config PREEMPT
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bool
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select PREEMPT_COUNT
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config PREEMPT_RT_BASE
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bool
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select PREEMPT
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config PREEMPT_RT
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bool
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config HAVE_PREEMPT_LAZY
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bool
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config PREEMPT_LAZY
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def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
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choice
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prompt "Preemption Model"
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default PREEMPT_NONE
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config PREEMPT_NONE
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bool "No Forced Preemption (Server)"
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help
|
This is the traditional Linux preemption model, geared towards
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throughput. It will still provide good latencies most of the
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time, but there are no guarantees and occasional longer delays
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are possible.
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Select this option if you are building a kernel for a server or
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scientific/computation system, or if you want to maximize the
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raw processing power of the kernel, irrespective of scheduling
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latencies.
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config PREEMPT_VOLUNTARY
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bool "Voluntary Kernel Preemption (Desktop)"
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depends on !ARCH_NO_PREEMPT
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help
|
This option reduces the latency of the kernel by adding more
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"explicit preemption points" to the kernel code. These new
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preemption points have been selected to reduce the maximum
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latency of rescheduling, providing faster application reactions,
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at the cost of slightly lower throughput.
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This allows reaction to interactive events by allowing a
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low priority process to voluntarily preempt itself even if it
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is in kernel mode executing a system call. This allows
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applications to run more 'smoothly' even when the system is
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under load.
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Select this if you are building a kernel for a desktop system.
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config PREEMPT__LL
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bool "Preemptible Kernel (Low-Latency Desktop)"
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depends on !ARCH_NO_PREEMPT
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select PREEMPT
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select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
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help
|
This option reduces the latency of the kernel by making
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all kernel code (that is not executing in a critical section)
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preemptible. This allows reaction to interactive events by
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permitting a low priority process to be preempted involuntarily
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even if it is in kernel mode executing a system call and would
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otherwise not be about to reach a natural preemption point.
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This allows applications to run more 'smoothly' even when the
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system is under load, at the cost of slightly lower throughput
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and a slight runtime overhead to kernel code.
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Select this if you are building a kernel for a desktop or
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embedded system with latency requirements in the milliseconds
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range.
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config PREEMPT_RTB
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bool "Preemptible Kernel (Basic RT)"
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select PREEMPT_RT_BASE
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help
|
This option is basically the same as (Low-Latency Desktop) but
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enables changes which are preliminary for the full preemptible
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RT kernel.
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config PREEMPT_RT_FULL
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bool "Fully Preemptible Kernel (RT)"
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depends on IRQ_FORCED_THREADING
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select PREEMPT_RT_BASE
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select PREEMPT_RCU
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select PREEMPT_RT
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help
|
All and everything
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endchoice
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config PREEMPT_COUNT
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bool
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