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

Hi again,
 As has been pointed out to me that patch applies but does not compile.
I have done git pulls periodically to see if there are any changes but I
have gotten '...up-to-date...' messages so I assumed that meant there
were no changes.  Unfortunately there were, so that patch will not work.






Tab,

When using the straight git, if kcomd is compiled as a module, the
following error pops up.

hpc/built-in.o(.text+0xe57): In function `comm_accept':
hpc/comm.c:296: undefined reference to `sock_alloc'
make: *** [.tmp_vmlinux1] Error 1

It's due to sock_alloc being declared static (KCOMD_NSTATIC) unless
kcomd is selected as 'y'.  

Attached is a patch to let it compile if kcomd is a 'm' or a 'y'.





On Wed, 2006-07-12 at 01:25 +0000, 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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diff -Naur a/fs/select.c b/fs/select.c
--- a/fs/select.c	2006-07-14 10:03:34.000000000 -0600
+++ b/fs/select.c	2006-07-14 09:55:47.000000000 -0600
@@ -283,7 +283,7 @@
 
 	return retval;
 }
-#ifdef CONFIG_KCOMD
+#ifdef CONFIG_KCOMD_MODULE
 EXPORT_SYMBOL_GPL(do_select);
 #endif
 
diff -Naur a/include/linux/compiler.h b/include/linux/compiler.h
--- a/include/linux/compiler.h	2006-07-14 09:44:36.000000000 -0600
+++ b/include/linux/compiler.h	2006-07-14 09:44:16.000000000 -0600
@@ -42,7 +42,7 @@
 #define OM_NSTATIC static
 #endif
 
-#ifdef CONFIG_KCOMD
+#if defined(CONFIG_KCOMD) || defined(CONFIG_KCOMD_MODULE)
 #define KCOMD_NSTATIC
 #else
 #define KCOMD_NSTATIC static
diff -Naur a/net/socket.c b/net/socket.c
--- a/net/socket.c	2006-07-14 10:01:08.000000000 -0600
+++ b/net/socket.c	2006-07-14 09:54:21.000000000 -0600
@@ -484,7 +484,7 @@
 	put_cpu_var(sockets_in_use);
 	return sock;
 }
-#ifdef CONFIG_KCOMD
+#ifdef CONFIG_KCOMD_MODULE
 EXPORT_SYMBOL_GPL(sock_alloc);
 #endif