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diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -618,6 +618,8 @@
vm_pindex_t pindex, int domain, int req, u_long npages, vm_paddr_t low,
vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
vm_memattr_t memattr);
+int vm_page_alloc_pages(vm_object_t object, vm_pindex_t pindex, vm_page_t *ma,
+ int npages, int req, struct pctrie_iter *it);
vm_page_t vm_page_alloc_noobj(int);
vm_page_t vm_page_alloc_noobj_domain(int, int);
vm_page_t vm_page_alloc_noobj_contig(int req, u_long npages, vm_paddr_t low,
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2147,6 +2147,242 @@
return (m);
}
+static void
+vm_page_alloc_init_page(vm_object_t object, vm_page_t m, int flags, int req)
+{
+ vm_page_dequeue(m);
+ vm_page_alloc_check(m);
+
+ /*
+ * Initialize the page. Only the PG_ZERO flag is inherited.
+ */
+ flags |= m->flags & PG_ZERO;
+ if ((req & VM_ALLOC_NODUMP) != 0)
+ flags |= PG_NODUMP;
+ m->flags = flags;
+ m->a.flags = 0;
+ m->oflags = (object->flags & OBJ_UNMANAGED) != 0 ? VPO_UNMANAGED : 0;
+ if ((req & (VM_ALLOC_NOBUSY | VM_ALLOC_SBUSY)) == 0)
+ m->busy_lock = VPB_CURTHREAD_EXCLUSIVE;
+ else if ((req & VM_ALLOC_SBUSY) != 0)
+ m->busy_lock = VPB_SHARERS_WORD(1);
+ else
+ m->busy_lock = VPB_UNBUSIED;
+ if (req & VM_ALLOC_WIRED) {
+ vm_wire_add(1);
+ m->ref_count = 1;
+ }
+ m->a.act_count = 0;
+
+ /* Ignore device objects; the pager sets "memattr" for them. */
+ if (object->memattr != VM_MEMATTR_DEFAULT &&
+ (object->flags & OBJ_FICTITIOUS) == 0)
+ pmap_page_set_memattr(m, object->memattr);
+}
+
+static void __always_inline
+vm_page_alloc_pages_init(vm_page_t m, vm_object_t object,
+ int req)
+{
+ int flags;
+
+ flags = 0;
+ flags |= m->flags & PG_PCPU_CACHE;
+ vm_page_alloc_init_page(object, m, flags,
+ req);
+ m->object = object;
+ m->ref_count |= VPRC_OBJREF;
+}
+
+static int
+vm_page_alloc_pages_domain(vm_object_t object, vm_pindex_t pindex,
+ vm_page_t *ma, int npages, int req,
+ int domain, vm_page_t mpred, struct pctrie_iter *it)
+{
+ int got, rv;
+ int i;
+ vm_page_t m;
+ struct vm_domain *vmd;
+
+#define VPAP_FLAGS \
+ (VM_ALLOC_CLASS_MASK | VM_ALLOC_WAITFAIL | VM_ALLOC_NOWAIT | \
+ VM_ALLOC_NOBUSY | VM_ALLOC_SBUSY | VM_ALLOC_WIRED | \
+ VM_ALLOC_NODUMP | VM_ALLOC_ZERO)
+
+ KASSERT((req & ~VPAP_FLAGS) == 0,
+ ("invalid request %#x", req));
+ KASSERT(((req & (VM_ALLOC_NOBUSY | VM_ALLOC_SBUSY)) !=
+ (VM_ALLOC_NOBUSY | VM_ALLOC_SBUSY)),
+ ("invalid request %#x", req));
+ KASSERT(mpred == NULL || mpred->pindex < pindex,
+ ("mpred %p doesn't precede pindex 0x%jx", mpred,
+ (uintmax_t)pindex));
+ KASSERT(npages > 0,
+ ("%s: npages is negative: %d", __func__,
+ npages));
+ VM_OBJECT_ASSERT_WLOCKED(object);
+
+ got = 0;
+ vmd = VM_DOMAIN(domain);
+again:
+#if VM_NRESERVLEVEL > 0
+ if (vm_object_reserv(object)) {
+ while (got < npages) {
+ rv = vm_reserv_alloc_npages(object, pindex + got,
+ domain, mpred, req, &ma[got], npages - got);
+ if (rv == 0)
+ break;
+ got += rv;
+ }
+ }
+#endif
+ /*
+ * Fall back to the per-domain pagecache.
+ */
+ if (got < npages &&
+ vmd->vmd_pgcache[VM_FREEPOOL_DEFAULT].zone != NULL) {
+ while (got < npages) {
+ m = uma_zalloc(
+ vmd->vmd_pgcache[VM_FREEPOOL_DEFAULT].zone,
+ M_NOWAIT | M_NOVM);
+ if (m != NULL) {
+ m->flags |= PG_PCPU_CACHE;
+ ma[got++] = m;
+ continue;
+ }
+ break;
+ }
+ }
+
+ /*
+ * vm_phys_alloc_npages can only handle
+ * (1 << NFREEORDER-1) pages at a time.
