Wednesday, January 13, 2016

linux: process state codes

The codes used are:
DUninterruptible sleep (usually IO)
RRunning or runnable (on run queue)
SInterruptible sleep (waiting for an event to complete)
TStopped, either by a job control signal or because it is being traced.
Wpaging (not valid since the 2.6.xx kernel)
Xdead (should never be seen)
ZDefunct (“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)
Nlow-priority (nice to other users)
Lhas pages locked into memory (for real-time and custom IO)
sis a session leader
lis multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+is in the foreground process group

D state occurs then the process is in uninterruptible sleep. This state is bad, because you can't do anything with the process in D state. 

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