笔记：top 状态识别

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)

          I    Idle kernel thread

          R    running or runnable (on run queue)

          S    interruptible sleep (waiting for an event to complete)

          T    stopped by job control signal

          t    stopped by debugger during the tracing

          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

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)#遇到的这里是多进程，Sl 其实是有任务在运行的；ps -ef 可以找到，top可以看到相应进程在运行

          +    is in the foreground process group