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CONFIG_WAITQ_SCALABLE¶
Use scalable wait_q implementation
Type: bool
Help¶
When selected, the wait_q will be implemented with a balanced tree. Choose this if you expect to have many threads waiting on individual primitives. There is a ~2kb code size increase over WAITQ_DUMB (which may be shared with SCHED_SCALABLE) if the rbtree is not used elsewhere in the application, and pend/unpend operations on “small” queues will be somewhat slower (though this is not generally a performance path).
Direct dependencies¶
<choice WAITQ_ALGORITHM: Wait queue priority algorithm>
(Includes any dependencies from if’s and menus.)
Kconfig definition¶
At kernel/Kconfig:274
Included via Kconfig:10 → Kconfig.zephyr:31
Menu path: (top menu) → General Kernel Options → Wait queue priority algorithm
config WAITQ_SCALABLE
bool
prompt "Use scalable wait_q implementation" if <choice WAITQ_ALGORITHM: Wait queue priority algorithm>
depends on <choice WAITQ_ALGORITHM: Wait queue priority algorithm>
help
When selected, the wait_q will be implemented with a
balanced tree. Choose this if you expect to have many
threads waiting on individual primitives. There is a ~2kb
code size increase over WAITQ_DUMB (which may be shared with
SCHED_SCALABLE) if the rbtree is not used elsewhere in the
application, and pend/unpend operations on "small" queues
will be somewhat slower (though this is not generally a
performance path).
(Definitions include propagated dependencies, including from if’s and menus.)