*/voidscheduler_tick(void){intcpu =smp_processor_id();structrq*rq =cpu_rq(cpu);structtask_struct*curr = rq->curr;structrq_flagsrf;sched_clock_tick();rq_lock(rq, &rf);walt_set_window_start(rq, &rf);walt_update_task_ravg(rq->curr, rq, TASK_UPDATE,walt_ktime_clock(),0);update...
void scheduler_tick(void) { int cpu = smp_processor_id(); struct rq *rq = cpu_rq(cpu); struct task_struct *curr = rq->curr; struct rq_flags rf; sched_clock_tick(); rq_lock(rq, &rf); update_rq_clock(rq); curr->sched_class->task_tick(rq, curr, 0); /* 1 */ cpu_load...
struct sched_domain *tmp, *affine_sd = NULL, *sd = NULL; int cpu = smp_processor_id(); int new_cpu = cpu; int want_affine = 0; int sync = wake_flags & WF_SYNC; /* 当A进程唤醒B进程时,从try_to_wake_up()进入本函数,这里会置位SD_BALANCE_WAKE。 */ if (sd_flag & SD_BALA...
struct sched_domain *tmp, *affine_sd = NULL, *sd = NULL; int cpu = smp_processor_id(); int new_cpu = cpu; int want_affine = 0; int sync = wake_flags & WF_SYNC; /* 当A进程唤醒B进程时,从try_to_wake_up()进入本函数,这里会置位SD_BALANCE_WAKE。 */ if (sd_flag & SD_BALA...
(2)对称多处理器(Symmetric Multi-Processor,SMP):即一致内存访问(Uniform Memory Access,UMA),所有处理器访问内存花费的时间是相同的。每个处理器的地位是平等的,仅在内核初始化的时候不平等:“0号处理器作为引导处理器负责初始化内核,其他处理器等待内核初始化完成。”...
/** This function gets called by the timer code, with HZ frequency.* We call it with interrupts disabled.*/void scheduler_tick(void){int cpu = smp_processor_id();struct rq *rq = cpu_rq(cpu);struct task_struct *curr = rq->curr;struct rq_flags rf;sched_clock_tick();rq_lock(rq,...
(2)对称多处理器(Symmetric Multi-Processor,SMP):即一致内存访问(Uniform Memory Access,UMA),所有处理器访问内存花费的时间是相同的。每个处理器的地位是平等的,仅在内核初始化的时候不平等:“0号处理器作为引导处理器负责初始化内核,其他处理器等待内核初始化完成。”...
int cpu = smp_processor_id(); struct rq *rq = cpu_rq(cpu); struct task_struct *curr = rq->curr; struct rq_flags rf; sched_clock_tick(); rq_lock(rq, &rf); walt_set_window_start(rq, &rf); walt_update_task_ravg(rq->curr, rq, TASK_UPDATE, ...
Linux内核获取当前CPU id CPU id是percpu变量,调用smp_processor_id()可以取出。内核里对它的注释如下: smp_processor_id() is safe if it's used in a preemption-off critical section, or in a thread that is bound to the current CPU....
soft lockup detector机制通过smp_hotplug_thread机制为每个CPU核创建一个内核线程[watchdog/X] (其中N为CPU ID,该内核线程为FIFI 99最高优先级,此类线程设置了 p->flags |= PF_NO_SETAFFINITY属性,不允许用户空间设置CPU亲和性)。该线程定时(每隔4s执行一次)对变量watchdog_touch_ts加加操作,即喂狗。