sched_getscheduler(pid) 中的每个 return int 值对应什么调度策略? [C]
What scheduling policy does each return int value from sched_getscheduler(pid) correspond to? [C]
当我使用以下代码将调度策略设置为 Deadline 时:
struct sched_attr attr = {
.size = sizeof(attr),
.sched_policy = SCHED_DEADLINE,
.sched_runtime = 30000000,
.sched_period = 100000000,
.sched_deadline = 100000000
};
pid_t pid = getpid();
printf("pid=(%d)\n",pid);
if (sched_setattr(pid, &attr, 0)){
printf("[ERROR] sched_setattr()\n");
perror("[ERROR] sched_setattr()\n");
}
// Check scheduler policy is set correctly
printf("Scheduler Policy is %d.\n", sched_getscheduler(pid));
上述代码运行结果如下:
pid=(XXXXXX)
Scheduler Policy is 6.
有人可以解释 sched_getscheduler(pid) 中的哪个 return int 值对应于哪个调度程序策略吗?
例如:根据上述代码,我认为 6 对应于 SCHED_DEADLINE 政策。
您可以自己在自己的系统上轻松找到类似的东西,例如:
$ grep -r SCHED_DEADLINE /usr/include/
/usr/include/linux/sched.h:
#define SCHED_DEADLINE 6
$ grep define.SCHED_ /usr/include/linux/sched.h
#define SCHED_NORMAL 0
#define SCHED_FIFO 1
#define SCHED_RR 2
#define SCHED_BATCH 3
#define SCHED_IDLE 5
#define SCHED_DEADLINE 6
当我使用以下代码将调度策略设置为 Deadline 时:
struct sched_attr attr = {
.size = sizeof(attr),
.sched_policy = SCHED_DEADLINE,
.sched_runtime = 30000000,
.sched_period = 100000000,
.sched_deadline = 100000000
};
pid_t pid = getpid();
printf("pid=(%d)\n",pid);
if (sched_setattr(pid, &attr, 0)){
printf("[ERROR] sched_setattr()\n");
perror("[ERROR] sched_setattr()\n");
}
// Check scheduler policy is set correctly
printf("Scheduler Policy is %d.\n", sched_getscheduler(pid));
上述代码运行结果如下:
pid=(XXXXXX)
Scheduler Policy is 6.
有人可以解释 sched_getscheduler(pid) 中的哪个 return int 值对应于哪个调度程序策略吗?
例如:根据上述代码,我认为 6 对应于 SCHED_DEADLINE 政策。
您可以自己在自己的系统上轻松找到类似的东西,例如:
$ grep -r SCHED_DEADLINE /usr/include/
/usr/include/linux/sched.h:
#define SCHED_DEADLINE 6
$ grep define.SCHED_ /usr/include/linux/sched.h
#define SCHED_NORMAL 0
#define SCHED_FIFO 1
#define SCHED_RR 2
#define SCHED_BATCH 3
#define SCHED_IDLE 5
#define SCHED_DEADLINE 6