How could I add support for an event modifier in perf

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I need to account power for the kernel space, but unfortunately the k modifier are not supported for the power/energy-cores/. I have an example of what I'm trying to do below.



I'm reading the source of perf and the structure of the Kernel PMU Events, but I'm a bit lost. Is there someone familiar with the source code of perf who could share some tips of how these modifiers works in the source?



 user@dkphome:~$ sudo perf stat -a -e power/energy-cores/k -I 1000 sleep 5
 # time counts unit events
 1.000099515 <not supported> Joules power/energy-cores/k 
 2.000246523 <not supported> Joules power/energy-cores/k 
 3.000440743 <not supported> Joules power/energy-cores/k 
 4.000673143 <not supported> Joules power/energy-cores/k 
 5.000722624 <not supported> Joules power/energy-cores/k 
 user@dkphome:~$ sudo perf stat -a -e power/energy-cores/ -I 1000 sleep 5
 # time counts unit events
 1.000128209 0,19 Joules power/energy-cores/ 
 2.000257170 0,25 Joules power/energy-cores/ 
 3.000406715 0,26 Joules power/energy-cores/ 
 4.000571140 0,20 Joules power/energy-cores/ 
 5.000711815 1,01 Joules power/energy-cores/ 
 5.000882867 0,00 Joules power/energy-cores/


PS: This other question was a lot of help What are Kernel PMU event-s in perf_events list?




linux-kernel cpu power-management perf




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    up vote
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    down vote

    favorite












    I need to account power for the kernel space, but unfortunately the k modifier are not supported for the power/energy-cores/. I have an example of what I'm trying to do below.



    I'm reading the source of perf and the structure of the Kernel PMU Events, but I'm a bit lost. Is there someone familiar with the source code of perf who could share some tips of how these modifiers works in the source?



     user@dkphome:~$ sudo perf stat -a -e power/energy-cores/k -I 1000 sleep 5
     # time counts unit events
     1.000099515 <not supported> Joules power/energy-cores/k 
     2.000246523 <not supported> Joules power/energy-cores/k 
     3.000440743 <not supported> Joules power/energy-cores/k 
     4.000673143 <not supported> Joules power/energy-cores/k 
     5.000722624 <not supported> Joules power/energy-cores/k 
     user@dkphome:~$ sudo perf stat -a -e power/energy-cores/ -I 1000 sleep 5
     # time counts unit events
     1.000128209 0,19 Joules power/energy-cores/ 
     2.000257170 0,25 Joules power/energy-cores/ 
     3.000406715 0,26 Joules power/energy-cores/ 
     4.000571140 0,20 Joules power/energy-cores/ 
     5.000711815 1,01 Joules power/energy-cores/ 
     5.000882867 0,00 Joules power/energy-cores/


    PS: This other question was a lot of help What are Kernel PMU event-s in perf_events list?




    linux-kernel cpu power-management perf




    share|improve this question
























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I need to account power for the kernel space, but unfortunately the k modifier are not supported for the power/energy-cores/. I have an example of what I'm trying to do below.



      I'm reading the source of perf and the structure of the Kernel PMU Events, but I'm a bit lost. Is there someone familiar with the source code of perf who could share some tips of how these modifiers works in the source?



       user@dkphome:~$ sudo perf stat -a -e power/energy-cores/k -I 1000 sleep 5
       # time counts unit events
       1.000099515 <not supported> Joules power/energy-cores/k 
       2.000246523 <not supported> Joules power/energy-cores/k 
       3.000440743 <not supported> Joules power/energy-cores/k 
       4.000673143 <not supported> Joules power/energy-cores/k 
       5.000722624 <not supported> Joules power/energy-cores/k 
       user@dkphome:~$ sudo perf stat -a -e power/energy-cores/ -I 1000 sleep 5
       # time counts unit events
       1.000128209 0,19 Joules power/energy-cores/ 
       2.000257170 0,25 Joules power/energy-cores/ 
       3.000406715 0,26 Joules power/energy-cores/ 
       4.000571140 0,20 Joules power/energy-cores/ 
       5.000711815 1,01 Joules power/energy-cores/ 
       5.000882867 0,00 Joules power/energy-cores/


      PS: This other question was a lot of help What are Kernel PMU event-s in perf_events list?




      linux-kernel cpu power-management perf




      share|improve this question














      I need to account power for the kernel space, but unfortunately the k modifier are not supported for the power/energy-cores/. I have an example of what I'm trying to do below.



      I'm reading the source of perf and the structure of the Kernel PMU Events, but I'm a bit lost. Is there someone familiar with the source code of perf who could share some tips of how these modifiers works in the source?



       user@dkphome:~$ sudo perf stat -a -e power/energy-cores/k -I 1000 sleep 5
       # time counts unit events
       1.000099515 <not supported> Joules power/energy-cores/k 
       2.000246523 <not supported> Joules power/energy-cores/k 
       3.000440743 <not supported> Joules power/energy-cores/k 
       4.000673143 <not supported> Joules power/energy-cores/k 
       5.000722624 <not supported> Joules power/energy-cores/k 
       user@dkphome:~$ sudo perf stat -a -e power/energy-cores/ -I 1000 sleep 5
       # time counts unit events
       1.000128209 0,19 Joules power/energy-cores/ 
       2.000257170 0,25 Joules power/energy-cores/ 
       3.000406715 0,26 Joules power/energy-cores/ 
       4.000571140 0,20 Joules power/energy-cores/ 
       5.000711815 1,01 Joules power/energy-cores/ 
       5.000882867 0,00 Joules power/energy-cores/


      PS: This other question was a lot of help What are Kernel PMU event-s in perf_events list?





      linux-kernel cpu power-management perf





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      edited Oct 14 '17 at 16:57

























      asked Oct 14 '17 at 3:26









      Leandro Silva

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