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kernel: update SCHED_CPU_MASK Kconfig doc

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Fix reference to APIs and reformat kconfig help message.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This commit is contained in:
Anas Nashif 2019-12-18 18:10:09 -05:00
commit 8d2675010a
1 changed files with 12 additions and 13 deletions
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kernel/Kconfig
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@ -126,20 +126,19 @@ config SCHED_CPU_MASK
bool "Enable CPU mask affinity/pinning API"
depends on SCHED_DUMB
help
When true, the app will have access to the
z_thread_*_cpu_mask() APIs which control per-CPU affinity
masks in SMP mode, allowing apps to pin threads to specific
CPUs or disallow threads from running on given CPUs. Note
that as currently implemented, this involves an inherent
O(N) scaling in the number of idle-but-runnable threads, and
thus works only with the DUMB scheduler (as SCALABLE and
MULTIQ would see no benefit).
When true, the application will have access to the
k_thread_cpu_mask_*() APIs which control per-CPU affinity masks in
SMP mode, allowing applications to pin threads to specific CPUs or
disallow threads from running on given CPUs. Note that as currently
implemented, this involves an inherent O(N) scaling in the number of
idle-but-runnable threads, and thus works only with the DUMB
scheduler (as SCALABLE and MULTIQ would see no benefit).
Note that this setting does not technically depend on SMP
and is implemented without it for testing purposes, but for
obvious reasons makes sense as an application API only where
there is more than one CPU. With one CPU, it's just a
higher overhead version of k_thread_start/stop().
Note that this setting does not technically depend on SMP and is
implemented without it for testing purposes, but for obvious reasons
makes sense as an application API only where there is more than one
CPU. With one CPU, it's just a higher overhead version of
k_thread_start/stop().
config MAIN_STACK_SIZE
int "Size of stack for initialization and main thread"