linux - 如何查看 `ps` 输出以外的进程调度策略

Question

我正在使用 busybox 版本的 linux 并想检查进程调度策略。 PS 输出仅显示 PID USER VSZ STAT COMMAND，而不考虑 PS 命令给出的任何选项。有没有其他方法可以查看进程调度策略？

提前致谢!

Answer 1

您可以通过查看/proc/pocess_id/sched 找到进程的调度信息。

例如:

awk '/policy/ {print $NF}' /proc/25/sched

将为您提供进程 25 的策略编号。

更多的保单号可以看man sched_setscheduler:

Scheduling Policies:
    ...
   For  threads scheduled under one of the normal scheduling policies
   (SCHED_OTHER, SCHED_IDLE, SCHED_BATCH), sched_priority is not used
   in scheduling decisions (it must be specified as 0).

   Processes scheduled under one of the real-time policies
   (SCHED_FIFO, SCHED_RR) have a sched_priority value in the range 1
   (low)  to  99  (high).  (As the numbers imply, real-time threads
   always have higher priority than normal threads.)  Note well:
   POSIX.1-2001 requires an implementation to support only a minimum
   32 distinct priority levels for the real-time policies, and some
   systems supply  just  this  minimum.   Portable  programs should
   use sched_get_priority_min(2) and sched_get_priority_max(2) to
   find the range of priorities supported for a particular policy.