Kconfig.preempt

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    1 
    2 choice
    3         prompt "Preemption Model"
    4         default PREEMPT_NONE
    5 
    6 config PREEMPT_NONE
    7         bool "No Forced Preemption (Server)"
    8         help
    9           This is the traditional Linux preemption model, geared towards
   10           throughput. It will still provide good latencies most of the
   11           time, but there are no guarantees and occasional longer delays
   12           are possible.
   13 
   14           Select this option if you are building a kernel for a server or
   15           scientific/computation system, or if you want to maximize the
   16           raw processing power of the kernel, irrespective of scheduling
   17           latencies.
   18 
   19 config PREEMPT_VOLUNTARY
   20         bool "Voluntary Kernel Preemption (Desktop)"
   21         help
   22           This option reduces the latency of the kernel by adding more
   23           "explicit preemption points" to the kernel code. These new
   24           preemption points have been selected to reduce the maximum
   25           latency of rescheduling, providing faster application reactions,
   26           at the cost of slightly lower throughput.
   27 
   28           This allows reaction to interactive events by allowing a
   29           low priority process to voluntarily preempt itself even if it
   30           is in kernel mode executing a system call. This allows
   31           applications to run more 'smoothly' even when the system is
   32           under load.
   33 
   34           Select this if you are building a kernel for a desktop system.
   35 
   36 config PREEMPT
   37         bool "Preemptible Kernel (Low-Latency Desktop)"
   38         select PREEMPT_COUNT
   39         select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
   40         help
   41           This option reduces the latency of the kernel by making
   42           all kernel code (that is not executing in a critical section)
   43           preemptible.  This allows reaction to interactive events by
   44           permitting a low priority process to be preempted involuntarily
   45           even if it is in kernel mode executing a system call and would
   46           otherwise not be about to reach a natural preemption point.
   47           This allows applications to run more 'smoothly' even when the
   48           system is under load, at the cost of slightly lower throughput
   49           and a slight runtime overhead to kernel code.
   50 
   51           Select this if you are building a kernel for a desktop or
   52           embedded system with latency requirements in the milliseconds
   53           range.
   54 
   55 endchoice
   56 
   57 config PREEMPT_COUNT
   58        bool

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FreeBSD/Linux Kernel Cross Reference sys/kernel/Kconfig.preempt

FreeBSD/Linux Kernel Cross Reference
sys/kernel/Kconfig.preempt