D5747.id15971.diff
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	Index: sys/amd64/amd64/pmap.c
	===================================================================
	--- sys/amd64/amd64/pmap.c
	+++ sys/amd64/amd64/pmap.c
	@@ -375,8 +375,6 @@
	} pmap_preinit_mapping[PMAP_PREINIT_MAPPING_COUNT];
	static int pmap_initialized;

	-static struct rwlock_padalign pvh_global_lock;
	-
	/*
	* Data for the pv entry allocation mechanism
	*/
	@@ -418,6 +416,127 @@
	CTLFLAG_MPSAFE, NULL, 0, pmap_pcid_save_cnt_proc, "QU",
	"Count of saved TLB context on switch");

	+static LIST_HEAD(, pmap_invl_gen) pmap_invl_gen_tracker =
	+ LIST_HEAD_INITIALIZER(&pmap_invl_gen_tracker);
	+static struct mtx invl_gen_mtx;
	+static u_long pmap_invl_gen = 0;
	+
	+/*
	+ * Start a new Delayed Invalidation (DI) block of code, executed by
	+ * the current thread. The DI block is the code sequence which may
	+ * modify (remove) a PTE mapping some page and modify PV list for the
	+ * page, before ensuring that TLBs on all processors were consistently
	+ * cleared from that PTE, but unlocking PV lock.
	+ */
	+static void
	+pmap_delayed_invl_started(void)
	+{
	+ struct pmap_invl_gen *invl_gen;
	+ u_long currgen;
	+
	+ invl_gen = &curthread->td_md.md_invl_gen;
	+ KASSERT(invl_gen->gen == 0, ("recursed invl_gen"));
	+ mtx_lock(&invl_gen_mtx);
	+ if (LIST_EMPTY(&pmap_invl_gen_tracker))
	+ currgen = pmap_invl_gen;
	+ else
	+ currgen = LIST_FIRST(&pmap_invl_gen_tracker)->gen;
	+ invl_gen->gen = currgen + 1;
	+ LIST_INSERT_HEAD(&pmap_invl_gen_tracker, invl_gen, link);
	+ mtx_unlock(&invl_gen_mtx);
	+}
	+
	+/*
	+ * Finish the DI block, previously started by the current thread. All
	+ * required TLB flushes for the pages marked by pmap_delayed_invl_page()
	+ * must be finished when the block is finished. No other CPU must be able
	+ * to access the removed mapping for the participating pages.
	+ *
	+ * The function works by bumping the DI global generation count to the
	+ * current thread generation count, unless some thread beyond current
	+ * have gen count higher. In the later case, the bump is postponed to
	+ * the thread beyond.
	+ */
	+static void
	+pmap_delayed_invl_finished(void)
	+{
	+ struct pmap_invl_gen invl_gen, next;
	+
	+ invl_gen = &curthread->td_md.md_invl_gen;
	+ KASSERT(invl_gen->gen != 0, ("missed invl_started"));
	+ mtx_lock(&invl_gen_mtx);
	+ next = LIST_NEXT(invl_gen, link);
	+ if (next == NULL)
	+ atomic_store_rel_long(&pmap_invl_gen, invl_gen->gen);
	+ else
	+ next->gen = invl_gen->gen;
	+ LIST_REMOVE(invl_gen, link);
	+ mtx_unlock(&invl_gen_mtx);
	+ invl_gen->gen = 0;
	+}
	+
	+#ifdef INVARIANTS
	+static long invl_wait;
	+SYSCTL_LONG(_vm_pmap, OID_AUTO, invl_wait, CTLFLAG_RD, &invl_wait, 0,
	+ "");
	+#endif
	+
	+/*
	+ * The pmap_delayed_invl_wait() function ensures that all currently
	+ * executing DI blocks, which need to flush TLB for the given page m,
	+ * actually flushed the TLB at the time the function returned. If the
	+ * page m has empty PV list and we called pmap_delayed_invl_wait(), we
	+ * know that no CPU has a valid mapping for the page m, neither in the
	+ * active page table, nor cached in TLB.
	+ *
	+ * The function works by spinning until the current global
	+ * invalidation generation is bumped beyond the page generation by the
	+ * threads leaving DI blocks.
	+ */
	+static void
	+pmap_delayed_invl_wait(vm_page_t m)
	+{
	+#ifdef INVARIANTS
	+ boolean_t accounted = FALSE;
	+#endif
	+
	+ while ((u_long)atomic_load_acq_long(&m->md.invl_gen) >
	+ (u_long)atomic_load_acq_long(&pmap_invl_gen)) {
	+#ifdef INVARIANTS
	+ if (!accounted) {
	+ atomic_add_long(&invl_wait, 1);
	+ accounted = TRUE;
	+ }
	+#endif
	+ kern_yield(PRI_USER); /* XXX */
	+ }
	+}
	+
	+/*
	+ * Mark the given page m as participating in the current thread DI
	+ * block. Waiter for the page DI invalidation which noted current
	+ * block, is not allowed to execute until the block finishes.
	+ *
	+ * The function works by setting invalidation generational count for
	+ * the page to at least the gen count for the current page. This
	+ * forces a caller to pmap_delayed_invl_wait() to spin until current
	+ * thread called pmap_delayed_invl_finished().
	+ */
	+static void
	+pmap_delayed_invl_page(vm_page_t m)
	+{
	+ u_long old_gen, gen;
	+
	+ gen = curthread->td_md.md_invl_gen.gen;
	+ if (gen == 0)
	+ return;
	+ do {
	+ old_gen = m->md.invl_gen;
	+ if (old_gen >= gen)
	+ break;
	+ } while (!atomic_cmpset_rel_long(&m->md.invl_gen, old_gen, gen));
	+}
	+
	/*
	* Crashdump maps.
	*/
	@@ -886,9 +1005,9 @@
	kernel_pmap->pm_flags = pmap_flags;

