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: 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>

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 0ed5ac4..9acb7a9 100644 (file)
--- 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 86804dd..18c4031 100644 (file)
--- 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 03dc675..2312a33 100644 (file)
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -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

diff --git a/tools/perf/tests/workloads/sqrtloop.c b/tools/perf/tests/workloads/sqrtloop.c
new file mode 100644 (file)
index 0000000..ccc94c6
--- /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)
+               (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);