| Kconfig.preempt (ecb41832bd2a7a3f8ac93527cec5e51e3827daed) | Kconfig.preempt (a50a3f4b6a313dc76912bd4ad3b8b4f4b479c801) |
|---|---|
| 1# SPDX-License-Identifier: GPL-2.0-only 2 3choice 4 prompt "Preemption Model" 5 default PREEMPT_NONE 6 7config PREEMPT_NONE 8 bool "No Forced Preemption (Server)" --- 21 unchanged lines hidden (view full) --- 30 This allows reaction to interactive events by allowing a 31 low priority process to voluntarily preempt itself even if it 32 is in kernel mode executing a system call. This allows 33 applications to run more 'smoothly' even when the system is 34 under load. 35 36 Select this if you are building a kernel for a desktop system. 37 | 1# SPDX-License-Identifier: GPL-2.0-only 2 3choice 4 prompt "Preemption Model" 5 default PREEMPT_NONE 6 7config PREEMPT_NONE 8 bool "No Forced Preemption (Server)" --- 21 unchanged lines hidden (view full) --- 30 This allows reaction to interactive events by allowing a 31 low priority process to voluntarily preempt itself even if it 32 is in kernel mode executing a system call. This allows 33 applications to run more 'smoothly' even when the system is 34 under load. 35 36 Select this if you are building a kernel for a desktop system. 37 |
| 38config PREEMPT | 38config PREEMPT_LL |
| 39 bool "Preemptible Kernel (Low-Latency Desktop)" 40 depends on !ARCH_NO_PREEMPT | 39 bool "Preemptible Kernel (Low-Latency Desktop)" 40 depends on !ARCH_NO_PREEMPT |
| 41 select PREEMPT_COUNT | 41 select PREEMPT |
| 42 select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK 43 help 44 This option reduces the latency of the kernel by making 45 all kernel code (that is not executing in a critical section) 46 preemptible. This allows reaction to interactive events by 47 permitting a low priority process to be preempted involuntarily 48 even if it is in kernel mode executing a system call and would 49 otherwise not be about to reach a natural preemption point. 50 This allows applications to run more 'smoothly' even when the 51 system is under load, at the cost of slightly lower throughput 52 and a slight runtime overhead to kernel code. 53 54 Select this if you are building a kernel for a desktop or 55 embedded system with latency requirements in the milliseconds 56 range. 57 | 42 select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK 43 help 44 This option reduces the latency of the kernel by making 45 all kernel code (that is not executing in a critical section) 46 preemptible. This allows reaction to interactive events by 47 permitting a low priority process to be preempted involuntarily 48 even if it is in kernel mode executing a system call and would 49 otherwise not be about to reach a natural preemption point. 50 This allows applications to run more 'smoothly' even when the 51 system is under load, at the cost of slightly lower throughput 52 and a slight runtime overhead to kernel code. 53 54 Select this if you are building a kernel for a desktop or 55 embedded system with latency requirements in the milliseconds 56 range. 57 |
| 58config PREEMPT_RT 59 bool "Fully Preemptible Kernel (Real-Time)" 60 depends on EXPERT && ARCH_SUPPORTS_RT 61 select PREEMPT 62 help 63 This option turns the kernel into a real-time kernel by replacing 64 various locking primitives (spinlocks, rwlocks, etc.) with 65 preemptible priority-inheritance aware variants, enforcing 66 interrupt threading and introducing mechanisms to break up long 67 non-preemptible sections. This makes the kernel, except for very 68 low level and critical code pathes (entry code, scheduler, low 69 level interrupt handling) fully preemptible and brings most 70 execution contexts under scheduler control. 71 72 Select this if you are building a kernel for systems which 73 require real-time guarantees. 74 |
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| 58endchoice 59 60config PREEMPT_COUNT 61 bool | 75endchoice 76 77config PREEMPT_COUNT 78 bool |
| 79 80config PREEMPT 81 bool 82 select PREEMPT_COUNT |
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