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    SubjectRe: Which process is associated with process ID 0 (swapper)
    >> 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
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