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    Subject[PATCH 07/12] perf test: Add 'sqrtloop' test workload
    Date
    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@kernel.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 | 45 +++++++++++++++++++++++++++
    4 files changed, 48 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..1e44d541d737
    --- /dev/null
    +++ b/tools/perf/tests/workloads/sqrtloop.c
    @@ -0,0 +1,45 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +#include <math.h>
    +#include <signal.h>
    +#include <stdlib.h>
    +#include <unistd.h>
    +#include <linux/compiler.h>
    +#include <sys/wait.h>
    +#include "../tests.h"
    +
    +static volatile sig_atomic_t 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;
    +}
    +
    +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);
    --
    2.38.1.493.g58b659f92b-goog
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