[PATCH 17/31] perf hists: Add helper functions for hierarchy mode

From: Namhyung Kim The rb_hierarchy_{next,prev,last} functions are to traverse all hist entries in a hierarchy. They will be used by various function which supports hierarchy output. As the rb_hierarchy_next() is used to traverse the whole hierarchy, it sometime needs to

[PATCH 17/31] perf hists: Add helper functions for hierarchy mode

From: Namhyung Kim The rb_hierarchy_{next,prev,last} functions are to traverse all hist entries in a hierarchy. They will be used by various function which supports hierarchy output. As the rb_hierarchy_next() is used to traverse the whole hierarchy, it sometime needs to visit entries