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Clustered/partitioned scheduling helps to control the worst-case
latencies in the system. The goal is to reduce the amount of shared
state in the system and thus prevention of lock contention. Modern
multi-processor systems tend to have several layers of data and
instruction caches. With clustered/partitioned scheduling it is
possible to honour the cache topology of a system and thus avoid
expensive cache synchronization traffic.
We have clustered scheduling in case the set of processors of a system
is partitioned into non-empty pairwise-disjoint subsets. These subsets
are called clusters. Clusters with a cardinality of one are partitions.
Each cluster is owned by exactly one scheduler instance.
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Do not allocate the scheduler control structures from the workspace.
This is a preparation step for configuration of clustered/partitioned
schedulers on SMP.
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Use the Configuration instead.
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Scheduler operations must be free of a global scheduler context to
enable partitioned/clustered scheduling.
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Add and use _Per_CPU_Get_by_index() and _Per_CPU_Get_index(). Add
_Per_CPU_Send_interrupt(). This avoids direct access of
_Per_CPU_Information.
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Move implementation specific parts of thread.h and thread.inl into new
header file threadimpl.h. The thread.h contains now only the
application visible API.
Remove superfluous header file includes from various files.
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Move implementation specific parts of scheduler.h and scheduler.inl into
new header file schedulerimpl.h. The scheduler.h contains now only the
application visible API.
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Delete _Scheduler_priority_Tick(). Use _SMP_Get_processor_count() for
default tick operation. Delete _Scheduler_simple_smp_Tick().
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