perf test: Add timeout to datasym workload

Unlike others it has an infinite loop that make it annoying to call.
Make it finish after 1 second and handle command-line argument to change
the setting.

Reviewed-by: Leo Yan <leo.yan@arm.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20250304022837.1877845-6-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/tests/workloads/datasym.c

@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
 #include <linux/compiler.h>
 #include "../tests.h"
 
@@ -12,9 +15,25 @@ static buf buf1 = {
 	.reserved[0] = 1,
 };
 
-static int datasym(int argc __maybe_unused, const char **argv __maybe_unused)
+static volatile sig_atomic_t done;
+
+static void sighandler(int sig __maybe_unused)
 {
-	for (;;) {
+	done = 1;
+}
+
+static int datasym(int argc, const char **argv)
+{
+	int sec = 1;
+
+	if (argc > 0)
+		sec = atoi(argv[0]);
+
+	signal(SIGINT, sighandler);
+	signal(SIGALRM, sighandler);
+	alarm(sec);
+
+	while (!done) {
 		buf1.data1++;
 		if (buf1.data1 == 123) {
 			/*