cfq scheduler 参数设置
============= CFS scheduler ============= 1. OVERVIEW CFS stands for "Completely Fair scheduler," and is the new "desktop" process scheduler implemented by Ingo Molnar and merged in Linux 2.6.23. It is the replacement for the previous vanilla scheduler's SCHED_OTHER interactivity code. 80% of CFS's design can be summed up in a single sentence: CFS basically models an "ideal, precise multi-tas...
我有manage scheduler权利,但不是DBA. 请问怎样才能查看当前作业状态?是不是要DBA GRANT ACCESS to dba_scheduler_job_log?谢谢!
The analysis of cfq for Linux 2.6.28.5 How to add request: Instruction: (1)(2)(5): Every process in cfq has a correspond queue whose name is cfqq. Actually, each cfqq has two queues, like DEADLINE, one queue is sorted by LBA of requests, the other queue is sorted by arrival time. The queue sorted by LBA is actually a red-black tree while the queue sorted by arrival time is calle...
cfq(Complete Fairness Queueing) IO scheduler ================================================ cfq被设计成用于多线程能公平的使用磁盘带宽的一种IO调度算法。 cfq为每个进程/线程，单独创建了一个队列来管理该进程所产生的请求。 严格的是说，依据IO上下文创建的队列。而队列之间的调度使用了时间片来调度， 这样就可以保证每个进程都能被很好的分配到IO带宽。从而实现了进程间的公平。 该算法现在作为默认的调度算法。 Sele...
本帖最后由 embeddedlwp 于 2011-12-07 11:10 编辑 Linux 2.6.11 在scheduler_tick函数中，如果是普通进程，并且时间片没有用完会执行下边的代码：[code]2487 if (TASK_INTERACTIVE(p) && !((task_timeslice(p) - 2488 p->time_slice) % TIMESLICE_GRANULARITY(p)) && 2489 (p->time_slice >= TIMESLICE_GRANULARITY(p)) && 2490 (p->ar...
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Inside the Linux scheduler The latest version of this all-important kernel component improves scalability Level: Intermediate M. Tim Jones ( [email=mtj@mtjones.com?subject=Inside the Linux scheduler&cc=tomyoung@us.ibm.com]mtj@mtjones.com[/email] ), Consultant Engineer, Emulex 30 Jun 2006 The Linux® kernel continues to evolve, incorporating new technologies and gaining in reliability, scalab...
Solving starvation problems in the scheduler [Posted March 22, 2006 by corbet] The Linux CPU scheduler has come a long way since the early 2.6 days, when it was the cause for quite a bit of worry. Scheduling domains fixed many of the problems on larger systems, while a whole set of interactivity heuristics made desktops work better. The interactivity work, in particular, is based on the notion ...
Solving starvation problems in the scheduler [Posted March 22, 2006 by corbet] The Linux CPU scheduler has come a long way since the early 2.6 days, when it was the cause for quite a bit of worry. Scheduling domains fixed many of the problems on larger systems, while a whole set of interactivity heuristics made desktops work better. The interactivity work, in particular, is based on the notion ...
As mentioned above delta_time = now - prev_stored_now se.wait_runtime = delta_time - delta_exec_time According to these definitions, CFS scheduler can work smoothly. But there are some other factors to affect the fairness. We should take these factors into account. Then CFS scheduler 1. tunes se.fair_key: se.fair_key = cfs_rq.fair_clock - se.wait_runtime, if se.load_weigh...
