朗文词典:pre-empt or preempt:1. make what sb has planned to do or say unnecessary or ineffective by saying or doing sth first2. replace a television show with a special program or report Merriam-Webster里有更长的对preempt和preemption的解释。 In computing, pre
The reason that preemption is disabled on a uniprocessor system is: If not: P1 holds the lock and after a time is scheduled out. Now P2 starts executing and let’s say requests the same spinlock. Since P1 has not released the spinlock, P2 must spin and
我刚看了一篇文章说： Reasons to control the interrupt system generally boil down to needing to provide synchronization. By disabling interrupts, you can guarantee that an interrupt handler will not preempt your current code. Moreover, disabling interrupts also
我正在阅读“理解Linux内核,第3版”,在第5章“内核抢占”一节中,它说： All process switches are performed by the switch_to macro. In both preemptive and nonpreemptive kernels, a process switch occurs when a process has finished some thread of kernel activity a
在sched_fair.c中它有： unsigned int sysctl_sched_latency = 5000000ULL //5m unsigned int sysctl_sched_min_granularity = 1000000ULL //1ms 我知道Linux公平时间片根据nr_running和这个公平任务的相对权重而有所不同,但通过代码学习,我发现主要思想是将时间片保持1到5毫秒.
我正在阅读一篇关于linux内核基数树实现的文章,文章链接如下： http://lwn.net/Articles/175432/ 在本文中,它提到radix_tree_preload分配了足够的内存,以便后续插入树中不会失败.虽然它基于每个CPU分配结构,因此函数返回时禁用抢占.调用者的责任是调用radix_tree_preload_end以启用
