linux-kernel - Re: [PATCH 12/12] perf test: Replace data symbol test workload with datasym

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Message-ID: <f1006813-9367-975c-573b-de2c859a65e9@arm.com>
Date:   Mon, 14 Nov 2022 11:14:26 +0000
From:   James Clark <james.clark@....com>
To:     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>,
        German Gomez <german.gomez@....com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 12/12] perf test: Replace data symbol test workload with
 datasym



On 10/11/2022 18:19, Namhyung Kim wrote:
> So that it can get rid of requirement of a compiler.
> 
>   $ sudo ./perf test -v 109
>   109: Test data symbol                                                :
>   --- start ---
>   test child forked, pid 844526
>   Recording workload...
>   [ perf record: Woken up 2 times to write data ]
>   [ perf record: Captured and wrote 0.354 MB /tmp/__perf_test.perf.data.GFeZO (4847 samples) ]
>   Cleaning up files...
>   test child finished with 0
>   ---- end ----
>   Test data symbol: Ok
> 
> Cc: Leo Yan <leo.yan@...aro.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/tests/shell/test_data_symbol.sh | 29 +---------------------
>  1 file changed, 1 insertion(+), 28 deletions(-)
> 
Tested-by: James Clark <james.clark@....com>


> diff --git a/tools/perf/tests/shell/test_data_symbol.sh b/tools/perf/tests/shell/test_data_symbol.sh
> index cd6eb54d235d..d871e6c743ef 100755
> --- a/tools/perf/tests/shell/test_data_symbol.sh
> +++ b/tools/perf/tests/shell/test_data_symbol.sh
> @@ -11,13 +11,7 @@ skip_if_no_mem_event() {
>  
>  skip_if_no_mem_event || exit 2
>  
> -# skip if there's no compiler
> -if ! [ -x "$(command -v cc)" ]; then
> -	echo "skip: no compiler, install gcc"
> -	exit 2
> -fi
> -
> -TEST_PROGRAM=$(mktemp /tmp/__perf_test.program.XXXXX)
> +TEST_PROGRAM="perf test -w datasym"
>  PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>  
>  check_result() {
> @@ -45,31 +39,10 @@ cleanup_files()
>  {
>  	echo "Cleaning up files..."
>  	rm -f ${PERF_DATA}
> -	rm -f ${TEST_PROGRAM}
>  }
>  
>  trap cleanup_files exit term int
>  
> -# compile test program
> -echo "Compiling test program..."
> -cat << EOF | cc -o ${TEST_PROGRAM} -x c -
> -typedef struct _buf {
> -	char data1;
> -	char reserved[55];
> -	char data2;
> -} buf __attribute__((aligned(64)));
> -
> -static buf buf1;
> -
> -int main(void) {
> -	for (;;) {
> -		buf1.data1++;
> -		buf1.data2 += buf1.data1;
> -	}
> -	return 0;
> -}
> -EOF
> -
>  echo "Recording workload..."
>  
>  # perf mem/c2c internally uses IBS PMU on AMD CPU which doesn't support