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   perf-intel-pt    ( 1 )

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PERF INJECT

perf inject also accepts the --itrace option in which case
       tracing data is removed and replaced with the synthesized events.
       e.g.

           perf inject --itrace -i perf.data -o perf.data.new

       Below is an example of using Intel PT with autofdo. It requires
       autofdo (https://github.com/google/autofdo ) and gcc version 5.
       The bubble sort example is from the AutoFDO tutorial
       (https://gcc.gnu.org/wiki/AutoFDO/Tutorial ) amended to take the
       number of elements as a parameter.

           $ gcc-5 -O3 sort.c -o sort_optimized
           $ ./sort_optimized 30000
           Bubble sorting array of 30000 elements
           2254 ms

           $ cat ~/.perfconfig
           [intel-pt]
                   mispred-all = on

           $ perf record -e intel_pt//u ./sort 3000
           Bubble sorting array of 3000 elements
           58 ms
           [ perf record: Woken up 2 times to write data ]
           [ perf record: Captured and wrote 3.939 MB perf.data ]
           $ perf inject -i perf.data -o inj --itrace=i100usle --strip
           $ ./create_gcov --binary=./sort --profile=inj --gcov=sort.gcov -gcov_version=1
           $ gcc-5 -O3 -fauto-profile=sort.gcov sort.c -o sort_autofdo
           $ ./sort_autofdo 30000
           Bubble sorting array of 30000 elements
           2155 ms

       Note there is currently no advantage to using Intel PT instead of
       LBR, but that may change in the future if greater use is made of
       the data.