[CRIU] Reg unix stream checkpointing and other issues.

[Sanidhya Kashyap]

Thanks for the info Pavel.


>
>>>
>>> This is AIO mapping. We're working on supporting this, patches are
>>> expected to appear by v1.4 :)
>>>
>>
>> That's great!! When can I expect the 1.4 version? Or are those patches
>> already upstreamed?
>
> Our release policy is like this: http://criu.org/Release_schedule
> But note, that releases are time-driven, not feature-driven. So if
> the patches are not ready till 1.4 they are delayed till next release.
>

Well, is the AIO patch available on the mailing list? If yes, it would
be great if you can point out the thread link which I can look at.

>>
>> I guess for the device mapping, we have to write separate mechanism to
>> work with those.
>
> Yes. We have plugins engine (http://criu.org/Plugins). In case we'll
> need to support devices, we will add plugin hooks into respective places.
> But so far we haven't met this requirement.
>

Awesome! How did I miss it :-/


>> By API do you mean kernel API or something else?
>
> I mean CRIU API. We have 3 of them (http://criu.org/API_compliance).
> As far as multiple PIDs feature is concerned, we will probably need to:
>
> 1. make the --tree option accept the comma/colon-separated list
> 2. fix the pstree (process tree) restore code to bear with multiple
>    root tasks
> 3. audit the code for checks for root process and think would they
>    break or not (there are a couple of places about it)
> 4. test it. I'd suggest modifying the zdtm suite so that it launches,
>    dumps and restores more than one test at a time
>

Then, I'll look at these in sometime as I am quite interested.

Another question that I have in my mind is about the restoring of the
process. Well, with the help of memory changes tracking, we can
decrease the freeze time of a process while checkpoitning, but what
about the restore? I guess, that tracking part can't be used in the
case of restoration.

What are the possible ways to improve the restore similar to the checkpointing?

Thanks,
Sanidhya