[CRIU] [criu]launch page-server in swrk mode

[Pavel Emelyanov]

On 03/10/2016 04:56 AM, Dengguangxing wrote:
> Hi, Pavel
> 
> 在 2016/3/9 20:40, Pavel Emelyanov 写道:
>> On 03/08/2016 03:16 PM, Dengguangxing wrote:
>>> Hi all,
>>>
>>> I am trying to lauch a page-server through criu swrk mode.
>>>
>>> The page-server will always exit with one pre-dump/dump call(with page-server opts).
>>> I've tried to set keep_open flag as true in rpc request. and it just acts the same way.
>>
>> Yup, page server exits once it sees the completion mark.
>>
>>> Am I wrong with the page-server swrk mode? How to lauch a page-server daemon in swrk mode
>>> and make it survive serveral pre-dumps?
>>
>> With the current API it's not possible since different pre-dumps page server should
>> put data into different image directories.
> 
> I've tested this with simple loop, launch page-server serveral times with the same image directory
>  on dest-host.

That's not correct. If you do pre-dumps then image directory for all new stuff should
change with --prev-images-dir argument. If you're trying to do live migration, look
at the p.haul stuff we have, it does all the tricks with page server and pre-dumps.

https://github.com/xemul/p.haul

> perform criu pre-dump and dump with page-server param, and copy the rest files.
> 
> criu restore on dest-host succeed.

:)

> Does restoring succeed because of the simple loop process? or it just always do?

It just always does it best to succeed :)

-- Pavel