perf stat: Print out miss/hit ratio for L1 data-cache events

Print out this kind of l1-dcache-misses percentage:

 Performance counter stats for './bw_tcp localhost':

    29,956,262,201 cycles                   #    3.002 GHz                      (scaled from 85.14%)
     8,255,209,558 stalled-cycles           #   27.56% of all cycles are idle   (scaled from 86.56%)
     1,206,130,308 l1-dcache-misses         #   40.49% of all L1-dcache hits    (scaled from 86.30%)
     2,978,756,779 l1-dcache-refs           #  298.512 M/sec                    (scaled from 70.02%)
     8,861,956,159 instructions             #    0.30  insns per cycle
                                            #    0.93  stalled cycles per insn  (scaled from 84.27%)
     1,644,306,068 branches                 #  164.782 M/sec                    (scaled from 86.43%)
        74,778,443 branch-misses            #    4.55% of all branches          (scaled from 70.69%)
       9978.695711 task-clock               #    0.693 CPUs utilized

       14.404347983  seconds time elapsed

And color the result depending on the severity of cache-trashing.

Acked-by: Peter Zijlstra <[email protected]>
Acked-by Arnaldo Carvalho de Melo <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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