perf sched: Add timehist subcommand

Ingo/Arnaldo:

I have a lot of patches queued up on top of this set. Before I go much farther and the queue grows longer I wanted to throw out this set for comments, review and inclusion where possible. Most of the patches are cleanups and re-workings leading up to the new command. The patches I have after this continue to add more features and options to the timehist command to match what I have been using for the past few years.

David Ahern (19):
perf: sample after exit loses thread correlation - v3
perf sched: simplify arguments to read_events
perf sched: remove thread lookup in sample handler
perf sched: remove sched_process_exit tracepoint
perf sched: remove sched_process_fork tracepoint
perf symbol: add optimization for idle kernel symbols
perf top: use new idle_sym check
perf symbol: save vmlinux or kallsyms path loaded
perf tool: Simplify options to perf_evsel__print_ip
perf tool: Add option to print stack trace on single line
perf tool: Add option to limit stack depth in callchain dumps perf tool: Add support for exclude symbol list to symbol_conf perf tool: Skip symbols in exclude list while printing callchain perf sched: pass event to evsel handlers using data element perf sched: Add timehist command
perf tool: Change perf_session__has_traces to actually check for tracepoints perf sched timehist: add support for context-switch event
perf sched timehist: print all events in verbose mode
perf sched timehist: add pid/tid option

 tools/perf/builtin-sched.c  |  959 ++++++++++++++++++++++++++++++++++++++++---
 tools/perf/builtin-script.c |   29 +-
 tools/perf/builtin-top.c    |   25 +-
 tools/perf/util/machine.c   |   37 +-
 tools/perf/util/session.c   |   39 +-
 tools/perf/util/session.h   |    8 +-
 tools/perf/util/symbol.c    |   71 +++-
 tools/perf/util/symbol.h    |    8 +-
 8 files changed, 1063 insertions(+), 113 deletions(-)

1.7.10.1