Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

choice
        prompt "Preemption Model"
        default PREEMPT_NONE

config PREEMPT_NONE
        bool "No Forced Preemption (Server)"
        help
          This is the traditional Linux preemption model, geared towards
          throughput. It will still provide good latencies most of the
          time, but there are no guarantees and occasional longer delays
          are possible.

          Select this option if you are building a kernel for a server or
          scientific/computation system, or if you want to maximize the
          raw processing power of the kernel, irrespective of scheduling
          latencies.

config PREEMPT_VOLUNTARY
        bool "Voluntary Kernel Preemption (Desktop)"
        help
          This option reduces the latency of the kernel by adding more
          "explicit preemption points" to the kernel code. These new
          preemption points have been selected to reduce the maximum
          latency of rescheduling, providing faster application reactions,
          at the cost of slightly lower throughput.

          This allows reaction to interactive events by allowing a
          low priority process to voluntarily preempt itself even if it
          is in kernel mode executing a system call. This allows
          applications to run more 'smoothly' even when the system is
          under load.

          Select this if you are building a kernel for a desktop system.

config PREEMPT
        bool "Preemptible Kernel (Low-Latency Desktop)"
        help
          This option reduces the latency of the kernel by making
          all kernel code (that is not executing in a critical section)
          preemptible.  This allows reaction to interactive events by
          permitting a low priority process to be preempted involuntarily
          even if it is in kernel mode executing a system call and would
          otherwise not be about to reach a natural preemption point.
          This allows applications to run more 'smoothly' even when the
          system is under load, at the cost of slightly lower throughput
          and a slight runtime overhead to kernel code.

          Select this if you are building a kernel for a desktop or
          embedded system with latency requirements in the milliseconds
          range.

endchoice

config PREEMPT_BKL
        bool "Preempt The Big Kernel Lock"
        depends on SMP || 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.