| Kconfig.preempt (c1b054d03f5b31c33eaa0b267c629b118eaf3790) | Kconfig.preempt (3dde6ad8fc3939d345a3768464ecff43c91d511a) |
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| 1 2choice 3 prompt "Preemption Model" 4 default PREEMPT_NONE 5 6config PREEMPT_NONE 7 bool "No Forced Preemption (Server)" 8 help --- 9 unchanged lines hidden (view full) --- 18 19config 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, | 1 2choice 3 prompt "Preemption Model" 4 default PREEMPT_NONE 5 6config PREEMPT_NONE 7 bool "No Forced Preemption (Server)" 8 help --- 9 unchanged lines hidden (view full) --- 18 19config 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 slighly lower throughput. | 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 36config PREEMPT 37 bool "Preemptible Kernel (Low-Latency Desktop)" 38 help 39 This option reduces the latency of the kernel by making 40 all kernel code (that is not executing in a critical section) 41 preemptible. This allows reaction to interactive events by 42 permitting a low priority process to be preempted involuntarily 43 even if it is in kernel mode executing a system call and would 44 otherwise not be about to reach a natural preemption point. 45 This allows applications to run more 'smoothly' even when the | 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 36config PREEMPT 37 bool "Preemptible Kernel (Low-Latency Desktop)" 38 help 39 This option reduces the latency of the kernel by making 40 all kernel code (that is not executing in a critical section) 41 preemptible. This allows reaction to interactive events by 42 permitting a low priority process to be preempted involuntarily 43 even if it is in kernel mode executing a system call and would 44 otherwise not be about to reach a natural preemption point. 45 This allows applications to run more 'smoothly' even when the |
| 46 system is under load, at the cost of slighly lower throughput | 46 system is under load, at the cost of slightly lower throughput |
| 47 and a slight runtime overhead to kernel code. 48 49 Select this if you are building a kernel for a desktop or 50 embedded system with latency requirements in the milliseconds 51 range. 52 53endchoice 54 55config PREEMPT_BKL 56 bool "Preempt The Big Kernel Lock" 57 depends on SMP || PREEMPT 58 default y 59 help 60 This option reduces the latency of the kernel by making the 61 big kernel lock preemptible. 62 63 Say Y here if you are building a kernel for a desktop system. 64 Say N if you are unsure. 65 | 47 and a slight runtime overhead to kernel code. 48 49 Select this if you are building a kernel for a desktop or 50 embedded system with latency requirements in the milliseconds 51 range. 52 53endchoice 54 55config PREEMPT_BKL 56 bool "Preempt The Big Kernel Lock" 57 depends on SMP || PREEMPT 58 default y 59 help 60 This option reduces the latency of the kernel by making the 61 big kernel lock preemptible. 62 63 Say Y here if you are building a kernel for a desktop system. 64 Say N if you are unsure. 65 |