Messages in this thread | | | Date | Fri, 21 Apr 2006 00:10:34 +0200 (MEST) | From | Jan Engelhardt <> | Subject | Re: Which process is associated with process ID 0 (swapper) |
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>> This must be a trick question. Linux is not VAX/VMS. There is no >> swapper process. Check in /proc. Processes start at 1. Even >> kernel threads have PIDs greater than 1. > >Linux really has swapper process ;) > To be precise, it has more than one.
When you hit an OOPS, the trace [1] might show: "Pid: 0, comm: swapper Not tainted 2.6.11.6"
Plus you see one of these per CPU [ps aufwwx]: root 106 0.0 0.0 0 0 ? S Apr20 0:04 [kswapd0]
So, a question to the public: what swapper swaps, and what's swapper(as in pid 0) in oops, if there's no PID 0?
>I'm writing kernel module that hooks into netfilter code. I can catch >packet's information and its owner process. The first SYN packet of >handshaking belongs to real user-space socket/process. After timeout, >several SYN packets are generated by kernel-space swapper process (PID >0) Is there anyway to find out the relationship between them in >_kernel_space_ (module context). > Is your code doing it like ipt_owner does?
[1] http://www.ussg.iu.edu/hypermail/linux/kernel/0504.0/0416.html
Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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