[tip:perf/core] perf hists: Add helper functions for hierarchy mode

Commit-ID: 8c01872fe3c17fde1ce74eecf523d6d7fce5ffec Gitweb: http://git.kernel.org/tip/8c01872fe3c17fde1ce74eecf523d6d7fce5ffec Author: Namhyung Kim AuthorDate: Thu, 25 Feb 2016 00:13:36 +0900 Committer: Arnaldo Carvalho de Melo CommitDate: Wed, 24

[tip:perf/core] perf hists: Add helper functions for hierarchy mode

Commit-ID: 8c01872fe3c17fde1ce74eecf523d6d7fce5ffec Gitweb: http://git.kernel.org/tip/8c01872fe3c17fde1ce74eecf523d6d7fce5ffec Author: Namhyung Kim AuthorDate: Thu, 25 Feb 2016 00:13:36 +0900 Committer: Arnaldo Carvalho de Melo CommitDate: Wed, 24 Feb 2016 16:55:17 -0300 perf hists: