Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 07/12] perf test: Add 'sqrtloop' test workload | Date | Wed, 16 Nov 2022 15:38:49 -0800 |
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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); -- 2.38.1.584.g0f3c55d4c2-goog
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