When London documentary filmmaker Kim Longinotto was a girl, her parents sent her to a remote Buckinghamshire boarding school, where the arbitrary rules and repressive atmosphere created a lifelong distrust of authority. Then, when she was 17, she ran away, ending up homeless on the streets of Europe. The two experiences provided the basis for the work that has engaged her since she made her first film 30 years ago. That film, “Pride of Place,” was about the very boarding school that tormented her adolescence. Pam Grady profiles Longinotto in the San Francisco Chronicle.