Why the memory increased about 100KB every time
===

When I call the method `[self presentViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"MagicPaint"] animated:YES completion:^{}];`
and In MagicPaint, after touch Back button, `[self dismissViewControllerAnimated:NO completion:^{}];`
It increase about 100KB physical memory every time.

How can i to release that 100KB memory??

I am using iOS 5.0 ARC 