[linux-pm] [PATCH -mm 1/2] kexec jump -v12: kexec jump
stern at rowland.harvard.edu
Sat Jul 12 15:55:02 EDT 2008
On Fri, 11 Jul 2008, Eric W. Biederman wrote:
> > Forcing the second set of requests to filter through an extra software
> > layer is a clumsy way of accomplishing this. There ought to be a
> > better approach.
> The point was something different. The reasons we can not store the
> state of the system with the hardware devices logically hot unplugged
> (and thus reuse all of the find device hotplug methods) is because
> things like the filesystem layer don't know how to cope with their
> block devices going away an coming back.
This is not how the procedure works. During hibernation, block devices
are not logically hot-unplugged. (If they were then they couldn't be
used for writing the memory image.) Instead, they are quiesced or
suspended and their input queues are plugged.
> That is the problem inserting an virtual software device in the middle
> can solve. If that works should there be a better way? Certainly but
> to prove it out starting with a block device wrapper is a trivial way to
This sounds like a solution to a non-existent problem.
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