linux/kernel/Kconfig.preempt

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config PREEMPT
bool "Preemptible Kernel"
help
This option reduces the latency of the kernel when reacting to
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.
This allows applications to run more reliably even when the system is
under load.
Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.
config PREEMPT_BKL
bool "Preempt The Big Kernel Lock"
depends on PREEMPT
default y
help
This option reduces the latency of the kernel by making the
big kernel lock preemptible.
Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.