I am creating a resumé. I want to know whether mentioning stackoverflow profile counts for much in terms of interview factors, e.g. showing my knowledgeability and performance.
It entirely depends on the person who is going to interview you, I guess. And of course, what your profile looks like. In general, Stack Overflow has become a very well-known resource over the past years - especially in the US, there is a good chance your interviewer knows the site.
If you are referring to your current Stack Overflow profile, I'd say it won't impress a recruiter much in it current state - it contains 4 questions, one of them downvoted, and only one answer that, while probably helpful, doesn't help prove that you are a knowledgeable person.
Currently the answer is No, as Pekka already said.
However, if and when you will gain enough reputation you will be invited to create a professional profile here. ( Stack Overflow Careers site)
This can be introduced in job interviews and will even help you find jobs, pretty similar to LinkedIn.