Cut pork loin into 1/2-inch-thick slices, then into 1/4-inch-wide strips. In large skillet over medium-high heat, heat 1 tablespoon oil.
Stir-fry half the pork loin for 7-8 minutes until well-browned. Set aside on separate plate and repeat with 1 tablespoon oil and remaining pork.
Cook pasta according to package directions.
In skillet over medium-high heat, heat remaining oil; add mushrooms and sprinkle with salt, to taste. Cook 3 minutes, or until tender, stirring occasionally.
Drain pasta and return to pot; stir in pork, mushrooms and Alfredo sauce. Stir over medium heat about 4 minutes until heated through. Season with salt and pepper.
Sprinkle with green onions and Parmesan cheese, if desired.