Re: Hibernation considerations

david
2007-07-16T06:56:22Z

On Mon, 16 Jul 2007, Al Boldi wrote:

>
> david@lang.hm wrote:
>> suspend-to-RAM should not involve kexec, the only reason for doing the
>> kexec to to get a seperate userspace to use for suspend-to-disk operations
>> instead of trying to partially freeze the sustem and keep useing it.
>
> Or you could do suspend-to-disk-and-RAM. But in the above case, it was meant
> to test kexec compatibility with device suspend/resume calls.

the point I am trying to make here is that there is no reason that the
kexec approach needs to do _any_ suspend/resume calls.

all that is needed is the ability of the new kernel to initialize the
devices it needs.

suspend-to-disk-and-ram could be implemented as three
seperate steps

1. suspend-to-disk

2. resume-from-disk

3. suspend-to-ram

followed by either

4. resume-from-ram

or

4. battery dies and loptop powers off completely

5. power-on boot.

6. resume-from-disk

all that you need to do is to make sure that the system doesn't run
anything that would affect permanent media or the outside world between
steps #2 and #3

yes it's more steps, but each step is logicly seperate, and each step will
be excercised on a regular basis, so the combination of the steps will
also be reliable.

this is far better then creating yet another way to pause the system that
only a few people will use.

David Lang