How did Jesus know?

30 And Jesus, immediately knowing in himself that virtue had gone out of him, turned him about in the press, and said, Who touched my clothes?

What does it mean by "knowing in Himself"?

Did Jesus know the woman touched Him of His own divinity or did the Holy Spirit give Him the knowledge?

Well Jesus was wholly in step with the Father's will, He says in John 5:19 "...the Son can do nothing of Himself, but what He seeth the Father do..." and in v30, "I can of mine own self do nothing," so whether in connection with the Father He knew, or by the Holy Spirit, (same?). Regardless, He could distinguish the touch of faith from the casual contact of the careless throng.

well said Greenpea1