linux进程的状态
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 |
~~DISCUSSION~~
