C++ (Cpp) VMEM_EVCNT_INCR Examples

Example #1

static int
bt_refill(vmem_t *vm, vm_flag_t flags)
{
	bt_t *bt;

	VMEM_LOCK(vm);
	if (vm->vm_nfreetags > BT_MINRESERVE) {
		VMEM_UNLOCK(vm);
		return 0;
	}

	mutex_enter(&vmem_btag_lock);
	while (!LIST_EMPTY(&vmem_btag_freelist) &&
	    vm->vm_nfreetags <= BT_MINRESERVE) {
		bt = LIST_FIRST(&vmem_btag_freelist);
		LIST_REMOVE(bt, bt_freelist);
		LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
		vm->vm_nfreetags++;
		vmem_btag_freelist_count--;
		VMEM_EVCNT_INCR(static_bt_inuse);
	}
	mutex_exit(&vmem_btag_lock);

	while (vm->vm_nfreetags <= BT_MINRESERVE) {
		VMEM_UNLOCK(vm);
		mutex_enter(&vmem_btag_refill_lock);
		bt = pool_get(&vmem_btag_pool,
		    (flags & VM_SLEEP) ? PR_WAITOK: PR_NOWAIT);
		mutex_exit(&vmem_btag_refill_lock);
		VMEM_LOCK(vm);
		if (bt == NULL && (flags & VM_SLEEP) == 0)
			break;
		LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
		vm->vm_nfreetags++;
	}

	VMEM_UNLOCK(vm);

	if (vm->vm_nfreetags == 0) {
		return ENOMEM;
	}


	if (kmem_meta_arena != NULL) {
		bt_refill(kmem_arena, (flags & ~VM_FITMASK)
		    | VM_INSTANTFIT | VM_POPULATING);
		bt_refill(kmem_va_meta_arena, (flags & ~VM_FITMASK)
		    | VM_INSTANTFIT | VM_POPULATING);
		bt_refill(kmem_meta_arena, (flags & ~VM_FITMASK)
		    | VM_INSTANTFIT | VM_POPULATING);
	}

	return 0;
}

Example #2

File: subr_vmem.c Project: ryo/netbsd-src

static int
bt_refill(vmem_t *vm)
{
	bt_t *bt;

	VMEM_LOCK(vm);
	if (vm->vm_nfreetags > BT_MINRESERVE) {
		VMEM_UNLOCK(vm);
		return 0;
	}

	mutex_enter(&vmem_btag_lock);
	while (!LIST_EMPTY(&vmem_btag_freelist) &&
	    vm->vm_nfreetags <= BT_MINRESERVE) {
		bt = LIST_FIRST(&vmem_btag_freelist);
		LIST_REMOVE(bt, bt_freelist);
		LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
		vm->vm_nfreetags++;
		vmem_btag_freelist_count--;
		VMEM_EVCNT_INCR(static_bt_inuse);
	}
	mutex_exit(&vmem_btag_lock);

	while (vm->vm_nfreetags <= BT_MINRESERVE) {
		VMEM_UNLOCK(vm);
		mutex_enter(&vmem_btag_refill_lock);
		bt = pool_get(&vmem_btag_pool, PR_NOWAIT);
		mutex_exit(&vmem_btag_refill_lock);
		VMEM_LOCK(vm);
		if (bt == NULL)
			break;
		LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
		vm->vm_nfreetags++;
	}

	if (vm->vm_nfreetags <= BT_MINRESERVE) {
		VMEM_UNLOCK(vm);
		return ENOMEM;
	}

	VMEM_UNLOCK(vm);

	if (kmem_meta_arena != NULL) {
		(void)bt_refill(kmem_arena);
		(void)bt_refill(kmem_va_meta_arena);
		(void)bt_refill(kmem_meta_arena);
	}

	return 0;
}

Example #3

static void
vmem_bootstrap(void)
{

	mutex_init(&vmem_list_lock, MUTEX_DEFAULT, IPL_VM);
	mutex_init(&vmem_btag_lock, MUTEX_DEFAULT, IPL_VM);
	mutex_init(&vmem_btag_refill_lock, MUTEX_DEFAULT, IPL_VM);

	while (static_bt_count-- > 0) {
		bt_t *bt = &static_bts[static_bt_count];
		LIST_INSERT_HEAD(&vmem_btag_freelist, bt, bt_freelist);
		VMEM_EVCNT_INCR(static_bt_count);
		vmem_btag_freelist_count++;
	}
	vmem_bootstrapped = TRUE;
}