进程调度杂项汇总

1. sched class与sched policy的对应关系

完全公平调度：SCHED_NORMAL SCHED_BATCH
实时进程调度：SCHED_FIFO SCHED_RR
空闲调度：SCHED_IDLE
Deadline调度: SCHED_DEADLINE

//kernel/sched/sched.h
static inline int idle_policy(int policy)
{
    return policy == SCHED_IDLE;
}
static inline int fair_policy(int policy)
{
    return policy == SCHED_NORMAL || policy == SCHED_BATCH;
}

static inline int rt_policy(int policy)
{
    return policy == SCHED_FIFO || policy == SCHED_RR;
}

static inline int dl_policy(int policy)
{
    return policy == SCHED_DEADLINE;
}