	/*
	- * Initialize the global pv list lock.
	+ * Initialize the TLB invalidations generation number lock.
	*/
	- rw_init(&pvh_global_lock, "pmap pv global");
	+ mtx_init(&invl_gen_mtx, "invlgn", NULL, MTX_DEF);

	/*
	* Reserve some special page table entries/VA space for temporary
	@@ -2313,9 +2432,7 @@
	if (lockp != NULL) {
	RELEASE_PV_LIST_LOCK(lockp);
	PMAP_UNLOCK(pmap);
	- rw_runlock(&pvh_global_lock);
	VM_WAIT;
	- rw_rlock(&pvh_global_lock);
	PMAP_LOCK(pmap);
	}

	@@ -2719,7 +2836,6 @@
	uint64_t inuse;
	int bit, field, freed;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED);
	KASSERT(lockp != NULL, ("reclaim_pv_chunk: lockp is NULL"));
	pmap = NULL;
	@@ -2727,6 +2843,7 @@
	PG_G = PG_A = PG_M = PG_RW = 0;
	SLIST_INIT(&free);
	TAILQ_INIT(&new_tail);
	+ pmap_delayed_invl_started();
	mtx_lock(&pv_chunks_mutex);
	while ((pc = TAILQ_FIRST(&pv_chunks)) != NULL && SLIST_EMPTY(&free)) {
	TAILQ_REMOVE(&pv_chunks, pc, pc_lru);
	@@ -2737,6 +2854,8 @@
	if (pmap != locked_pmap)
	PMAP_UNLOCK(pmap);
	}
	+ pmap_delayed_invl_finished();
	+ pmap_delayed_invl_started();
	pmap = pc->pc_pmap;
	/* Avoid deadlock and lock recursion. */
	if (pmap > locked_pmap) {
	@@ -2790,6 +2909,7 @@
	PGA_WRITEABLE);
	}
	}
	+ pmap_delayed_invl_page(m);
	pc->pc_map[field] \|= 1UL << bit;
	pmap_unuse_pt(pmap, va, *pde, &free);
	freed++;
	@@ -2831,6 +2951,7 @@
	if (pmap != locked_pmap)
	PMAP_UNLOCK(pmap);
	}
	+ pmap_delayed_invl_finished();
	if (m_pc == NULL && !SLIST_EMPTY(&free)) {
	m_pc = SLIST_FIRST(&free);
	SLIST_REMOVE_HEAD(&free, plinks.s.ss);
	@@ -2851,7 +2972,6 @@
	struct pv_chunk *pc;
	int idx, field, bit;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	PV_STAT(atomic_add_long(&pv_entry_frees, 1));
	PV_STAT(atomic_add_int(&pv_entry_spare, 1));
	@@ -2908,7 +3028,6 @@
	struct pv_chunk *pc;
	vm_page_t m;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	PV_STAT(atomic_add_long(&pv_entry_allocs, 1));
	retry:
	@@ -3004,7 +3123,6 @@
	int avail, free;
	vm_page_t m;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	KASSERT(lockp != NULL, ("reserve_pv_entries: lockp is NULL"));

