linux-kernel - Re: [PATCH] perf test: Fix fails of perf stat --bpf-counters --for-each-cgroup on s390

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Message-ID: <de0dd86a-4c49-49ed-a90b-4890c82a7b2d@linux.ibm.com>
Date:   Fri, 8 Dec 2023 12:07:52 +0100
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, svens@...ux.ibm.com, gor@...ux.ibm.com,
        sumanthk@...ux.ibm.com, hca@...ux.ibm.com
Subject: Re: [PATCH] perf test: Fix fails of perf stat --bpf-counters
 --for-each-cgroup on s390

On 12/8/23 00:26, Namhyung Kim wrote:

> Thanks for the patch.  But I think it should support
> machines without systemd (or maybe with old versions).
>
> Also probably you want to reset the behavior after
> the test.  I think we can just run some built-in test
> workload like `perf test -w thloop`.
>
> Thanks,
> Namhyung

Thanks for our feedback.
Well regarding the use of systemd daemon-reexec the manual says
this command restarts the systemd triggered processes.
There is nothing to reset. All ports stay active while the command
is processed.

I tried your 'perf test -w thloop`, but that did not trigger
anything on system.slice.

I do not understand enough about cgroups and system.slice, but I am
under the impression, that the system.slice just increment counters
when executed by processes under systemd control. Maybe I am wrong.

The only other workload which always incremented system.slice counters
was 'ssh localhost ls -l', which involves local login and a running sshd.

Thanks for your advice on how to continue on this.

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
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