Function vmem_rehash

freebsd/kern/subr_vmem.c:729–768

/* ---- rehash */

static int
vmem_rehash(vmem_t *vm, vmem_size_t newhashsize)
{
	bt_t *bt;
	struct vmem_hashlist *newhashlist;
	struct vmem_hashlist *oldhashlist;
	vmem_size_t i, oldhashsize;

	MPASS(newhashsize > 0);

	newhashlist = malloc(sizeof(struct vmem_hashlist) * newhashsize,
	    M_VMEM, M_NOWAIT);
	if (newhashlist == NULL)
		return ENOMEM;
	for (i = 0; i < newhashsize; i++) {
		LIST_INIT(&newhashlist[i]);
	}

	VMEM_LOCK(vm);
	oldhashlist = vm->vm_hashlist;
	oldhashsize = vm->vm_hashsize;
	vm->vm_hashlist = newhashlist;
	vm->vm_hashsize = newhashsize;
	if (oldhashlist == NULL) {
		VMEM_UNLOCK(vm);
		return 0;
	}
	for (i = 0; i < oldhashsize; i++) {
		while ((bt = LIST_FIRST(&oldhashlist[i])) != NULL) {
			bt_rembusy(vm, bt);
			bt_insbusy(vm, bt);
		}
	}
	VMEM_UNLOCK(vm);

	if (oldhashlist != vm->vm_hash0)
		free(oldhashlist, M_VMEM);

	return 0;
}

static void
vmem_periodic_kick(void *dummy)