linux-kernel - Re: [PATCH linux-next] perf test: Fix test perf evlist for z/VM s390x

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Message-ID: <CAP-5=fXPGXJMDPQc4XxrEWW_HgJTbrbL6g1xfTBn14jDiW0Yxw@mail.gmail.com>
Date: Mon, 26 Jan 2026 09:42:54 -0800
From: Ian Rogers <irogers@...gle.com>
To: Thomas Richter <tmricht@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, acme@...nel.org, namhyung@...nel.org, 
	agordeev@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com, 
	hca@...ux.ibm.com, japo@...ux.ibm.com
Subject: Re: [PATCH linux-next] perf test: Fix test perf evlist for z/VM s390x

On Mon, Jan 26, 2026 at 2:18 AM Thomas Richter <tmricht@...ux.ibm.com> wrote:
>
> Perf test case 'perf evlist tests' fails on z/VM machines on s390.
>
> The failure is causes by event cycles. This event is not available
> on virtualized machines like z/VM on s390.
> Change to software event cpu-clock to fix this.
>
>     Output before:
>       # ./perf test 78
>       79: perf evlist tests              : FAILED!
>       #
>
>     Output after:
>       # ./perf test 78
>       79: perf evlist tests              : Ok
>       #
>
> Fixes: b04d2b919912 ("perf test: Fix test case perf evlist tests for s390x")
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> Tested-by: Jan Polensky <japo@...ux.ibm.com>
> Reviewed-by: Jan Polensky <japo@...ux.ibm.com>
> Cc: Ian Rogers <irogers@...gle.com>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks!
Ian

> ---
>  tools/perf/tests/shell/evlist.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/tests/shell/evlist.sh b/tools/perf/tests/shell/evlist.sh
> index 5632be391710..8a22f4171c07 100755
> --- a/tools/perf/tests/shell/evlist.sh
> +++ b/tools/perf/tests/shell/evlist.sh
> @@ -21,13 +21,13 @@ trap trap_cleanup EXIT TERM INT
>
>  test_evlist_simple() {
>         echo "Simple evlist test"
> -       if ! perf record -e cycles -o "${perfdata}" true 2> /dev/null
> +       if ! perf record -e cpu-clock -o "${perfdata}" true 2> /dev/null
>         then
>                 echo "Simple evlist [Failed record]"
>                 err=1
>                 return
>         fi
> -       if ! perf evlist -i "${perfdata}" | grep -q "cycles"
> +       if ! perf evlist -i "${perfdata}" | grep -q "cpu-clock"
>         then
>                 echo "Simple evlist [Failed to list event]"
>                 err=1
> --
> 2.52.0
>