Info about suspend-to-disk

[Eric McCorkle]

Hi everyone,

I'm gathering information in preparation for possibly working on
suspend-to-disk functionality.  I have a fairly good idea of what it
would take and one way to attack it.  The overall plan would look
something like this:

* Use dump functionality to write an entire OS image out to disk.  As
this is a voluntary dump, it should be possible to go through the FS
interface to produce a regular file.

* Modify boot1 to check for saved images.  Load and resume if one exists.

* Presumably there would need to be some new device methods added to do
saving/reinitialization of devices.


The major open questions for me are the following:

* Is there/has there been significant work in this direction?

* Is there perhaps a better strategy?

* Do the codepaths currently exist to allow dump functionality to write
to a regular file in the case of a voluntary dump, or would this need to
be added?

* What would be the most sensible default behavior for device
hibernate/unhibernate methods?

* Any other significant issues

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