linux-kernel - Re: [PATCH 02/12] perf test: Replace pipe test workload with noploop

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Date:   Mon, 14 Nov 2022 11:11:37 +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 02/12] perf test: Replace pipe test workload with noploop



On 10/11/2022 18:19, Namhyung Kim wrote:
> So that it can get rid of requirement of a compiler.
> Also define and use more local symbols to ease future changes.
> 
>   $ sudo ./perf test -v pipe
>    87: perf pipe recording and injection test                          :
>   --- start ---
>   test child forked, pid 748003
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.000 MB - ]
>       748014   748014       -1 |perf
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.000 MB - ]
>       99.83%  perf     perf                  [.] noploop
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.000 MB - ]
>       99.85%  perf     perf                  [.] noploop
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.160 MB /tmp/perf.data.2XYPdw (4007 samples) ]
>       99.83%  perf     perf                  [.] noploop
>   test child finished with 0
>   ---- end ----
>   perf pipe recording and injection test: Ok
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Tested-by: James Clark <james.clark@....com>

> ---
>  tools/perf/tests/shell/pipe_test.sh | 55 ++++++-----------------------
>  1 file changed, 10 insertions(+), 45 deletions(-)
> 
> diff --git a/tools/perf/tests/shell/pipe_test.sh b/tools/perf/tests/shell/pipe_test.sh
> index 1b32b4f28391..8dd115dd35a7 100755
> --- a/tools/perf/tests/shell/pipe_test.sh
> +++ b/tools/perf/tests/shell/pipe_test.sh
> @@ -2,68 +2,33 @@
>  # perf pipe recording and injection test
>  # SPDX-License-Identifier: GPL-2.0
>  
> -# skip if there's no compiler
> -if ! [ -x "$(command -v cc)" ]; then
> -	echo "failed: no compiler, install gcc"
> -	exit 2
> -fi
> -
> -file=$(mktemp /tmp/test.file.XXXXXX)
>  data=$(mktemp /tmp/perf.data.XXXXXX)
> +prog="perf test -w noploop"
> +task="perf"
> +sym="noploop"
>  
> -cat <<EOF | cc -o ${file} -x c -
> -#include <signal.h>
> -#include <stdlib.h>
> -#include <unistd.h>
> -
> -volatile int done;
> -
> -void sigalrm(int sig) {
> -	done = 1;
> -}
> -
> -__attribute__((noinline)) void noploop(void) {
> -	while (!done)
> -		continue;
> -}
> -
> -int main(int argc, char *argv[]) {
> -	int sec = 1;
> -
> -	if (argc > 1)
> -		sec = atoi(argv[1]);
> -
> -	signal(SIGALRM, sigalrm);
> -	alarm(sec);
> -
> -	noploop();
> -	return 0;
> -}
> -EOF
> -
> -
> -if ! perf record -e task-clock:u -o - ${file} | perf report -i - --task | grep test.file; then
> +if ! perf record -e task-clock:u -o - ${prog} | perf report -i - --task | grep ${task}; then
>  	echo "cannot find the test file in the perf report"
>  	exit 1
>  fi
>  
> -if ! perf record -e task-clock:u -o - ${file} | perf inject -b | perf report -i - | grep noploop; then
> +if ! perf record -e task-clock:u -o - ${prog} | perf inject -b | perf report -i - | grep ${sym}; then
>  	echo "cannot find noploop function in pipe #1"
>  	exit 1
>  fi
>  
> -perf record -e task-clock:u -o - ${file} | perf inject -b -o ${data}
> -if ! perf report -i ${data} | grep noploop; then
> +perf record -e task-clock:u -o - ${prog} | perf inject -b -o ${data}
> +if ! perf report -i ${data} | grep ${sym}; then
>  	echo "cannot find noploop function in pipe #2"
>  	exit 1
>  fi
>  
> -perf record -e task-clock:u -o ${data} ${file}
> -if ! perf inject -b -i ${data} | perf report -i - | grep noploop; then
> +perf record -e task-clock:u -o ${data} ${prog}
> +if ! perf inject -b -i ${data} | perf report -i - | grep ${sym}; then
>  	echo "cannot find noploop function in pipe #3"
>  	exit 1
>  fi
>  
>  
> -rm -f ${file} ${data} ${data}.old
> +rm -f ${data} ${data}.old
>  exit 0