Re: [RFC][PATCH 1/2] Track in-kernel when we expect checkpoint/restart to work

[Oren Laadan <orenl@cs.columbia.edu>]

Ingo Molnar wrote:
> * Daniel Lezcano <dlezcano@fr.ibm.com> wrote:
> 
>>> By the way, why don't you introduce the reverse operation ?
>> I think implementing the reverse operation will be a nightmare, IMHO 
>> it is safe to say we deny checkpointing for the process life-cycle 
>> either if the created resource was destroyed before we initiate the 
>> checkpoint.
> 
> it's also a not too interesting case. The end goal is to just be able to 
> checkpoint everything that matters - in the long run there simply wont 
> be many places that are marked 'cannot checkpoint'.
> 
> So the ability to deny a checkpoint is a transitional feature - a 
> flexible CR todo list in essence - but also needed for 
> applications/users that want to rely on CR being a dependable facility.
> 
> It would be bad for most of the practical usecases of checkpointing to 
> allow the checkpointing of an app, just to see it break on restore due 
> to lost context.

Actually it need not wait for restore to fail - it can fail during the
checkpoint, as soon as the unsupported feature is encountered.

Adding that flag of what you suggest will help make it more vocal and
obvious that a feature isn't supported, even without the user actually
trying to take a checkpoint. I  like that I idea.

Oren.

> 
> 	Ingo
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