小编Joe*_*eys的帖子

从内核源代码来看：

static void __sched notrace __schedule(bool preempt)
{
        struct task_struct *prev, *next;
        unsigned long *switch_count;
        struct rq_flags rf;
        struct rq *rq;
        int cpu;

        cpu = smp_processor_id();
        rq = cpu_rq(cpu);
        prev = rq->curr;  // <=================(1)
        .....

上面第 (1) 行中的current和之间有什么区别？prev

在该行之后添加printk()：

static void __sched notrace __schedule(bool preempt)
{
        struct task_struct *prev, *next;
        unsigned long *switch_count;
        struct rq_flags rf;
        struct rq *rq;
        int cpu;

        cpu = smp_processor_id();
        rq = cpu_rq(cpu);
        prev = rq->curr;
        //if(prev->pid != current->pid)
        printk("the prev->pid …