Re: [RFC PATCH] kernel: allow to configure PREEMPT_NONE, PREEMPT_VOLUNTARY on kernel command line

[Michal Hocko]

On Fri 09-10-20 13:17:04, Michal Hocko wrote:
[...]
> +config PREEMPT_DYNAMIC
> +	bool "Allow boot time preemption model selection"

	depends on !ARCH_NO_PREEMPT

> +	depends on PREEMPT_NONE || PREEMPT_VOLUNTARY
> +	help
> +	  This option allows to define the preemption model on the kernel
> +	  command line parameter and thus override the default preemption
> +	  model defined during compile time.
> +
> +	  The feature is primarily interesting for Linux distributions which
> +	  provide a pre-built kernel binary to reduce the number of kernel
> +	  flavors they offer while still offering different usecases.
> +
> +	  The runtime overhead is negligible with JUMP_LABELS enabled but if
> +	  runtime patching is not available for the specific architecture then
> +	  the potential overhead should be considered.
> +
> +	  Select if you the same pre-built kernel should be used for both Server
> +	  and Desktop workloads.
> +
>  config PREEMPT_COUNT
>         bool
-- 
Michal Hocko
SUSE Labs