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    Subject[PATCH 0/10] Make bsd process accounting work in pid namespaces
    After I fixed access to task->tgid in kernel/acct.c, Oleg 
    pointed out some bad side effects with this accounting vs pid
    namespaces interaction. I.e. when some task in pid namespace
    sets this accounting up, this blocks all the others from doing
    the same. Restricting this to init namespace only could help,
    but didn't look as a grace solution.

    So here is the approach to make this accounting work with pid
    namespaces properly.

    The idea is simple - when a task dies it accounts itself in
    each namespace it is visible from and which set the accounting
    up.

    For example here are the commands run and the output of lastcomm
    from init and sub namespaces:

    init_ns# accton pacct
    sub_ns# accton pacct (this is a different file - sub ns is run in
    a chroot-ed environment)
    init_ns# cat /dev/null
    sub_ns# ls /dev/null
    init_ns# accton
    sub_ns# accton

    sub_ns# lastcomm -f pacct
    ls 0 [136,0] 0.00 secs Thu May 15 10:30
    accton 0 [136,0] 0.00 secs Thu May 15 10:30

    init_ns# lastcomm -f pacct
    accton root pts/0 0.00 secs Thu May 15 14:30 << got from sub
    cat root pts/1 0.00 secs Thu May 15 14:30
    ls root pts/0 0.00 secs Thu May 15 14:30 << got from sub
    accton root pts/1 0.00 secs Thu May 15 14:30

    That was the summary, the details are in patches.

    The set was sent for RFC a month ago, but I got only one, but
    positive response from Oleg. Hopefully, he can confirm one now.

    Signed-off-by: Pavel Emelyanov <xemul@openvz.org>


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