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Linux/kernel/Kconfig.preempt

  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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