Changeset acf37bc in mainline for kernel/generic/src/syscall/syscall.c

Timestamp:

2009-05-15T20:22:26Z (16 years ago)

Author:

Jiri Svoboda <jirik.svoboda@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

687246b

Parents:

40a0e504

Message:

Reduce Udebug overhead with some nifty tricks.

File:

• kernel/generic/src/syscall/syscall.c (modified) (2 diffs)

kernel/generic/src/syscall/syscall.c

@@ -60 +60 @@
 {
         unative_t rc;
+
+#ifdef CONFIG_UDEBUG
+        bool debug;
+
+        /*
+         * Early check for undebugged tasks. We do not lock anything as this
+         * test need not be precise in either way.
+         */
+        debug = THREAD->udebug.active;
         
-#ifdef CONFIG_UDEBUG
-        udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, 0, false);
+        if (debug) {
+                udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, 0, false);
+        }
 #endif
         
@@ -77 +87 @@
         
 #ifdef CONFIG_UDEBUG
-        udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, rc, true);
+        if (debug) {
+                udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, rc, true);
         
-        /*
-         * Stopping point needed for tasks that only invoke non-blocking
-         * system calls.
-         */
-        udebug_stoppable_begin();
-        udebug_stoppable_end();
+                /*
+                 * Stopping point needed for tasks that only invoke
+                 * non-blocking system calls. Not needed if the task
+                 * is not being debugged (it cannot block here).
+                 */
+                udebug_stoppable_begin();
+                udebug_stoppable_end();
+        }
 #endif