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kernel: work_q: Document implications of default sys work_q priority

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Default value of CONFIG_SYSTEM_WORKQUEUE_PRIORITY is -1, which means
it's run by the cooperative thread. Explicitly mention (in the Kconfig
help) that it means that any work handler submited to this default
queue won't be preempted by some other thread (which is generally
good, but worth documenting explicitly).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
This commit is contained in:
Paul Sokolovsky 2018-06-07 16:58:11 +03:00 • committed by Anas Nashif
commit fd55935560
1 changed files with 4 additions and 0 deletions
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kernel/Kconfig
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@ -330,6 +330,10 @@ config SYSTEM_WORKQUEUE_PRIORITY
default -1
default 0 if !COOP_ENABLED
default -2 if COOP_ENABLED && !PREEMPT_ENABLED
help
By default, system work queue priority is the lowest cooperative
priority. This means that any work handler, once started, won't
be preempted by any other thread until finished.
config OFFLOAD_WORKQUEUE_STACK_SIZE
int "Workqueue stack size for thread offload requests"