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Message-ID: <ZR3Y0sqMJICfJuDF@google.com>
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
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