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    SubjectRe: unusual scheduling performance
    As Andrew suggested, I put a dump_stack() in rwsem_down_write_failed().

    This was actually in a 2.5.47 bk snapshot, so it has eventpoll in it.
    kksymoops is broken, so:
    dmesg | tail -20 | sort | uniq | ksymoops -m /boot/System.map

    Trace; c01c5757 <rwsem_down_write_failed+27/170>
    Trace; c01220c6 <update_wall_time+16/50>
    Trace; c01223ee <do_timer+2e/c0>
    Trace; c0166bd3 <.text.lock.eventpoll+6/f3>
    Trace; c0146568 <__fput+18/c0>
    Trace; c010ae9a <handle_IRQ_event+2a/60>
    Trace; c0144a05 <filp_close+85/b0>
    Trace; c0144a8d <sys_close+5d/70>
    Trace; c0108fab <syscall_call+7/b>

    Trace; c01c5757 <rwsem_down_write_failed+27/170>
    Trace; c0166bd3 <.text.lock.eventpoll+6/f3>
    Trace; c0146568 <__fput+18/c0>
    Trace; c011e90b <do_softirq+6b/d0>
    Trace; c0144a05 <filp_close+85/b0>
    Trace; c0144a8d <sys_close+5d/70>
    Trace; c0108fab <syscall_call+7/b>

    Trace; c01c5757 <rwsem_down_write_failed+27/170>
    Trace; c0166bd3 <.text.lock.eventpoll+6/f3>
    Trace; c0146568 <__fput+18/c0>
    Trace; c0144c2d <generic_file_llseek+2d/e0>
    Trace; c0144a05 <filp_close+85/b0>
    Trace; c0144a8d <sys_close+5d/70>
    Trace; c0108fab <syscall_call+7/b>

    Trace; c01c5757 <rwsem_down_write_failed+27/170>
    Trace; c0166bd3 <.text.lock.eventpoll+6/f3>
    Trace; c0146568 <__fput+18/c0>
    Trace; c01553fa <sys_getdents64+4a/98>
    Trace; c0144a05 <filp_close+85/b0>
    Trace; c0144a8d <sys_close+5d/70>
    Trace; c0108fab <syscall_call+7/b>

    Mystery solved?

    --
    Dave Hansen
    haveblue@us.ibm.com

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