linux进程的状态

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在使用ps命令的时候有一列为进程的状态，例如

[davidp@supernova:~]$ ps u

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

davidp 3995 0.0 0.4 3324 1956 pts/2 Ss Aug17 0:00 /bin/bash

davidp 25049 0.0 0.8 7104 3908 pts/5 S+ Aug19 0:10 irssi

davidp 26180 0.0 0.1 2656 908 pts/0 R+ 14:41 0:00 ps u

其中STAT列为进程的状态

The codes used are:

Code	Meaning
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:

Code	Meaning
<	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