pmap);
@@ -4076,7 +4084,7 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len,
 	}
 out:
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(src_pmap);
 	PMAP_UNLOCK(dst_pmap);
 }	
@@ -4218,7 +4226,7 @@ pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
 	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
 	    ("pmap_page_exists_quick: page %p is not managed", m));
 	rv = FALSE;
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
 		if (PV_PMAP(pv) == pmap) {
 			rv = TRUE;
@@ -4240,7 +4248,7 @@ pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
 				break;
 		}
 	}
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (rv);
 }
 
@@ -4258,13 +4266,13 @@ pmap_page_wired_mappings(vm_page_t m)
 	count = 0;
 	if ((m->oflags & VPO_UNMANAGED) != 0)
 		return (count);
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	count = pmap_pvh_wired_mappings(&m->md, count);
 	if ((m->flags & PG_FICTITIOUS) == 0) {
 	    count = pmap_pvh_wired_mappings(pa_to_pvh(VM_PAGE_TO_PHYS(m)),
 	        count);
 	}
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (count);
 }
 
@@ -4280,7 +4288,7 @@ pmap_pvh_wired_mappings(struct md_page *pvh, int count)
 	pt_entry_t *pte;
 	pv_entry_t pv;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	sched_pin();
 	TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
 		pmap = PV_PMAP(pv);
@@ -4305,11 +4313,11 @@ pmap_page_is_mapped(vm_page_t m)
 
 	if ((m->oflags & VPO_UNMANAGED) != 0)
 		return (FALSE);
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	rv = !TAILQ_EMPTY(&m->md.pv_list) ||
 	    ((m->flags & PG_FICTITIOUS) == 0 &&
 	    !TAILQ_EMPTY(&pa_to_pvh(VM_PAGE_TO_PHYS(m))->pv_list));
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (rv);
 }
 
@@ -4339,7 +4347,7 @@ pmap_remove_pages(pmap_t pmap)
 		printf("warning: pmap_remove_pages called with non-current pmap\n");
 		return;
 	}
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	PMAP_LOCK(pmap);
 	sched_pin();
 	TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) {
@@ -4451,7 +4459,7 @@ pmap_remove_pages(pmap_t pmap)
 	}
 	sched_unpin();
 	pmap_invalidate_all(pmap);
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	PMAP_UNLOCK(pmap);
 	pmap_free_zero_pages(free);
 }
@@ -4479,11 +4487,11 @@ pmap_is_modified(vm_page_t m)
 	if ((m->oflags & VPO_BUSY) == 0 &&
 	    (m->aflags & PGA_WRITEABLE) == 0)
 		return (FALSE);
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	rv = pmap_is_modified_pvh(&m->md) ||
 	    ((m->flags & PG_FICTITIOUS) == 0 &&
 	    pmap_is_modified_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (rv);
 }
 
@@ -4500,7 +4508,7 @@ pmap_is_modified_pvh(struct md_page *pvh)
 	pmap_t pmap;
 	boolean_t rv;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	rv = FALSE;
 	sched_pin();
 	TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
@@ -4553,11 +4561,11 @@ pmap_is_referenced(vm_page_t m)
 
 	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
 	    ("pmap_is_referenced: page %p is not managed", m));
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	rv = pmap_is_referenced_pvh(&m->md) ||
 	    ((m->flags & PG_FICTITIOUS) == 0 &&
 	    pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (rv);
 }
 
@@ -4573,7 +4581,7 @@ pmap_is_referenced_pvh(struct md_page *pvh)
 	pmap_t pmap;
 	boolean_t rv;
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	rw_assert(&pvh_global_lock, RA_WLOCKED);
 	rv = FALSE;
 	sched_pin();
 	TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
@@ -4614,7 +4622,7 @@ pmap_remove_write(vm_page_t m)
 	if ((m->oflags & VPO_BUSY) == 0 &&
 	    (m->aflags & PGA_WRITEABLE) == 0)
 		return;
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	if ((m->flags & PG_FICTITIOUS) != 0)
 		goto small_mappings;
@@ -4655,7 +4663,7 @@ retry:
 	}
 	vm_page_aflag_clear(m, PGA_WRITEABLE);
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 }
 
 /*
@@ -4684,7 +4692,7 @@ pmap_ts_referenced(vm_page_t m)
 	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
 	    ("pmap_ts_referenced: page %p is not managed", m));
 	pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	if ((m->flags & PG_FICTITIOUS) != 0)
 		goto small_mappings;
@@ -4743,7 +4751,7 @@ small_mappings:
 	}
 out:
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 	return (rtval);
 }
 
@@ -4773,7 +4781,7 @@ pmap_clear_modify(vm_page_t m)
 	 */
 	if ((m->aflags & PGA_WRITEABLE) == 0)
 		return;
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	if ((m->flags & PG_FICTITIOUS) != 0)
 		goto small_mappings;
@@ -4834,7 +4842,7 @@ small_mappings:
 		PMAP_UNLOCK(pmap);
 	}
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 }
 
 /*
@@ -4854,7 +4862,7 @@ pmap_clear_reference(vm_page_t m)
 
 	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
 	    ("pmap_clear_reference: page %p is not managed", m));
-	vm_page_lock_queues();
+	rw_wlock(&pvh_global_lock);
 	sched_pin();
 	if ((m->flags & PG_FICTITIOUS) != 0)
 		goto small_mappings;
@@ -4901,7 +4909,7 @@ small_mappings:
 		PMAP_UNLOCK(pmap);
 	}
 	sched_unpin();
-	vm_page_unlock_queues();
+	rw_wunlock(&pvh_global_lock);
 }
 
 /*