解釋一個詞語：preemption

Merriam-Webster的解爲：

preemption

n

1 the right of purchasing befor others; especially: one given by the government to the actual settler upon a tract of public land

2 the purchase of something under this right

3 a prior seizure or appropriation: a taking posssession before others

 

 

CONFIG_PREEMPT - This option reduces the latency of the kernel when reacting to 
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.

Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.

CONFIG_PREEMPT_BKL - This option reduces the latency of the kernel by making the 
big kernel lock （BKL）preemptible.

Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.