On Fri, 2009-01-09 at 11:44 -0500, Steven Rostedt wrote:
> When we get to the schedule() it then needs to be a:
>
> preempt_enable_no_resched();
> schedule();
On that note:
Index: linux-2.6/kernel/mutex.c
===================================================================
--- linux-2.6.orig/kernel/mutex.c
+++ linux-2.6/kernel/mutex.c
@@ -220,7 +220,9 @@ __mutex_lock_common(struct mutex *lock,
__set_task_state(task, state);
/* didnt get the lock, go to sleep: */
+ preempt_disable();
spin_unlock_mutex(&lock->wait_lock, flags);
+ preempt_enable_no_resched();
schedule();
spin_lock_mutex(&lock->wait_lock, flags);
}
actually improves mutex performance on PREEMPT=y
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