Traversing Runqueu - CFS

Hi, Looking for a way to traverse the runqueue, so that I could get the contents of the runqueue. Initial reading tells that sched.h has ched_entity structure, which holds some of the data for it, like the struct rb_node run_node; Also read that redblack tree is used to hold the elements with "vruntime" as the index of it. Could anyone give a way forward to doing this.