linux-kernel - Re: [PATCH] perf/core: Introduce cpuctx->cgrp_ctx

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Date:   Wed, 4 Oct 2023 14:27:46 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>, stable@...r.kernel.org
Subject: Re: [PATCH] perf/core: Introduce cpuctx->cgrp_ctx_list

On Wed, Oct 04, 2023 at 05:42:49PM +0200, Ingo Molnar wrote:
> 
> * Namhyung Kim <namhyung@...nel.org> 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@kernel.org/

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