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 ifs and menus.)

Kconfig definition

At <Zephyr Kernel>/Kconfig:270

Included via Kconfig:8 → Kconfig.zephyr:40

Menu path: (Top) → General Kernel Options → Wait queue priority algorithm

config WAITQ_SCALABLE
    bool "Use scalable wait_q implementation"
    depends on <choice WAITQ_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).

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)