[CRIU] Re: [PATCH 0/5] Add support to migrate processes

[Pavel Emelyanov]

On 08/21/2012 07:20 PM, Adrian Reber wrote:
> In order to migrate a process instead of writing the checkpoint
> image to disk this patchset introduces the functionality to
> listen on a network socket in the restore part to read the
> checkpoint image over the network. Right now this works for
> simple processes. To test this restore over the network
> functionality the different image files are right now just piped
> through netcat for the network transfer.
> A future patchset will provide the functionality to directly dump
> the checkpoint image to a network socket completely bypassing the
> disk during checkpoint and restore.
> 
> Still not using the 
>  # crtools dump -t 1234 | ssh root at restore.node crtools restore -t 1234
> approach as I also see a value having it implemented the way
> this patchset does it by opening a listen socket and waiting
> for a checkpoint image to be transmitted.

Can you describe in more details what the value is?

> v2:
> - do not close and reopen the socket for FDs to be out of the
>   way of FDs which are going to be restored. Just move the
>   network listen socket to a free FD
> - do not use a temporary file to store the pages-*.img but
>   just pass the socket FD into restorer.c. For this to work
>   the PAGE_SIZE'd read() in restorer.c had to be changed
>   to read in a loop until PAGE_SIZE has actually been read
> 
> .
>