Linux 进程状态 Ss、Sl、S+、Z、I< 等是什么意思？

man ps

...
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

       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

               D (TASK_UNINTERRUPTIBLE) 	不可中断的睡眠状态
               R (TASK_RUNNING)				正在运行，或在队列中的进程
               S (TASK_INTERRUPTIBLE)		可中断的睡眠状态
               T (TASK_STOPPED)				停止状态
               t (TASK_TRACED)				被跟踪状态
               Z (TASK_DEAD - EXIT_ZOMBIE)  退出状态，但没被父进程收尸，成为僵尸状态
               W    						进入内存交换（从内核2.6开始无效）
               X (TASK_DEAD - EXIT_DEAD)    退出状态，进程即将被销毁,非常短暂的状态


               <    高优先级
               N    低优先级
               L    有些页被锁进内存
               s    包含子进程
               +    位于后台的进程组
               l    多线程，克隆线程