linux-kernel - Re: [PATCH 03/12] perf test: Add 'thloop' test workload

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Date:   Wed, 9 Nov 2022 15:39:55 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, 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>,
        James Clark <james.clark@....com>
Subject: Re: [PATCH 03/12] perf test: Add 'thloop' test workload

Em Wed, Nov 09, 2022 at 09:46:26AM -0800, Namhyung Kim escreveu:
> The thloop is similar to noploop but runs in two threads.  This is
> needed to verify perf record --per-thread to handle multi-threaded
> programs properly.
> 
>   $ perf test -w thloop
> 
> It also takes an optional argument to specify runtime in seconds
> (default: 1).
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/tests/builtin-test.c     |  1 +
>  tools/perf/tests/tests.h            |  1 +
>  tools/perf/tests/workloads/Build    |  1 +
>  tools/perf/tests/workloads/thloop.c | 53 +++++++++++++++++++++++++++++
>  4 files changed, 56 insertions(+)
>  create mode 100644 tools/perf/tests/workloads/thloop.c
> 
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index ce641ccfcf81..161f38476e77 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -120,6 +120,7 @@ static struct test_suite **tests[] = {
>  
>  static struct test_workload *workloads[] = {
>  	&workload__noploop,
> +	&workload__thloop,
>  };
>  
>  static int num_subtests(const struct test_suite *t)
> diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
> index d315d0d6fc97..e6edfeeadaeb 100644
> --- a/tools/perf/tests/tests.h
> +++ b/tools/perf/tests/tests.h
> @@ -201,5 +201,6 @@ struct test_workload workload__##work = {	\
>  
>  /* The list of test workloads */
>  DECLARE_WORKLOAD(noploop);
> +DECLARE_WORKLOAD(thloop);
>  
>  #endif /* TESTS_H */
> diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
> index f98e968d4633..b8964b1099c0 100644
> --- a/tools/perf/tests/workloads/Build
> +++ b/tools/perf/tests/workloads/Build
> @@ -1,3 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
>  perf-y += noploop.o
> +perf-y += thloop.o
> diff --git a/tools/perf/tests/workloads/thloop.c b/tools/perf/tests/workloads/thloop.c
> new file mode 100644
> index 000000000000..7fd3ac79e732
> --- /dev/null
> +++ b/tools/perf/tests/workloads/thloop.c
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <pthread.h>
> +#include <stdlib.h>
> +#include <signal.h>
> +#include <unistd.h>
> +#include <linux/compiler.h>
> +#include "../tests.h"
> +
> +static volatile int done;
> +static volatile unsigned count;

sig_atomic_t

> +/* We want to check this symbol in perf report */
> +noinline void test_loop(void);
> +
> +static void sighandler(int sig __maybe_unused)
> +{
> +	done = 1;
> +}
> +
> +noinline void test_loop(void)
> +{
> +	while (!done)
> +		count++;
> +}
> +
> +static void *thfunc(void *arg)
> +{
> +	void (*loop_fn)(void) = arg;
> +
> +	loop_fn();
> +	return NULL;
> +}
> +
> +static int thloop(int argc, const char **argv)
> +{
> +	int sec = 1;
> +	pthread_t th;
> +
> +	if (argc > 0)
> +		sec = atoi(argv[0]);
> +
> +	signal(SIGINT, sighandler);
> +	signal(SIGALRM, sighandler);
> +	alarm(sec);
> +
> +	pthread_create(&th, NULL, thfunc, test_loop);
> +	test_loop();
> +	pthread_join(th, NULL);
> +
> +	return 0;
> +}
> +
> +DEFINE_WORKLOAD(thloop);
> -- 
> 2.38.1.431.g37b22c650d-goog

-- 

- Arnaldo