linux-kernel - Re: [PATCH 10/12] perf test: Replace brstack test workload

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Date:   Fri, 11 Nov 2022 09:39:30 +0000
From:   James Clark <james.clark@....com>
To:     German Gomez <german.gomez@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Leo Yan <leo.yan@...aro.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 10/12] perf test: Replace brstack test workload



On 10/11/2022 19:31, German Gomez wrote:
> 
> On 10/11/2022 19:20, German Gomez wrote:
>> Hi Namhyung, thanks for doing the refactor, it looks a lot cleaner
>>
>> On 10/11/2022 18:19, Namhyung Kim wrote:
>>> So that it can get rid of requirement of a compiler.  Also rename the
>>> symbols to match with the perf test workload.
>>>
>>> Cc: German Gomez <german.gomez@....com>
>>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>>> ---
>>>  tools/perf/tests/shell/test_brstack.sh | 66 +++++---------------------
>>>  1 file changed, 12 insertions(+), 54 deletions(-)
>>>
>>> diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh
>>> index ec801cffae6b..a8a182dea25f 100755
>>> --- a/tools/perf/tests/shell/test_brstack.sh
>>> +++ b/tools/perf/tests/shell/test_brstack.sh
>>> @@ -4,18 +4,12 @@
>>>  # SPDX-License-Identifier: GPL-2.0
>>>  # German Gomez <german.gomez@....com>, 2022
>>>  
>>> -# we need a C compiler to build the test programs
>>> -# so bail if none is found
>>> -if ! [ -x "$(command -v cc)" ]; then
>>> -	echo "failed: no compiler, install gcc"
>>> -	exit 2
>>> -fi
>>> -
>>>  # skip the test if the hardware doesn't support branch stack sampling
>>>  # and if the architecture doesn't support filter types: any,save_type,u
>>>  perf record -b -o- -B --branch-filter any,save_type,u true > /dev/null 2>&1 || exit 2
> 
> Hmm I was wondering why this command was failing for me and always skipping the test. Is the -b conflicting with the --branch-filter here?
> 

Yes, the fix is here [1], but I don't see it on git yet.

[1]:
https://lore.kernel.org/linux-perf-users/Y2rDhkyn9ta5skDm@kernel.org/T/#t