	@@ -3074,7 +3192,6 @@
	{
	pv_entry_t pv;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	TAILQ_FOREACH(pv, &pvh->pv_list, pv_next) {
	if (pmap == PV_PMAP(pv) && va == pv->pv_va) {
	TAILQ_REMOVE(&pvh->pv_list, pv, pv_next);
	@@ -3101,7 +3218,6 @@
	vm_page_t m;
	int bit, field;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	KASSERT((pa & PDRMASK) == 0,
	("pmap_pv_demote_pde: pa is not 2mpage aligned"));
	@@ -3168,7 +3284,6 @@
	vm_offset_t va_last;
	vm_page_t m;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	KASSERT((pa & PDRMASK) == 0,
	("pmap_pv_promote_pde: pa is not 2mpage aligned"));
	CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa);
	@@ -3221,7 +3336,6 @@
	{
	pv_entry_t pv;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	/* Pass NULL instead of the lock pointer to disable reclamation. */
	if ((pv = get_pv_entry(pmap, NULL)) != NULL) {
	@@ -3245,7 +3359,6 @@
	struct md_page *pvh;
	pv_entry_t pv;

	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
	/* Pass NULL instead of the lock pointer to disable reclamation. */
	if ((pv = get_pv_entry(pmap, NULL)) != NULL) {
	@@ -3503,6 +3616,7 @@
	if (TAILQ_EMPTY(&m->md.pv_list) &&
	TAILQ_EMPTY(&pvh->pv_list))
	vm_page_aflag_clear(m, PGA_WRITEABLE);
	+ pmap_delayed_invl_page(m);
	}
	}
	if (pmap == kernel_pmap) {
	@@ -3556,6 +3670,7 @@
	if (TAILQ_EMPTY(&pvh->pv_list))
	vm_page_aflag_clear(m, PGA_WRITEABLE);
	}
	+ pmap_delayed_invl_page(m);
	}
	return (pmap_unuse_pt(pmap, va, ptepde, free));
	}
	@@ -3614,7 +3729,7 @@
	anyvalid = 0;
	SLIST_INIT(&free);

	- rw_rlock(&pvh_global_lock);
	+ pmap_delayed_invl_started();
	PMAP_LOCK(pmap);

	/*
	@@ -3729,8 +3844,8 @@
	out:
	if (anyvalid)
	pmap_invalidate_all(pmap);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	+ pmap_delayed_invl_finished();
	pmap_free_zero_pages(&free);
	}

	@@ -3753,30 +3868,55 @@
	struct md_page *pvh;
	pv_entry_t pv;
	pmap_t pmap;
	+ struct rwlock *lock;
	pt_entry_t *pte, tpte, PG_A, PG_M, PG_RW;
	pd_entry_t *pde;
	vm_offset_t va;
	struct spglist free;
	+ int pvh_gen, md_gen;

