Commit a104f0ea authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
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perf test: Add 'brstack' test workload 



The brstack is to run different kinds of branches repeatedly.  This is
necessary for brstack test case to verify if it has correct branch info.

  $ perf test -w brstack

I renamed the internal functions to have brstack_ prefix as it's too
generic name.

Add a -U_FORTIFY_SOURCE to the brstack CFLAGS, as the main perf flags
set it and it requires building with optimization, and this new test has
a -O0.

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/20221116233854.1596378-10-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e011979e

tools/perf/tests/builtin-test.c

+1 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ static struct test_workload *workloads[] = { 
	&workload__thloop,

	&workload__leafloop,

	&workload__sqrtloop,

	&workload__brstack,

};



static int num_subtests(const struct test_suite *t)

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -204,5 +204,6 @@ DECLARE_WORKLOAD(noploop); 
DECLARE_WORKLOAD(thloop);

DECLARE_WORKLOAD(leafloop);

DECLARE_WORKLOAD(sqrtloop);

DECLARE_WORKLOAD(brstack);



#endif /* TESTS_H */

tools/perf/tests/workloads/Build

+2 −0
Original line number Diff line number Diff line
@@ -4,6 +4,8 @@ perf-y += noploop.o 
perf-y += thloop.o

perf-y += leafloop.o

perf-y += sqrtloop.o

perf-y += brstack.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_brstack.o          = -g -O0 -fno-inline -U_FORTIFY_SOURCE

tools/perf/tests/workloads/brstack.c

0 → 100644
+40 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#include <stdlib.h>

#include "../tests.h"



#define BENCH_RUNS 999999



static volatile int cnt;



static void brstack_bar(void) {

}				/* return */



static void brstack_foo(void) {

	brstack_bar();		/* call */

}				/* return */



static void brstack_bench(void) {

	void (*brstack_foo_ind)(void) = brstack_foo;



	if ((cnt++) % 3)	/* branch (cond) */

		brstack_foo();	/* call */

	brstack_bar();		/* call */

	brstack_foo_ind();	/* call (ind) */

}



static int brstack(int argc, const char **argv)

{

	int num_loops = BENCH_RUNS;



	if (argc > 0)

		num_loops = atoi(argv[0]);



	while (1) {

		if ((cnt++) > num_loops)

			break;

		brstack_bench();/* call */

	}			/* branch (uncond) */

	return 0;

}



DEFINE_WORKLOAD(brstack);