sched/gprof: add gprof support

gprof can analyze code hot spots based on scheduled sampling.
After adding the "-pg" parameter when compiling, you can view the code call graph.

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

include/sys/gmon.h

@@ -0,0 +1,54 @@
+/****************************************************************************
+ * include/sys/gmon.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_SYS_GMON_H
+#define __INCLUDE_SYS_GMON_H
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/* Start/stop profiling */
+
+void moncontrol(int mode);
+
+/* Set up data structures and start profiling. */
+
+void monstartup(unsigned long lowpc, unsigned long highpc);
+
+/* Clean up profiling and write out gmon.out. */
+
+void _mcleanup(void);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __INCLUDE_SYS_GMON_H */