static void __sched notrace __schedule(unsigned int sched_mode) { struct task_struct *prev, *next; unsigned long *switch_count; unsigned long prev_state; struct rq_flags rf; struct rq *rq; int cpu; cpu = smp_processor_id(); rq = cpu_rq(cpu); prev = rq->curr; schedule_debug(p...
void (*migrate_task_rq)(struct task_struct *p, int next_cpu); void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); void (*post_schedule) (struct rq *this_rq); void (*task_waking) (struct task_struct *task); void (*task_woken) (struct rq *this_rq, struct ta...
trace_sched_waking(p);smp_rmb();if(READ_ONCE(p->on_rq) &&ttwu_runnable(p, wake_flags))gotounlock; // 待唤醒的进程在某一个CPU的运行队列 #ifdef CONFIG_SMPsmp_acquire__after_ctrl_dep();WRITE_ONCE(p->__state, TASK_WAKING);if(smp_load_acquire(&p->on_cpu) &&ttwu_queue_wakelist(...
pick_next_task:从调度类中选出下一个要运行的进程 put_prev_task:将进程放回到调度类中 select_task_rq:为进程选择一个合适的cpu的运行队列 migrate_task_rq:迁移到另外的cpu运行队列 pre_schedule:调度以前调用 post_schedule:通知调度器完成切换 task_waking、task_woken:用于进程唤醒 set_cpus_allowed:修改进...
一、Linux中的Task与内核态 1.1Task 的定义与作用 在Linux 操作系统中,任务(Task)是内核管理进程和线程的统一结构。它可以是一个进程,也可以是一个线程。一个任务可以包含多个线程,而一个进程可以包含多个任务。通常,一个任务由一个进程来管理。Task 负责维护进程相关信息,如进程状态、标识符、内核栈、标记以及表示...
#defineTASK_RUNNING 0#defineTASK_INTERRUPTIBLE 1#defineTASK_UNINTERRUPTIBLE 2#define__TASK_STOPPED 4#define__TASK_TRACED 8/*in tsk->exit_state*/#defineEXIT_ZOMBIE 16#defineEXIT_DEAD 32/*in tsk->state again*/#defineTASK_DEAD 64#defineTASK_WAKEKILL 128#defineTASK_WAKING 256#defineTASK_STATE_...
* X->state = WAKING * set_task_cpu(X,2) * * LOCK rq(2)->lock * enqueue X * X->state = RUNNING * UNLOCK rq(2)->lock * * LOCK rq(2)->lock // orders against CPU1 * sched-out Z * sched-in X * UNLOCK rq(2)->lock ...
1#defineTASK_UNINTERRUPTIBLE 2#define__TASK_STOPPED 4#define__TASK_TRACED 8/* in tsk->exit_state */#defineEXIT_ZOMBIE 16#defineEXIT_DEAD 32/* in tsk->state again */#defineTASK_DEAD 64#defineTASK_WAKEKILL 128#defineTASK_WAKING 256#defineTASK_STATE_MAX 512#defineTASK_STATE_TO_CHAR_STR ...
首先,我们需要清楚,什么样的进程会进入调度器进行选择,就是处于TASK_RUNNING状态的进程,而其他状态下的进程都不会进入调度器进行调度。系统发生调度的时机如下 调用cond_resched()时 显式调用schedule()时 从系统调用或者异常中断返回用户空间时 从中断上下文返回用户空间时 ...
.select_task_rq = select_task_rq_fair, #ifdef CONFIG_FAIR_GROUP_SCHED .migrate_task_rq = migrate_task_rq_fair, #endif .rq_online = rq_online_fair, .rq_offline = rq_offline_fair, .task_waking = task_waking_fair, #endif .set_curr_task = set_curr_task_fair, ...