Re: [PATCH 25/25] perf stat: Introduce --per-task option

David Ahern
2015-06-10T18:44:45Z

On 6/10/15 12:10 PM, Jiri Olsa wrote:
> Currently all the -p option PID arguments tasks values
> get aggregated and printed as single values.
>
> Adding --per-tasks option to print values per task.
>
> $ perf stat -e cycles,instructions --per-task -p 12451,16173
> ^C
> Performance counter stats for process id '12451,16173':
>
> TASK-12451 77,784 cycles
> TASK-16173 64,809 cycles
> TASK-12451 14,432 instructions
> TASK-16173 14,452 instructions
>
> 3.854957122 seconds time elapsed
>
> Also woks under interval mode:
>
> $ ./perf stat -e cycles,instructions --per-task -p 16431,16173 -I 1000
> # time task counts unit events
> 1.000085816 TASK-16173 0 cycles
> 1.000085816 TASK-16431 3,358,360,926 cycles
> 1.000085816 TASK-16173 0 instructions
> 1.000085816 TASK-16431 9,062,422,086 instructions
> 2.000212262 TASK-16173 65,386 cycles
> 2.000212262 TASK-16431 3,349,355,309 cycles
> 2.000212262 TASK-16173 12,151 instructions
> 2.000212262 TASK-16431 9,039,401,422 instructions
> 3.000333402 TASK-16173 62,797 cycles
> 3.000333402 TASK-16431 3,357,140,183 cycles
> 3.000333402 TASK-16173 12,208 instructions
> 3.000333402 TASK-16431 9,058,080,762 instructions
> ^C 3.375949851 TASK-16173 0 cycles
> 3.375949851 TASK-16431 1,264,764,804 cycles
> 3.375949851 TASK-16173 0 instructions
> 3.375949851 TASK-16431 3,414,532,317 instructions
>

Why not print $comm-$pid versus TASK-$pid?