	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
	("pmap_remove_all: page %p is not managed", m));
	SLIST_INIT(&free);
	- rw_wlock(&pvh_global_lock);
	+ lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	+ pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
	+retry:
	+ rw_wlock(lock);
	if ((m->flags & PG_FICTITIOUS) != 0)
	goto small_mappings;
	- pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
	while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) {
	pmap = PV_PMAP(pv);
	- PMAP_LOCK(pmap);
	+ if (!PMAP_TRYLOCK(pmap)) {
	+ pvh_gen = pvh->pv_gen;
	+ rw_wunlock(lock);
	+ PMAP_LOCK(pmap);
	+ rw_wlock(lock);
	+ if (pvh_gen != pvh->pv_gen) {
	+ rw_wunlock(lock);
	+ PMAP_UNLOCK(pmap);
	+ goto retry;
	+ }
	+ }
	va = pv->pv_va;
	pde = pmap_pde(pmap, va);
	- (void)pmap_demote_pde(pmap, pde, va);
	+ (void)pmap_demote_pde_locked(pmap, pde, va, &lock);
	PMAP_UNLOCK(pmap);
	}
	small_mappings:
	while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
	pmap = PV_PMAP(pv);
	- PMAP_LOCK(pmap);
	+ if (!PMAP_TRYLOCK(pmap)) {
	+ pvh_gen = pvh->pv_gen;
	+ md_gen = m->md.pv_gen;
	+ rw_wunlock(lock);
	+ PMAP_LOCK(pmap);
	+ rw_wlock(lock);
	+ if (pvh_gen != pvh->pv_gen \|\| md_gen != m->md.pv_gen) {
	+ rw_wunlock(lock);
	+ PMAP_UNLOCK(pmap);
	+ goto retry;
	+ }
	+ }
	PG_A = pmap_accessed_bit(pmap);
	PG_M = pmap_modified_bit(pmap);
	PG_RW = pmap_rw_bit(pmap);
	@@ -3804,7 +3944,8 @@
	PMAP_UNLOCK(pmap);
	}
	vm_page_aflag_clear(m, PGA_WRITEABLE);
	- rw_wunlock(&pvh_global_lock);
	+ rw_wunlock(lock);
	+ pmap_delayed_invl_wait(m);
	pmap_free_zero_pages(&free);
	}

	@@ -3864,7 +4005,7 @@
	pdp_entry_t *pdpe;
	pd_entry_t ptpaddr, *pde;
	pt_entry_t *pte, PG_G, PG_M, PG_RW, PG_V;
	- boolean_t anychanged, pv_lists_locked;
	+ boolean_t anychanged;

	KASSERT((prot & ~VM_PROT_ALL) == 0, ("invalid prot %x", prot));
	if (prot == VM_PROT_NONE) {
	@@ -3880,8 +4021,6 @@
	PG_M = pmap_modified_bit(pmap);
	PG_V = pmap_valid_bit(pmap);
	PG_RW = pmap_rw_bit(pmap);
	- pv_lists_locked = FALSE;
	-resume:
	anychanged = FALSE;

	PMAP_LOCK(pmap);
	@@ -3932,25 +4071,11 @@
	if (pmap_protect_pde(pmap, pde, sva, prot))
	anychanged = TRUE;
	continue;
	- } else {
	- if (!pv_lists_locked) {
	- pv_lists_locked = TRUE;
	- if (!rw_try_rlock(&pvh_global_lock)) {
	- if (anychanged)
	- pmap_invalidate_all(
	- pmap);
	- PMAP_UNLOCK(pmap);
	- rw_rlock(&pvh_global_lock);
	- goto resume;
	- }
	- }
	- if (!pmap_demote_pde(pmap, pde, sva)) {
	- /*
	- * The large page mapping was
	- * destroyed.
	- */
	- continue;
	- }
	+ } else if (!pmap_demote_pde(pmap, pde, sva)) {
	+ /*
	+ * The large page mapping was destroyed.
	+ */
	+ continue;
	}
	}

	@@ -3990,8 +4115,6 @@
	}
	if (anychanged)
	pmap_invalidate_all(pmap);
	- if (pv_lists_locked)
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	}

	@@ -4135,6 +4258,11 @@
	* NB: This is the only routine which MAY NOT lazy-evaluate
	* or lose information. That is, this routine must actually
	* insert this page into the given map NOW.
	+ *
	+ * In each case when destroing a mapping, and its PV entry, and
	+ * requires a TLB invalidation, the function does the TLB
	+ * invalidation before releasing the PV list lock, so we do not
	+ * need pmap_delayed_invl_page() calls there.
	*/
	int
	pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
	@@ -4196,7 +4324,6 @@
	mpte = NULL;

	lock = NULL;
	- rw_rlock(&pvh_global_lock);
	PMAP_LOCK(pmap);

	/*
	@@ -4223,7 +4350,6 @@
	if (mpte == NULL && nosleep) {
	if (lock != NULL)
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	return (KERN_RESOURCE_SHORTAGE);
	}
	@@ -4356,7 +4482,6 @@

	if (lock != NULL)
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	return (KERN_SUCCESS);
	}
	@@ -4377,7 +4502,6 @@
	struct spglist free;

