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menu "General setup"
config SMP
bool "Multiprocessor support"
default y
---help---
Enable support for machines with multiple processors.
config MAX_CPUS
int "Maximum number of supported CPUs" if SMP
range 2 512 if SMP
default "1" if !SMP
default "128" if SMP
---help---
Maximum number of supported processors.
config CLOCK_FREQ
int "Low resolution clock frequency"
range 100 1000
default 200
---help---
The low resolution clock frequency determines how often low
resolution clocks interrupt processors. These clocks drive
the timer system. Low values increase throughput and latencies,
whereas high values reduce throughput and latencies.
The value must be usable as an integer divisor for 1000, with
no remainder.
Recommended values are 100 for throughput, 1000 for low
latencies, and 200 or 250 for a good balance between throughput
and latencies.
choice
prompt "Mutex implementation"
default MUTEX_PLAIN
---help---
A mutex is a sleeping synchronization object used throughout the
kernel and available to kernel applications. As a result, this
option affects all mutex users.
If in doubt, choose the plain implementation.
config MUTEX_ADAPTIVE
bool "Adaptive spinning mutex"
---help---
Adaptive spinning mutex, spinning instead of sleeping if the owner
is running, in the hope the critical section is short and the mutex
will be unlocked soon, to avoid expensive sleep/wakeup operations.
This implementation should improve overall performance at the cost
of increased latencies.
config MUTEX_PI
bool "Mutex with priority inheritance"
---help---
Real-time mutex with priority inheritance. This implementation
should improve latencies at the cost of overall performance.
config MUTEX_PLAIN
bool "Plain mutex"
---help---
Default implementation, immediately sleeping on contention.
endchoice
config SHELL
bool "Embedded shell"
default n
---help---
Enable the embedded shell.
The embedded shell is mostly used for diagnostics.
config THREAD_STACK_GUARD
bool "Thread stack guard pages"
---help---
Enable the use of guard pages around kernel thread stacks to catch
overflows. Note that this feature wastes precious kernel virtual
memory and has some overhead during thread creation and destruction.
If unsure, disable.
endmenu
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