D44575.id136651.diff
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D44575.id136651.diff
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	diff --git a/sys/vm/vm_reserv.h b/sys/vm/vm_reserv.h
	--- a/sys/vm/vm_reserv.h
	+++ b/sys/vm/vm_reserv.h
	@@ -55,6 +55,7 @@
	boolean_t vm_reserv_free_page(vm_page_t m);
	void vm_reserv_init(void);
	bool vm_reserv_is_page_free(vm_page_t m);
	+bool vm_reserv_is_populated(vm_page_t m, int npages);
	int vm_reserv_level(vm_page_t m);
	int vm_reserv_level_iffullpop(vm_page_t m);
	vm_page_t vm_reserv_reclaim_contig(int domain, u_long npages,
	diff --git a/sys/vm/vm_reserv.c b/sys/vm/vm_reserv.c
	--- a/sys/vm/vm_reserv.c
	+++ b/sys/vm/vm_reserv.c
	@@ -1058,6 +1058,27 @@
	return (!bit_test(rv->popmap, m - rv->pages));
	}

	+/*
	+ * Returns true if the given page is part of a block of npages, starting at a
	+ * multiple of npages, that are all allocated. Otherwise, returns false.
	+ */
	+bool
	+vm_reserv_is_populated(vm_page_t m, int npages)
	+{
	+ vm_reserv_t rv;
	+ int index;
	+
	+ KASSERT(npages <= VM_LEVEL_0_NPAGES,
	+ ("%s: npages %d exceeds VM_LEVEL_0_NPAGES", __func__, npages));
	+ KASSERT(powerof2(npages),
	+ ("%s: npages %d is not a power of 2", __func__, npages));
	+ rv = vm_reserv_from_page(m);
	+ if (rv->object == NULL)
	+ return (false);
	+ index = rounddown2(m - rv->pages, npages);
	+ return (bit_ntest(rv->popmap, index, index + npages - 1, 1));
	+}
	+
	/*
	* If the given page belongs to a reservation, returns the level of that
	* reservation. Otherwise, returns -1.