Re: [PATCH] perf/core: Introduce cpuctx->cgrp_ctx_list

[Namhyung Kim]

On Wed, Oct 04, 2023 at 05:42:49PM +0200, Ingo Molnar wrote:
> 
> * Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
> 
> > Maybe I can add an option to perf bench sched to place
> > senders and receivers in different cgroups.
> 
> That would certainly be useful to measure cgroups overhead.

Sent out the change:

  https://lore.kernel.org/all/20231004204741.985422-1-namhyung@xxxxxxxxxx/

With that, the numbers became stable. :)

Before)

  $ taskset -c 0 ./perf bench sched pipe -l 10000 -G AAA,BBB
  # Running 'sched/pipe' benchmark:
  # Executed 10000 pipe operations between two processes
  
       Total time: 0.901 [sec]
  
        90.128700 usecs/op
            11095 ops/sec


After)

  $ taskset -c 0 ./perf bench sched pipe -l 10000 -G AAA,BBB
  # Running 'sched/pipe' benchmark:
  # Executed 10000 pipe operations between two processes
  
       Total time: 0.065 [sec]
  
         6.560100 usecs/op
           152436 ops/sec


Thanks,
Namhyung