[smart] add CPU usage tracing config

This patch introduces following features:

- Added CPU usage tracing functionality, enabled by default, for
  applications like 'top'.

Signed-off-by: Shell <[email protected]>

Author: polarvid

components/lwp/Kconfig

@@ -12,9 +12,9 @@ if RT_USING_LWP
 
     if LWP_DEBUG
         config LWP_DEBUG_INIT
-        select RT_USING_HOOKLIST
-        bool "Enable debug mode of init process"
-        default n
+            select RT_USING_HOOKLIST
+            bool "Enable debug mode of init process"
+            default n
     endif
 
     config RT_LWP_MAX_NR
@@ -33,6 +33,13 @@ if RT_USING_LWP
         int "The input buffer size of lwp console device"
         default 1024
 
+    config LWP_TRACING_CPU_USAGE
+        select RT_USING_HOOK
+        bool "Enable cpu usage tracing"
+        help
+            Enable cpu usage tracing for application like top.
+        default y
+
     config LWP_TID_MAX_NR
         int "The maximum number of lwp thread id"
         default 64

components/lwp/lwp.c

@@ -67,7 +67,7 @@ extern char working_directory[];
  *        It's always recommended to scratch the console from the boot arguments.
  *        And dont forget to register the device with a higher priority.
  */
-static rt_err_t lwp_default_console_setup(void)
+static rt_err_t _default_console_setup(void)
 {
     rt_device_t bakdev = rt_device_find("ttyS0");
     rt_err_t rc;
@@ -85,6 +85,15 @@ static rt_err_t lwp_default_console_setup(void)
     return rc;
 }
 
+void rt_update_process_times(void);
+static int _set_usage_hook(void)
+{
+#ifdef LWP_TRACING_CPU_USAGE
+    rt_tick_sethook(rt_update_process_times);
+#endif /* LWP_TRACING_CPU_USAGE */
+    return RT_EOK;
+}
+
 static int lwp_component_init(void)
 {
     int rc;
@@ -104,9 +113,13 @@ static int lwp_component_init(void)
     {
         LOG_E("%s: lwp_futex_init() failed", __func__);
     }
-    else if ((rc = lwp_default_console_setup()) != RT_EOK)
+    else if ((rc = _set_usage_hook()) != RT_EOK)
+    {
+        LOG_E("%s: _set_usage_hook() failed", __func__);
+    }
+    else if ((rc = _default_console_setup()) != RT_EOK)
     {
-        LOG_E("%s: lwp_default_console_setup() failed", __func__);
+        LOG_E("%s: _default_console_setup() failed", __func__);
     }
     return rc;
 }