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Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Zephyr 1.12 removed the old scheduler and replaced it with the choice
of a "dumb" list or a balanced tree. But the old multi-queue
algorithm is still useful in the space between these two (applications
with large-ish numbers of runnable threads, but that don't need fancy
features like EDF or SMP affinity). So add it as a
CONFIG_SCHED_MULTIQ option.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This replaces the existing scheduler (but not priority handling)
implementation with a somewhat simpler one. Behavior as to thread
selection does not change. New features:
+ Unifies SMP and uniprocessing selection code (with the sole
exception of the "cache" trick not being possible in SMP).
+ The old static multi-queue implementation is gone and has been
replaced with a build-time choice of either a "dumb" list
implementation (faster and significantly smaller for apps with only
a few threads) or a balanced tree queue which scales well to
arbitrary numbers of threads and priority levels. This is
controlled via the CONFIG_SCHED_DUMB kconfig variable.
+ The balanced tree implementation is usable symmetrically for the
wait_q abstraction, fixing a scalability glitch Zephyr had when many
threads were waiting on a single object. This can be selected via
CONFIG_WAITQ_FAST.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Flavio Ceolin