	PG_V = pmap_valid_bit(pmap);
	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);

	if ((mpde = pmap_allocpde(pmap, va, NULL)) == NULL) {
	@@ -4469,7 +4593,6 @@
	mpte = NULL;
	m = m_start;
	lock = NULL;
	- rw_rlock(&pvh_global_lock);
	PMAP_LOCK(pmap);
	while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
	va = start + ptoa(diff);
	@@ -4484,7 +4607,6 @@
	}
	if (lock != NULL)
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	}

	@@ -4503,12 +4625,10 @@
	struct rwlock *lock;

	lock = NULL;
	- rw_rlock(&pvh_global_lock);
	PMAP_LOCK(pmap);
	(void)pmap_enter_quick_locked(pmap, va, m, prot, NULL, &lock);
	if (lock != NULL)
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	}

	@@ -4524,7 +4644,6 @@
	(m->oflags & VPO_UNMANAGED) != 0,
	("pmap_enter_quick_locked: managed mapping within the clean submap"));
	PG_V = pmap_valid_bit(pmap);
	- rw_assert(&pvh_global_lock, RA_LOCKED);
	PMAP_LOCK_ASSERT(pmap, MA_OWNED);

	/*
	@@ -4741,8 +4860,11 @@
	* must have the wired attribute set. In contrast, invalid mappings
	* cannot have the wired attribute set, so they are ignored.
	*
	- * The wired attribute of the page table entry is not a hardware feature,
	- * so there is no need to invalidate any TLB entries.
	+ * The wired attribute of the page table entry is not a hardware
	+ * feature, so there is no need to invalidate any TLB entries.
	+ * Since pmap_demote_pde() for the wired entry must never fail,
	+ * pmap_delayed_invl_started()/finished() calls around the
	+ * function are not needed.
	*/
	void
	pmap_unwire(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
	@@ -4752,11 +4874,8 @@
	pdp_entry_t *pdpe;
	pd_entry_t *pde;
	pt_entry_t *pte, PG_V;
	- boolean_t pv_lists_locked;

	PG_V = pmap_valid_bit(pmap);
	- pv_lists_locked = FALSE;
	-resume:
	PMAP_LOCK(pmap);
	for (; sva < eva; sva = va_next) {
	pml4e = pmap_pml4e(pmap, sva);
	@@ -4794,15 +4913,6 @@
	PAGE_SIZE;
	continue;
	} else {
	- if (!pv_lists_locked) {
	- pv_lists_locked = TRUE;
	- if (!rw_try_rlock(&pvh_global_lock)) {
	- PMAP_UNLOCK(pmap);
	- rw_rlock(&pvh_global_lock);
	- /* Repeat sva. */
	- goto resume;
	- }
	- }
	if (!pmap_demote_pde(pmap, pde, sva))
	panic("pmap_unwire: demotion failed");
	}
	@@ -4826,8 +4936,6 @@
	pmap->pm_stats.wired_count--;
	}
	}
	- if (pv_lists_locked)
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	}

	@@ -4868,7 +4976,6 @@
	return;

	lock = NULL;
	- rw_rlock(&pvh_global_lock);
	if (dst_pmap < src_pmap) {
	PMAP_LOCK(dst_pmap);
	PMAP_LOCK(src_pmap);
	@@ -5003,7 +5110,6 @@
	out:
	if (lock != NULL)
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(src_pmap);
	PMAP_UNLOCK(dst_pmap);
	}
	@@ -5116,7 +5222,6 @@
	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
	("pmap_page_exists_quick: page %p is not managed", m));
	rv = FALSE;
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	rw_rlock(lock);
	TAILQ_FOREACH(pv, &m->md.pv_list, pv_next) {
	@@ -5141,7 +5246,6 @@
	}
	}
	rw_runlock(lock);
	- rw_runlock(&pvh_global_lock);
	return (rv);
	}

	@@ -5163,7 +5267,6 @@

	if ((m->oflags & VPO_UNMANAGED) != 0)
	return (0);
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	rw_rlock(lock);
	restart:
	@@ -5208,7 +5311,6 @@
	}
	}
	rw_runlock(lock);
	- rw_runlock(&pvh_global_lock);
	return (count);
	}

