Re: om-2.6 patch for kcomd (pre-pre-alpha)

Well done Matt.


On Tue, 11 Jul 2006, Matt Dew wrote:

> Hi all,
>   Here's a patch to the current git tree (7/11/06) that contains the new
> kcomd code.   kcomd is the new kernel daemon that handles migration for
> the processes.
>
> Moshe, Bruce, if this patch is too large I can put it on a web server
> for people to download.   ?
>
> There is a README included but here's a quick intro.
>
> All communication between nodes is done via packets.  Each packet
> consists of a header, which has information about which pid this packet
> belongs to, how much data accompanies this packet, the type of packet
> (initial migration, system call, signal, etc), and the payload of data
> that immediately follows.
>
> The processes are responsible for generating the packets, adding them to
> linked lists and then signalling the kcomd daemon that a packet is ready
> for transmission.  All this is done in the kernelspace stubs of the
> userspace processes.  The userspace programs don't see anything.
>
> kcomd sleeps until there is work to do. Either a received packet to
> process or a packet to send.  Then goes back to slees.
>
> kcomd wakes up on the signal and sends the packet to the corresponding
> node.  When a packet is received, kcomd wakes up and checks to see which
> process this packet belongs to, puts it into the process's linked list
> and informs the process it has either new data or a response to a
> previously sent packet.
>
> The code isn't very clean but if I wait until I'm happy with it I'll
> never send it. :)
>
> compile kcomd as a module.
>
> Currently, issuing a migration command (echo $IP > /proc/../om/where)
> will send a migration init packet to the other node, which sends a
> reply.   You can run as many simulaneously as you want.  There doesn't
> appear to be any memory leaks.
>
> This is just to show that communications are working and the foundation
> plan is solid.  Adding the code for real migrations is next, as is a
> massive cleanup.  :)
>
> Please try the patch and review the code. I'm not a programmer and I am
> asking for help.  There are plenty of commented printk statements you
> can uncomment to get a better idea of what's happening.
>
>
> config options:
> #
> # HPC options
> #
> CONFIG_KCOMD=m
> CONFIG_OPENMOSIX=y
> # CONFIG_OPENMOSIX_VERBOSE is not set
> # CONFIG_OPENMOSIX_DEBUG is not set
> # CONFIG_OPENMOSIX_CTRL_FS is not set
>
> Matt
>
>

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