linux-kernel - Re: [PATCH] perf test: Add skip to --per-thread test

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Date:   Mon, 2 May 2022 21:33:05 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, svens@...ux.ibm.com,
        gor@...ux.ibm.com, sumanthk@...ux.ibm.com, hca@...ux.ibm.com
Subject: Re: [PATCH] perf test: Add skip to --per-thread test

On Mon, May 2, 2022 at 2:39 AM Thomas Richter <tmricht@...ux.ibm.com> wrote:
>
> On 4/29/22 08:13, Ian Rogers wrote:
> > As reported in:
> > https://lore.kernel.org/linux-perf-users/20220428122821.3652015-1-tmricht@linux.ibm.com/
> > the 'instructions:u' event may not be supported. Add a skip using 'perf
> > stat'.
> >
> > Switch some code away from pipe to make the failures clearer.
> >
> > Reported-by: Thomas Richter <tmricht@...ux.ibm.com>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/tests/shell/record.sh | 44 +++++++++++++++++++++++++++++---
> >  1 file changed, 41 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> > index cd1cf14259b8..efc0cb07a929 100755
> > --- a/tools/perf/tests/shell/record.sh
> > +++ b/tools/perf/tests/shell/record.sh
> > @@ -5,11 +5,43 @@
> >  set -e
> >
> >  err=0
> > +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> > +
> > +cleanup() {
> > +  rm -f ${perfdata}
> > +  rm -f ${perfdata}.old
> > +  trap - exit term int
> > +}
> > +
> > +trap_cleanup() {
> > +  cleanup
> > +  exit 1
> > +}
> > +trap trap_cleanup exit term int
> > +
> >  test_per_thread() {
> >    echo "Basic --per-thread mode test"
> > -  perf record -e instructions:u --per-thread -o- true 2> /dev/null \
> > -    | perf report -i- -q \
> > -    | egrep -q true
> > +  if ! perf stat -e instructions:u --quiet true
> > +  then
> > +    echo "Per-thread record [Skipped instructions:u not supported]"
> > +    if [ $err -ne 1 ]
> > +    then
> > +      err=2
> > +    fi
> > +    return
> > +  fi
> > +  if ! perf record -e instructions:u --per-thread -o ${perfdata} true 2> /dev/null
> > +  then
> > +    echo "Per-thread record of instructions:u [Failed]"
> > +    err=1
> > +    return
> > +  fi
> > +  if ! perf report -i ${perfdata} -q | egrep -q true
> > +  then
> > +    echo "Per-thread record [Failed missing output]"
> > +    err=1
> > +    return
> > +  fi
> >    echo "Basic --per-thread mode test [Success]"
> >  }
> >
> > @@ -18,6 +50,10 @@ test_register_capture() {
> >    if ! perf list | egrep -q 'br_inst_retired.near_call'
> >    then
> >      echo "Register capture test [Skipped missing instruction]"
> > +    if [ $err -ne 1 ]
> > +    then
> > +      err=2
> > +    fi
> >      return
> >    fi
> >    if ! perf record --intr-regs=\? 2>&1 | egrep -q 'available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15'
> > @@ -39,4 +75,6 @@ test_register_capture() {
> >
> >  test_per_thread
> >  test_register_capture
> > +
> > +cleanup
> >  exit $err
>
> Ian,
>
> thanks very much for looking into this.
> I have tested your patch on several configurations and to be perfect, please
> change this line:
> # git diff
> diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> index efc0cb07a929..9cb8494f314d 100755
> --- a/tools/perf/tests/shell/record.sh
> +++ b/tools/perf/tests/shell/record.sh
> @@ -21,7 +21,7 @@ trap trap_cleanup exit term int
>
>  test_per_thread() {
>    echo "Basic --per-thread mode test"
> -  if ! perf stat -e instructions:u --quiet true
> +  if ! perf record -e instructions:u --quiet true 2> /dev/null
>    then
>      echo "Per-thread record [Skipped instructions:u not supported]"
>      if [ $err -ne 1 ]
> #
>
> This runs fine, just use record instead of stat, you use perf record later
> on anyway.
>
> With this change you have my
> Tested-by: Thomas Richter <tmricht@...ux.ibm.com>

Thanks! Done, but I also add a '-o' in v2 so the perf.data file is
cleaned up by the cleanup function.

Ian

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