perf stat: Add -d/--detailed flag to run with a lot of events

Add the new -d/--detailed flag, which generates a pretty detailed event list:

 Performance counter stats for './hackbench 10' (10 runs):

       1514.287888 task-clock               #   10.897 CPUs utilized            ( +-  3.05% )
            39,698 context-switches         #    0.026 M/sec                    ( +- 12.19% )
             8,147 CPU-migrations           #    0.005 M/sec                    ( +- 16.55% )
            17,918 page-faults              #    0.012 M/sec                    ( +-  0.37% )
     2,944,504,050 cycles                   #    1.944 GHz                      ( +-  3.89% )  (32.60%)
     1,043,971,283 stalled-cycles           #   35.45% of all cycles are idle   ( +-  5.22% )  (44.48%)
     1,655,906,768 instructions             #    0.56  insns per cycle
                                            #    0.63  stalled cycles per insn  ( +-  1.95% )  (55.09%)
       338,832,373 branches                 #  223.757 M/sec                    ( +-  1.96% )  (64.47%)
         3,892,416 branch-misses            #    1.15% of all branches          ( +-  5.49% )  (73.12%)
       606,410,482 L1-dcache-loads          #  400.459 M/sec                    ( +-  1.29% )  (71.21%)
        31,204,395 L1-dcache-load-misses    #    5.15% of all L1-dcache hits    ( +-  3.04% )  (60.43%)
         3,922,751 LLC-loads                #    2.590 M/sec                    ( +-  6.80% )  (46.87%)
         5,037,288 LLC-load-misses          #    3.327 M/sec                    ( +-  3.56% )  (13.00%)

        0.138966828  seconds time elapsed  ( +-  4.11% )

This can be used "at a glance" for narrower analysis.

-d can also be used in addition to other -e events, to further expand an event list.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-cxs98quixs3qyvdqx3goojc4@git.kernel.org


Signed-off-by: Ingo Molnar <mingo@elte.hu>