Added a syscall timing utility, similar to the one in NewOS.

Can also be run under R5 when TARGET_PLATFORM=r5 for comparison.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12567 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/kernel/core/Jamfile

@@ -2,10 +2,20 @@ SubDir OBOS_TOP src tests kernel core ;
 
 UsePrivateHeaders kernel ;
 
+if $(TARGET_PLATFORM) = r5 {
+	LIBROOT = root ;
+} else {
+	LIBROOT = libroot.so ;
+}
+
 SimpleTest transfer_area_test :
 	transfer_area_test.cpp
 	: libroot.so ;
 
+SimpleTest syscall_time :
+	syscall_time.cpp
+	: $(LIBROOT) ;
+
 SubInclude OBOS_TOP src tests kernel core cache ;
 #SubInclude OBOS_TOP src tests kernel core disk_device_manager ;
 SubInclude OBOS_TOP src tests kernel core util ;

src/tests/kernel/core/syscall_time.cpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2005, Axel Dörfler, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <OS.h>
+#include <stdio.h>
+
+#ifdef __HAIKU__
+#	include <syscalls.h>
+#else
+extern "C" void _kclose_(int fd);
+#endif
+
+
+int
+main(int argc, char **argv)
+{
+	const int32 loops = 100000;
+	bigtime_t startTime = system_time();
+
+	for (int32 i = 0; i < loops; i++) {
+#ifdef __HAIKU__
+//		_kern_null();
+		_kern_close(-1);
+#else
+		_kclose_(-1);
+#endif
+	}
+
+	bigtime_t runTime = system_time() - startTime;
+
+	// empty loop time
+
+	startTime = system_time();
+
+	for (int32 i = 0; i < loops; i++)
+		;
+
+	runTime -= system_time() - startTime;
+
+	printf("%f usecs/syscall\n", 1.0 * runTime / loops);
+	return 0;
+}