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perf test: Add 'sqrtloop' test workload

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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).

Committer notes:

Explicitely ignored the sqrt() return to fix the build on systems where
the compiler complains it isn't being used.

And added a sqrtloop specific CFLAGS to disable optimizations to make
this a bit more robust wrt dead code elimination.

Doing that a -U_FORTIFY_SOURCE needs to be added, as -O0 is incompatible
with it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221116233854.1596378-8-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2022-11-16 15:38:49 -08:00 committed by Arnaldo Carvalho de Melo
parent 7cf0b4a73a
commit 39281709a6
4 changed files with 49 additions and 0 deletions
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1
tools/perf/tests/builtin-test.c
View File

@ -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)

1
tools/perf/tests/tests.h
View File

@ -203,5 +203,6 @@ struct test_workload workload__##work = { \
DECLARE_WORKLOAD(noploop);
DECLARE_WORKLOAD(thloop);
DECLARE_WORKLOAD(leafloop);
DECLARE_WORKLOAD(sqrtloop);
#endif /* TESTS_H */

2
tools/perf/tests/workloads/Build
View File

@ -3,5 +3,7 @@
perf-y += noploop.o
perf-y += thloop.o
perf-y += leafloop.o
perf-y += sqrtloop.o
CFLAGS_sqrtloop.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE
CFLAGS_leafloop.o = -g -O0 -fno-inline -fno-omit-frame-pointer -U_FORTIFY_SOURCE

45
tools/perf/tests/workloads/sqrtloop.c Normal file
View File

@ -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)
(void)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);