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SubjectRe: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart
On Tue, 10 Feb 2009 09:05:47 -0800
Dave Hansen <dave@linux.vnet.ibm.com> wrote:

> On Tue, 2009-01-27 at 12:07 -0500, Oren Laadan wrote:
> > Checkpoint-restart (c/r): a couple of fixes in preparation for 64bit
> > architectures, and a couple of fixes for bugss (comments from Serge
> > Hallyn, Sudakvev Bhattiprolu and Nathan Lynch). Updated and tested
> > against v2.6.28.
> >
> > Aiming for -mm.
>
> Is there anything that we're waiting on before these can go into -mm? I
> think the discussion on the first few patches has died down to almost
> nothing. They're pretty reviewed-out. Do they need a run in -mm? I
> don't think linux-next is quite appropriate since they're not _quite_
> aimed at mainline yet.
>

I raised an issue a few months ago and got inconclusively waffled at.
Let us revisit.

I am concerned that this implementation is a bit of a toy, and that we
don't know what a sufficiently complete implementation will look like.
There is a risk that if we merge the toy we either:

a) end up having to merge unacceptably-expensive-to-maintain code to
make it a non-toy or

b) decide not to merge the unacceptably-expensive-to-maintain code,
leaving us with a toy or

c) simply cannot work out how to implement the missing functionality.


So perhaps we can proceed by getting you guys to fill out the following
paperwork:

- In bullet-point form, what features are present?

- In bullet-point form, what features are missing, and should be added?

- Is it possible to briefly sketch out the design of the to-be-added
features?

For extra marks:

- Will any of this involve non-trivial serialisation of kernel
objects? If so, that's getting into the
unacceptably-expensive-to-maintain space, I suspect.

- Does (or will) this feature also support process migration? If
not, I'd have thought this to be a showstopper.



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