Changeset acf37bc in mainline for kernel/generic/src/udebug/udebug.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/udebug/udebug.c (modified) (2 diffs)

kernel/generic/src/udebug/udebug.c

@@ -99 +99 @@
 }
 
-/** Do a preliminary check that a debugging session is in progress.
- * 
- * This only requires the THREAD->udebug.lock mutex (and not TASK->udebug.lock
- * mutex). For an undebugged task, this will never block (while there could be
- * collisions by different threads on the TASK mutex), thus improving SMP
- * perormance for undebugged tasks.
- *
- * @return      True if the thread was in a debugging session when the function
- *              checked, false otherwise.
- */
-static bool udebug_thread_precheck(void)
-{
-        bool res;
-
-        mutex_lock(&THREAD->udebug.lock);
-        res = THREAD->udebug.active;
-        mutex_unlock(&THREAD->udebug.lock);
-
-        return res;
-}
-
 /** Start of stoppable section.
  *
@@ -245 +224 @@
 
         etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B;
-
-        /* Early check for undebugged tasks */
-        if (!udebug_thread_precheck()) {
-                return;
-        }
 
         mutex_lock(&TASK->udebug.lock);