rtems - RTEMS Kernel, file-systems, drivers, BSPs, samples, and testsuite.

	Commit message (Collapse)	Author	Age	Files	Lines
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*	Change all references of rtems.com to rtems.org.	Chris Johns	2014-03-21	1	-1/+1
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*	smp: Generalize Simple SMP scheduler	Sebastian Huber	2013-08-20	1	-85/+75
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*	smp: Optimize Simple SMP scheduler	Sebastian Huber	2013-08-20	1	-33/+104
\| \| \| \| \| \| \| \| \| \|	Add Thread_Control::is_in_the_air field if configured for SMP. This helps to simplify the extract operation and avoids superfluous inter-processor interrupts. Move the processor allocation step into the enqueue operation. Add and use _Scheduler_simple_smp_Get_highest_ready(). Add and use _Scheduler_SMP_Get_lowest_scheduled().
*	smp: _Scheduler_simple_smp_Allocate_processor()	Sebastian Huber	2013-08-20	1	-44/+2
\| \| \| \| \|	Rename _Scheduler_simple_smp_Allocate_processor() to _Scheduler_SMP_Allocate_processor().
*	smp: Rename _Scheduler_simple_smp_Start_idle()	Sebastian Huber	2013-08-20	1	-12/+0
\| \| \| \| \|	Rename _Scheduler_simple_smp_Start_idle() to _Scheduler_SMP_Start_idle().
*	smp: Replace Scheduler_simple_smp_Control	Sebastian Huber	2013-08-20	1	-13/+9
\| \| \| \| \|	Replace Scheduler_simple_smp_Control with Scheduler_SMP_Control. Rename _Scheduler_simple_smp_Instance() to _Scheduler_SMP_Instance().
*	score: PR2136: Fix _Thread_Change_priority()	Sebastian Huber	2013-08-20	1	-2/+2
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Add call to _Scheduler_Schedule() in missing path after _Thread_Set_transient() in _Thread_Change_priority(). See also sptests/spintrcritical19. Add thread parameter to _Scheduler_Schedule(). This parameter is currently unused but may be used in future SMP schedulers. Do heir selection in _Scheduler_Schedule(). Use _Scheduler_Update_heir() for this in the particular scheduler implementation. Add and use _Scheduler_Generic_block().
*	score: Per-CPU thread dispatch disable level	Sebastian Huber	2013-08-09	1	-0/+10
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Use a per-CPU thread dispatch disable level. So instead of one global thread dispatch disable level we have now one instance per processor. This is a major performance improvement for SMP. On non-SMP configurations this may simplifiy the interrupt entry/exit code. The giant lock is still present, but it is now decoupled from the thread dispatching in _Thread_Dispatch(), _Thread_Handler(), _Thread_Restart_self() and the interrupt entry/exit. Access to the giant lock is now available via _Giant_Acquire() and _Giant_Release(). The giant lock is still implicitly acquired via _Thread_Dispatch_decrement_disable_level(). The giant lock is only acquired for high-level operations in interrupt handlers (e.g. release of a semaphore, sending of an event). As a side-effect this change fixes the lost thread dispatch necessary indication bug in _Thread_Dispatch(). A per-CPU thread dispatch disable level greatly simplifies the SMP support for the interrupt entry/exit code since no spin locks have to be acquired in this area. It is only necessary to get the current processor index and use this to calculate the address of the own per-CPU control. This reduces the interrupt latency considerably. All elements for the interrupt entry/exit code are now part of the Per_CPU_Control structure: thread dispatch disable level, ISR nest level and thread dispatch necessary. Nothing else is required (except CPU port specific stuff like on SPARC).
*	smp: Delete _SMP_Request_other_cores_to_dispatch()	Sebastian Huber	2013-07-30	1	-0/+6
\| \| \| \| \|	Use an event triggered unicast to inform remote processors about a necessary thread dispatch instead.
*	score: Create schedulerpriority impl header	Sebastian Huber	2013-07-26	1	-0/+1
\| \| \| \| \| \| \| \| \| \| \| \| \|	Move implementation specific parts of schedulerpriority.h and schedulerpriority.inl into new header file schedulerpriorityimpl.h. The schedulerpriority.h contains now only the application visible API. Add missing includes. Remove superfluous includes. Move declaration of _Priority_Bit_map to prioritybitmap.inl since this variable is used only here. Remove second declaration of _Priority_Major_bit_map.
*	score: Create schedulersimple impl header	Sebastian Huber	2013-07-26	1	-0/+1
\| \| \| \| \| \|	Move implementation specific parts of schedulersimple.h and schedulersimple.inl into new header file schedulersimpleimpl.h. The schedulersimple.h contains now only the application visible API.
*	scheduler: New simple SMP scheduler implementation	Sebastian Huber	2013-06-14	1	-0/+182
	The new Simple SMP Scheduler allocates a processor for the processor count highest priority ready threads. The thread priority and position in the ready chain are the only information to determine the scheduling decision. Threads with an allocated processor are in the scheduled chain. After initialization the scheduled chain has exactly processor count nodes. Each processor has exactly one allocated thread after initialization. All enqueue and extract operations may exchange threads with the scheduled chain. One thread will be added and another will be removed. The scheduled and ready chain is ordered according to the thread priority order. The chain insert operations are O(count of ready threads), thus this scheduler is unsuitable for most real-time applications. The thread preempt mode will be ignored.