Re: [patch] x86, perf_counter, bts: add bts to perf_counter

[Ingo Molnar]

btw., the number of samples seems to be varying too widely:

titan:~> for ((i=0;i<10;i++)); do perf record -f -e branches:u -c 1 true 2>/dev/null; perf report | head -1; done
# Samples: 28784
# Samples: 24063
# Samples: 22788
# Samples: 30449
# Samples: 15335
# Samples: 30557
# Samples: 24010
# Samples: 23866
# Samples: 24877
# Samples: 24330

compared to the branch-stat itself:

titan:~> perf stat -v --repeat 10 -e branches:u true
[ perf stat: executing run #1 ... ]
[ perf stat: executing run #2 ... ]
[ perf stat: executing run #3 ... ]
[ perf stat: executing run #4 ... ]
[ perf stat: executing run #5 ... ]
[ perf stat: executing run #6 ... ]
[ perf stat: executing run #7 ... ]
[ perf stat: executing run #8 ... ]
[ perf stat: executing run #9 ... ]
[ perf stat: executing run #10 ... ]

 Performance counter stats for 'true' (10 runs):

          23851  branches                   ( +-   0.000% )

    0.000639653  seconds time elapsed   ( +-   2.474% )

do we lose records in the recording?

	Ingo
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