Commit 39281709 authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add 'sqrtloop' test workload 



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: default avatarNamhyung 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 7cf0b4a7

tools/perf/tests/builtin-test.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -122,6 +122,7 @@ static struct test_workload *workloads[] = { 
	&workload__noploop,

	&workload__noploop,

	&workload__thloop,

	&workload__thloop,

	&workload__leafloop,

	&workload__leafloop,

	&workload__sqrtloop,

};

};





static int num_subtests(const struct test_suite *t)

static int num_subtests(const struct test_suite *t)

tools/perf/tests/tests.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -203,5 +203,6 @@ struct test_workload workload__##work = { \ 
DECLARE_WORKLOAD(noploop);

DECLARE_WORKLOAD(noploop);

DECLARE_WORKLOAD(thloop);

DECLARE_WORKLOAD(thloop);

DECLARE_WORKLOAD(leafloop);

DECLARE_WORKLOAD(leafloop);

DECLARE_WORKLOAD(sqrtloop);





#endif /* TESTS_H */
 
#endif /* TESTS_H */

tools/perf/tests/workloads/Build

+2 −0
Original line number Original line Diff line number Diff line
@@ -3,5 +3,7 @@ 
perf-y += noploop.o

perf-y += noploop.o

perf-y += thloop.o

perf-y += thloop.o

perf-y += leafloop.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
 
CFLAGS_leafloop.o         = -g -O0 -fno-inline -fno-omit-frame-pointer -U_FORTIFY_SOURCE

tools/perf/tests/workloads/sqrtloop.c

0 → 100644
+45 −0
Original line number Original line Diff line number Diff line 
/* 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);