Shutdown/halt operation ordering

From: Peter Jeremy (peter.jeremy_at_alcatel.com.au)
Date: 02/26/04

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    Date: Thu, 26 Feb 2004 14:00:16 +1100
To: freebsd-stable@freebsd.org

    The low-level shutdown handling (in kern/kern_shutdown.c:boot()) does
    things in the following order:
    - shutdown_pre_sync events
    - sync disks (unless RB_NOSYNC)
    - shutdown_post_sync events
    - crashdump (if RB_DUMP)
    - shutdown_final events (which includes the final halt/reboot/...)

    shutdown_post_sync includes invoking the shutdown handler on all
    devices. Can someone please explain why this is invoked before
    dumpsys(), rather than after it? It would seem reasonable to want
    to do things like flush disk caches after the crashdump, rather than
    before. Also, this shutdown processing may disturb state information
    that is relevant to the problem that made the system panic.

    What is the impact of moving
            EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
    to after the dumpsys() call? 

    -- 
Peter Jeremy
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