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

Michal Hocko
2020-10-09T11:26:47Z

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