top LINUX进程几种状态：
Z（zombie）：僵尸进程
T（terminal）：暂停状态
R：运行
D: 不间断睡眠（IO）
ps -uax进程状态符号意义（man ps中PROCESS STATE CODES章节copy过来）：
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
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
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