BFS has one single lock protecting the process local data of every task in the global queue. Thus every insertion, removal and modification of task data in the global runqueue needs to grab the global lock. However, once a task is taken by a CPU, the CPU has its own local data copy ...
//file:kernel/time/timer.cvoidupdate_process_times(intuser_tick){structtask_struct*p=current;//...
BFS has one single lock protecting the process local data of every task in the global queue. Thus every insertion, removal and modification of task data in the global runqueue needs to grab the global lock. However, once a task is taken by a CPU, the CPU has its own local data copy ...
BFS has one single lock protecting the process local data of every task in the global queue. Thus every insertion, removal and modification of task data in the global runqueue needs to grab the global lock. However, once a task is taken by a CPU, the CPU has its own local data copy ...
will be described after the virtual deadline mechanism is explained. 在schedule核心函数中,使用return_task来把prev进程重新入队,在earliest_deadline_task这个pick-next中,使用take_task将选中的next从队列取出,从而实现队列外执行。 5.10 结论 从上面的论述,我们丝毫没有看到有任何的诸如“SMP负载均衡”,“CPU...
Lookup will be described after the virtual deadline mechanism is explained. 在schedule核心函数中,使用return_task来把prev进程重新入队,在earliest_deadline_task这个pick-next中,使用take_task将选中的next从队列取出,从而实现队列外执行。 5.10 结论 从上面的论述,我们丝毫没有看到有任何的诸如“SMP负载均衡”,...
work_func_tcurrent_func;/* L: current_work's fn */ structpool_workqueue*current_pwq;/* L: current_work's pwq */ booldesc_valid;/* ->desc is valid */ structlist_headscheduled;/* L: scheduled works */ /* 64 bytes boundary on 64bit, 32 on 32bit */ structtask_struct...
<P>在输出信息中,irqs-off、need_resched 等字段对应于进程结构 struct task_struct 的字段或者状态标志,可以从头文件 arch/<platform>/include/asm/thread_info.h 中查看进程支持的状态标志,include/linux/sched.h 则给出了结构 struct task_struct 的定义。其中,irqs-off 字段显示是否中断被禁止,为‘ d ’表...
time. When a CPU is made to reschedule, the lookup for the next task to get CPU time is performed in the following way: First the bitmap is checked to see what static priority tasks are queued. If any realtime priorities are found, the corresponding queue is checked and the ...
在输出信息中,irqs-off、need_resched 等字段对应于进程结构 struct task_struct 的字段或者状态标志,可以从头文件 arch/<platform>/include/asm/thread_info.h 中查看进程支持的状态标志,include/linux/sched.h 则给出了结构 struct task_struct 的定义。其中,irqs-off 字段显示是否中断被禁止,为‘ d ’表示中断...