问题描述
在ps的STAT列中，有一大堆字母没有太多意义。他们的意思是什么？
这是ps aux | head的一个例子：
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 27176 2960 ? Ss Sep20 0:02 /sbin/init
root 2 0.0 0.0 0 0 ? S Sep20 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Sep20 13:05 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S< Sep20 0:00 [kworker/0:0H]
root 7 0.0 0.0 0 0 ? S< Sep20 0:00 [kworker/u:0H]
root 8 0.0 0.0 0 0 ? S Sep20 2:16 [migration/0]
root 9 0.0 0.0 0 0 ? S Sep20 0:00 [rcu_bh]
root 10 0.0 0.0 0 0 ? S Sep20 20:08 [rcu_sched]
root 11 0.0 0.0 0 0 ? S Sep20 0:07 [watchdog/0]
root 12 0.0 0.0 0 0 ? S Sep20 0:05 [watchdog/1]
root 13 0.0 0.0 0 0 ? S Sep20 2:21 [ksoftirqd/1]
root 14 0.0 0.0 0 0 ? S Sep20 1:00 [migration/1]
最佳解决办法
man ps在“PROCESS STATE CODES”标题下有所有答案：
PROCESS STATE CODES
Here are the different values that the s, stat and state output specifiers (header "STAT" or "S") will display to describe the state of a process:
D uninterruptible sleep (usually IO)
R running or runnable (on run queue)
S interruptible sleep (waiting for an event to complete)
T stopped, either by a job control signal or because it is being traced.
W paging (not valid since the 2.6.xx kernel)
X dead (should never be seen)
Z defunct ("zombie") process, terminated but not reaped by its parent.
For BSD formats and when the stat keyword is used, additional characters may be displayed:
< high-priority (not nice to other users)
N low-priority (nice to other users)
L has pages locked into memory (for real-time and custom IO)
s is a session leader
l is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+ is in the foreground process group.