Merge pull request torvalds#219 from opurdila/small-fixes

Small fixes and enhancements

Author: Octavian Purdila

tools/lkl/lib/nt-host.c

@@ -84,7 +84,7 @@ static void thread_exit(void)
 static int thread_join(lkl_thread_t tid)
 {
 	/* TODO: error handling */
-	WaitForSingleObject(tid, INFINITE);
+	WaitForSingleObject((void *)tid, INFINITE);
 	return 0;
 }
 

tools/lkl/lib/posix-host.c

@@ -223,11 +223,11 @@ static void *tls_get(unsigned int key)
 
 static unsigned long long time_ns(void)
 {
-	struct timeval tv;
+	struct timespec ts;
 
-	gettimeofday(&tv, NULL);
+	clock_gettime(CLOCK_MONOTONIC, &ts);
 
-	return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000ULL;
+	return 1e9*ts.tv_sec + ts.tv_nsec;
 }
 
 static void *timer_alloc(void (*fn)(void *), void *arg)

tools/lkl/tests/boot.c

@@ -112,6 +112,59 @@ int test_getpid(char *str, int len)
 	return TEST_FAILURE;
 }
 
+void check_latency(long (*f)(void), long *min, long *max, long *avg)
+{
+	int i;
+	unsigned long long start, stop, sum = 0;
+	static const int count = 1000;
+	long delta;
+
+	*min = 1000000000;
+	*max = -1;
+
+	for (i = 0; i < count; i++) {
+		start = lkl_host_ops.time();
+		f();
+		stop = lkl_host_ops.time();
+		delta = stop - start;
+		if (*min > delta)
+			*min = delta;
+		if (*max < delta)
+			*max = delta;
+		sum += delta;
+	}
+	*avg = sum / count;
+}
+
+static long native_getpid(void)
+{
+#ifdef __MINGW32__
+	GetCurrentProcessId();
+#else
+	getpid();
+#endif
+	return 0;
+}
+
+int test_syscall_latency(char *str, int len)
+{
+	long min, max, avg;
+	int tmp;
+
+	check_latency(lkl_sys_getpid, &min, &max, &avg);
+
+	tmp = snprintf(str, len, "avg/min/max lkl: %ld/%ld/%ld ",
+		       avg, min, max);
+	str += tmp;
+	len -= tmp;
+
+	check_latency(native_getpid, &min, &max, &avg);
+
+	snprintf(str, len, "native: %ld/%ld/%ld", avg, min, max);
+
+	return TEST_SUCCESS;
+}
+
 #define access_rights 0721
 
 int test_creat(char *str, int len)
@@ -676,6 +729,7 @@ static void test_thread(void *data)
 		fprintf(stderr, "%s: %s\n", __func__, lkl_strerror(ret));
 	}
 
+	lkl_stop_syscall_thread();
 }
 
 static int test_syscall_thread(char *str, int len)
@@ -817,9 +871,10 @@ int main(int argc, char **argv)
 	if (cla.tap_ifname)
 		TEST(netdev_add);
 #endif /* __MINGW32__ */
-	lkl_start_kernel(&lkl_host_ops, 16 * 1024 * 1024, "");
+	lkl_start_kernel(&lkl_host_ops, 16 * 1024 * 1024, "loglevel=8");
 
 	TEST(getpid);
+	TEST(syscall_latency);
 	TEST(umask);
 	TEST(creat);
 	TEST(close);

tools/lkl/tests/test.h

@@ -16,5 +16,6 @@ static int g_test_pass = 0;
 								\
 	printf("%-20s %s [%s]\n", #name,			\
 	       ret == TEST_SUCCESS ? "passed" : "failed", str);	\
+	fflush(stdout);						\
 }