From d37adfe5dd82cc3c933eb521b8f800c342af0e52 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Thu, 3 Mar 2016 07:02:03 +0100 Subject: score: Fix CPU time used by executing threads The CPU time used of a thread was previously maintained per-processor mostly during _Thread_Dispatch(). However, on SMP configurations the actual processor of a thread is difficult to figure out since thread dispatching is a highly asynchronous process (e.g. via inter-processor interrupts). Only the intended processor of a thread is known to the scheduler easily. Do the CPU usage accounting during thread heir updates in the context of the scheduler operations. Provide the function _Thread_Get_CPU_time_used() to get the CPU usage of a thread using proper locks to get a consistent value. Close #2627. --- cpukit/score/src/schedulersmpstartidle.c | 1 + 1 file changed, 1 insertion(+) (limited to 'cpukit/score/src/schedulersmpstartidle.c') diff --git a/cpukit/score/src/schedulersmpstartidle.c b/cpukit/score/src/schedulersmpstartidle.c index de125d3323..0ffb628550 100644 --- a/cpukit/score/src/schedulersmpstartidle.c +++ b/cpukit/score/src/schedulersmpstartidle.c @@ -22,6 +22,7 @@ void _Scheduler_SMP_Start_idle( Scheduler_SMP_Context *self = _Scheduler_SMP_Get_self( context ); Scheduler_SMP_Node *node = _Scheduler_SMP_Thread_get_node( thread ); + _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_SCHEDULED ); node->state = SCHEDULER_SMP_NODE_SCHEDULED; _Thread_Set_CPU( thread, cpu ); -- cgit v1.2.3