linux-kernel - Re: [PATCH 07/12] perf test: Add 'sqrtloop' test workload

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Date:   Thu, 10 Nov 2022 09:48:54 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     German Gomez <german.gomez@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>
Subject: Re: [PATCH 07/12] perf test: Add 'sqrtloop' test workload

Hello,

On Thu, Nov 10, 2022 at 6:49 AM German Gomez <german.gomez@....com> wrote:
>
> On 09/11/2022 17:46, Namhyung Kim wrote:
> > The sqrtloop creates a child process to run an infinite loop calling
> > sqrt() with rand().  This is needed for ARM SPE fork test.
> >
> >   $ perf test -w sqrtloop
> >
> > It can take an optional argument to specify how long it will run 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/sqrtloop.c | 44 +++++++++++++++++++++++++++
> >  4 files changed, 47 insertions(+)
> >  create mode 100644 tools/perf/tests/workloads/sqrtloop.c
> >
> > diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> > index 0ed5ac452f6e..9acb7a93eeb9 100644
> > --- a/tools/perf/tests/builtin-test.c
> > +++ b/tools/perf/tests/builtin-test.c
> > @@ -122,6 +122,7 @@ static struct test_workload *workloads[] = {
> >       &workload__noploop,
> >       &workload__thloop,
> >       &workload__leafloop,
> > +     &workload__sqrtloop,
> >  };
> >
> >  static int num_subtests(const struct test_suite *t)
> > diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
> > index 86804dd6452b..18c40319e67c 100644
> > --- a/tools/perf/tests/tests.h
> > +++ b/tools/perf/tests/tests.h
> > @@ -203,5 +203,6 @@ struct test_workload workload__##work = { \
> >  DECLARE_WORKLOAD(noploop);
> >  DECLARE_WORKLOAD(thloop);
> >  DECLARE_WORKLOAD(leafloop);
> > +DECLARE_WORKLOAD(sqrtloop);
> >
> >  #endif /* TESTS_H */
> > diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
> > index 631596bdb2b3..1ca95cb0fdb5 100644
> > --- a/tools/perf/tests/workloads/Build
> > +++ b/tools/perf/tests/workloads/Build
> > @@ -3,5 +3,6 @@
> >  perf-y += noploop.o
> >  perf-y += thloop.o
> >  perf-y += leafloop.o
> > +perf-y += sqrtloop.o
> >
> >  CFLAGS_leafloop.o         = -g -O0 -fno-inline -fno-omit-frame-pointer
> > diff --git a/tools/perf/tests/workloads/sqrtloop.c b/tools/perf/tests/workloads/sqrtloop.c
> > new file mode 100644
> > index 000000000000..f7d1f8d4867b
> > --- /dev/null
> > +++ b/tools/perf/tests/workloads/sqrtloop.c
> > @@ -0,0 +1,44 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +#include <math.h>
> > +#include <signal.h>
> > +#include <stdlib.h>
> > +#include <linux/compiler.h>
> > +#include <sys/wait.h>
> > +#include "../tests.h"
> > +
> > +static volatile int done;
> > +
> > +static void sighandler(int sig __maybe_unused)
> > +{
> > +     done = 1;
> > +}
> > +
> > +static int __sqrtloop(int sec)
> > +{
> > +     signal(SIGALRM, sighandler);
> > +     alarm(sec);
> > +
> > +     while (!done)
> > +             sqrt(rand());
> > +     return 0;
> > +}
>
> I get some implicit declaration errors on x86 build
>
> (gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0)
>
> .  CC      tests/workloads/sqrtloop.o
> .tests/workloads/sqrtloop.c: In function ‘__sqrtloop’:
> .tests/workloads/sqrtloop.c:19:2: error: implicit declaration of function ‘alarm’ [-Werror=implicit-function-declaration]
> .   19 |  alarm(sec);
> .      |  ^~~~~
> .tests/workloads/sqrtloop.c: In function ‘sqrtloop’:
> .tests/workloads/sqrtloop.c:33:10: error: implicit declaration of function ‘fork’ [-Werror=implicit-function-declaration]
> .   33 |  switch (fork()) {
> .      |          ^~~~

Oh, thanks for letting me know.  I think it needs <unitstd.h>.
Will fix in v2.

Thanks,
Namhyung

>
> > +
> > +static int sqrtloop(int argc, const char **argv)
> > +{
> > +     int sec = 1;
> > +
> > +     if (argc > 0)
> > +             sec = atoi(argv[0]);
> > +
> > +     switch (fork()) {
> > +     case 0:
> > +             return __sqrtloop(sec);
> > +     case -1:
> > +             return -1;
> > +     default:
> > +             wait(NULL);
> > +     }
> > +     return 0;
> > +}
> > +
> > +DEFINE_WORKLOAD(sqrtloop);