+ */
+ if (got < npages && vm_domain_allocate(vmd, req, (npages - got))) {
+ while (got < npages) {
+ vm_domain_free_lock(vmd);
+ rv = vm_phys_alloc_npages(domain, VM_FREEPOOL_DEFAULT,
+ min(npages - got, 1 << (VM_NFREEORDER - 1)),
+ &ma[got]);
+ vm_domain_free_unlock(vmd);
+ if (rv == 0)
+ break;
+ got += rv;
+ }
+ if (got < npages)
+ vm_domain_freecnt_inc(vmd, npages - got);
+ }
+
+ if (got == 0) {
+#if VM_NRESERVLEVEL > 0
+ if (vm_reserv_reclaim_inactive(domain))
+ goto again;
+#endif
+ return (0);
+ }
+
+ /*
+ * Initialize and pre-link all pages into the memq.
+ */
+ m = ma[0];
+ vm_page_alloc_pages_init(m, object, req);
+ if (mpred != NULL) {
+ KASSERT(mpred->object == object,
+ ("%s: object doesn't contain mpred", __func__));
+ KASSERT(mpred->pindex < pindex,
+ ("%s: first page in array doesn't precede pindex",
+ __func__));
+ KASSERT(TAILQ_NEXT(mpred, listq) == NULL ||
+ pindex < TAILQ_NEXT(mpred, listq)->pindex,
+ ("%s: pindex doesn't precede msucc", __func__));
+ } else {
+ KASSERT(TAILQ_EMPTY(&object->memq) ||
+ pindex < TAILQ_FIRST(&object->memq)->pindex,
+ ("%s: no mpred but not first page", __func__));
+ }
+ if (__predict_true(mpred != NULL)) {
+ TAILQ_INSERT_AFTER(&object->memq, mpred, m, listq);
+ } else {
+ TAILQ_INSERT_HEAD(&object->memq, m, listq);
+ }
+ for (i = 1; i < got; i++) {
+ m = ma[i];
+ vm_page_alloc_pages_init(m, object, req);
+ TAILQ_INSERT_AFTER(&object->memq, ma[i - 1], m, listq);
+ }
+
+ rv = vm_page_insert_batch(object, it, ma, pindex, got);
+ KASSERT(rv >= 0,
+ ("%s: vm_page_insert_batch: negative return value %d\n",
+ __func__, rv));
+ if (rv < got) {
+
+ /*
+ * Not all pages were inserted - release
+ * the ones that didn't make it into
+ * the radix tree.
+ */
+ if (req & VM_ALLOC_WIRED)
+ vm_wire_sub(got - rv);
+ for (i = rv; i < got; i++) {
+ m = ma[i];
+ if (req & VM_ALLOC_WIRED) {
+ m->ref_count = 0;
+ }
+ TAILQ_REMOVE(&object->memq, m, listq);
+ m->object = NULL;
+ m->pindex = 0;
+ m->ref_count &= ~VPRC_OBJREF;
+ m->oflags = VPO_UNMANAGED;
+ m->busy_lock = VPB_UNBUSIED;
+ vm_page_free_toq(m);
+ }
+ got = rv;
+ }
+
+ return (got);
+}
+
+/*
+ * vm_page_alloc_pages:
+ *
+ * Attempt to allocate 'npages' pages and insert them into the object starting
+ * from the specified offset. By default, all pages are exclusive busied.
+ *
+ * Returns the number of allocated pages.
+ * The number of allocated pages may differ from 'nitems' if
+ * VM_ALLOC_NOWAIT was specified.
+ *
+ * The caller must always specify an allocation class.
+ */
+int
+vm_page_alloc_pages(vm_object_t object, vm_pindex_t pindex, vm_page_t *ma,
+ int npages, int req, struct pctrie_iter *it)
+{
+ struct vm_domainset_batch_iter dbi;
+ int domain, batch_npages;
+ vm_page_t mpred;
+ int got;
+
+ VM_OBJECT_ASSERT_WLOCKED(object);
+ vm_domainset_batch_iter_page_init(&dbi, object, pindex, npages,
+ &domain, &batch_npages, &req);
+ got = 0;
+ do {
+ mpred = vm_radix_iter_lookup_le(it, pindex + got);
+ if (got + batch_npages > npages) {
+ batch_npages = npages - got;
+ }
+ got += vm_page_alloc_pages_domain(object, pindex + got,
+ &ma[got], batch_npages, req, domain, mpred, it);
+ if (got == npages)
+ break;
+ } while (vm_domainset_batch_iter_page(&dbi, object, pindex + got,
+ &domain, &batch_npages) == 0);
+
+ return (got);
+}
+
/*
* Returns true if the number of free pages exceeds the minimum
* for the request class and false otherwise.

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