	@@ -5224,14 +5326,12 @@

	if ((m->oflags & VPO_UNMANAGED) != 0)
	return (FALSE);
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	rw_rlock(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));
	rw_runlock(lock);
	- rw_runlock(&pvh_global_lock);
	return (rv);
	}

	@@ -5294,7 +5394,6 @@
	PG_RW = pmap_rw_bit(pmap);

	SLIST_INIT(&free);
	- rw_rlock(&pvh_global_lock);
	PMAP_LOCK(pmap);
	TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) {
	allfree = 1;
	@@ -5427,7 +5526,6 @@
	if (lock != NULL)
	rw_wunlock(lock);
	pmap_invalidate_all(pmap);
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	pmap_free_zero_pages(&free);
	}
	@@ -5445,7 +5543,6 @@
	boolean_t rv;

	rv = FALSE;
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	rw_rlock(lock);
	restart:
	@@ -5514,7 +5611,6 @@
	}
	out:
	rw_runlock(lock);
	- rw_runlock(&pvh_global_lock);
	return (rv);
	}

	@@ -5608,7 +5704,6 @@
	VM_OBJECT_ASSERT_WLOCKED(m->object);
	if (!vm_page_xbusied(m) && (m->aflags & PGA_WRITEABLE) == 0)
	return;
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
	retry_pv_loop:
	@@ -5675,7 +5770,7 @@
	}
	rw_wunlock(lock);
	vm_page_aflag_clear(m, PGA_WRITEABLE);
	- rw_runlock(&pvh_global_lock);
	+ pmap_delayed_invl_wait(m);
	}

	static __inline boolean_t
	@@ -5736,12 +5831,12 @@

	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
	("pmap_ts_referenced: page %p is not managed", m));
	+ pmap_delayed_invl_started();
	SLIST_INIT(&free);
	cleared = 0;
	pa = VM_PAGE_TO_PHYS(m);
	lock = PHYS_TO_PV_LIST_LOCK(pa);
	pvh = pa_to_pvh(pa);
	- rw_rlock(&pvh_global_lock);
	rw_wlock(lock);
	retry:
	not_cleared = 0;
	@@ -5901,7 +5996,7 @@
	not_cleared < PMAP_TS_REFERENCED_MAX);
	out:
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	+ pmap_delayed_invl_finished();
	pmap_free_zero_pages(&free);
	return (cleared + not_cleared);
	}
	@@ -5921,10 +6016,11 @@
	pt_entry_t *pte, PG_A, PG_G, PG_M, PG_RW, PG_V;
	vm_offset_t va_next;
	vm_page_t m;
	- boolean_t anychanged, pv_lists_locked;
	+ boolean_t anychanged;

	if (advice != MADV_DONTNEED && advice != MADV_FREE)
	return;
	+ pmap_delayed_invl_started();

	/*
	* A/D bit emulation requires an alternate code path when clearing
	@@ -5940,9 +6036,6 @@
	PG_M = pmap_modified_bit(pmap);
	PG_V = pmap_valid_bit(pmap);
	PG_RW = pmap_rw_bit(pmap);
	-
	- pv_lists_locked = FALSE;
	-resume:
	anychanged = FALSE;
	PMAP_LOCK(pmap);
	for (; sva < eva; sva = va_next) {
	@@ -5970,16 +6063,6 @@
	else if ((oldpde & PG_PS) != 0) {
	if ((oldpde & PG_MANAGED) == 0)
	continue;
	- if (!pv_lists_locked) {
	- pv_lists_locked = TRUE;
	- if (!rw_try_rlock(&pvh_global_lock)) {
	- if (anychanged)
	- pmap_invalidate_all(pmap);
	- PMAP_UNLOCK(pmap);
	- rw_rlock(&pvh_global_lock);
	- goto resume;
	- }
	- }
	lock = NULL;
	if (!pmap_demote_pde_locked(pmap, pde, sva, &lock)) {
	if (lock != NULL)
	@@ -6039,9 +6122,8 @@
	}
	if (anychanged)
	pmap_invalidate_all(pmap);
	- if (pv_lists_locked)
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	+ pmap_delayed_invl_finished();
	}

