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 slighly 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 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
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
53 endchoice
54
55 config 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
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.