Resuming from a crashdump

[takawata at jp.freebsd.org]

In message <86pszu639o.fsf at borg.borderworlds.dk>, Christian Laursen wrote:
>I was thinking about software suspend and got this crazy idea.

Not so crazy Idea.

>I have no idea if this is possible or total madness but here
>goes anyway.
>
>The idea would be to force the system to "crash" and make a
>dump on a dedicated partition. On boot after initializing devices
>but before mounting /, the kernel would check that partition and
>if it found a dump there restore it to the machine's memory,
>reinitialize devices and continue where it left off.
>
>Any thoughts? Could this be done or would an entirely different
>approach be better?

OS-initiated ACPI S4 sleep may be implemented in the way like this.