[CRIU] Restoring with different PID

[Kir Kolyshkin]

On 05/07/2013 11:06 AM, Pavel Emelyanov wrote:
> On 05/06/2013 11:09 PM, Bhargav Bhikkaji wrote:
>> Hi All,
>>
>> A process on VM-1 is running with PID: 26861. Check-pointed this process using following command
>>
>> ./criu dump -vvvv -D /root/download/test-images/ -o /root/download/test-images/dump.log -t 26861 -R --shell-job && echo OK
>>
>> Moved *.img files on to VM-2 and restored them with following command.
>>
>> ./criu restore -vvvv -d -D /root/download/test-images -o /root/download/test-images/restore.log -t 27397 --shell-job && echo OK
>>
>> Pls note, tried to restore with different process ID but what is observed is that *restore* always restores with original process id it was check pointed with.
>>
>> Is it possible to change the process id during restore ?
> It's almost impossible. The thing is that tasks tend to keep pid-s values in their
> internal data structures and we cannot change these numbers, as we do not know the
> logic used by tasks.
>
> One of examples of pids storing is glibc -- it caches the pid value e.g. for speeding
> up the getpid() function.
>
> Thus I see no ways for restoring a task with its pid changed.

So should we remove -t argument from criu restore then? It's not working 
as expected, and it's not needed as far as I understand.