	/*
	@@ -6073,7 +6155,6 @@
	if ((m->aflags & PGA_WRITEABLE) == 0)
	return;
	pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
	- rw_rlock(&pvh_global_lock);
	lock = VM_PAGE_TO_PV_LIST_LOCK(m);
	rw_wlock(lock);
	restart:
	@@ -6149,7 +6230,6 @@
	PMAP_UNLOCK(pmap);
	}
	rw_wunlock(lock);
	- rw_runlock(&pvh_global_lock);
	}

	/*
	@@ -6851,7 +6931,6 @@
	vm_page_t m, mpte;
	pd_entry_t *pde;
	pt_entry_t *pte, PG_A, PG_M, PG_RW, PG_V;
	- boolean_t pv_lists_locked;

	KASSERT(ftype == VM_PROT_READ \|\| ftype == VM_PROT_WRITE,
	("pmap_emulate_accessed_dirty: invalid fault type %d", ftype));
	@@ -6866,8 +6945,6 @@

	rv = -1;
	lock = NULL;
	- pv_lists_locked = FALSE;
	-retry:
	PMAP_LOCK(pmap);

	pde = pmap_pde(pmap, va);
	@@ -6918,14 +6995,6 @@
	pmap_ps_enabled(pmap) &&
	(m->flags & PG_FICTITIOUS) == 0 &&
	vm_reserv_level_iffullpop(m) == 0) {
	- if (!pv_lists_locked) {
	- pv_lists_locked = TRUE;
	- if (!rw_try_rlock(&pvh_global_lock)) {
	- PMAP_UNLOCK(pmap);
	- rw_rlock(&pvh_global_lock);
	- goto retry;
	- }
	- }
	pmap_promote_pde(pmap, pde, va, &lock);
	#ifdef INVARIANTS
	atomic_add_long(&ad_emulation_superpage_promotions, 1);
	@@ -6941,8 +7010,6 @@
	done:
	if (lock != NULL)
	rw_wunlock(lock);
	- if (pv_lists_locked)
	- rw_runlock(&pvh_global_lock);
	PMAP_UNLOCK(pmap);
	return (rv);
	}
	Index: sys/amd64/amd64/vm_machdep.c
	===================================================================
	--- sys/amd64/amd64/vm_machdep.c
	+++ sys/amd64/amd64/vm_machdep.c
	@@ -236,6 +236,7 @@
	/* Setup to release spin count in fork_exit(). */
	td2->td_md.md_spinlock_count = 1;
	td2->td_md.md_saved_flags = PSL_KERNEL \| PSL_I;
	+ td2->td_md.md_invl_gen.gen = 0;

	/* As an i386, do not copy io permission bitmap. */
	pcb2->pcb_tssp = NULL;
	Index: sys/amd64/include/pmap.h
	===================================================================
	--- sys/amd64/include/pmap.h
	+++ sys/amd64/include/pmap.h
	@@ -288,6 +288,7 @@
	TAILQ_HEAD(,pv_entry) pv_list;
	int pv_gen;
	int pat_mode;
	+ u_long invl_gen; /* long to avoid wraparounds */
	};

	enum pmap_type {
	Index: sys/amd64/include/proc.h
	===================================================================
	--- sys/amd64/include/proc.h
	+++ sys/amd64/include/proc.h
	@@ -33,6 +33,7 @@
	#ifndef _MACHINE_PROC_H_
	#define _MACHINE_PROC_H_

	+#include <sys/queue.h>
	#include <machine/segments.h>

	struct proc_ldt {
	@@ -40,6 +41,11 @@
	int ldt_refcnt;
	};

	+struct pmap_invl_gen {
	+ u_long gen;
	+ LIST_ENTRY(pmap_invl_gen) link;
	+};
	+
	/*
	* Machine-dependent part of the proc structure for AMD64.
	*/
	@@ -47,6 +53,7 @@
	int md_spinlock_count; /* (k) */
	register_t md_saved_flags; /* (k) */
	register_t md_spurflt_addr; /* (k) Spurious page fault address. */
	+ struct pmap_invl_gen md_invl_gen; /* (k) */
	};

	struct mdproc {

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