Re: om 2.6 Opteron last git, trying to migrate a simple task

Hi Florian,

as far as I know OM is _not_ preemtive safe. Checking this is on the
ToDo list: <http://openmosix.snarc.org/wakka.php?wiki=ToDo>

I can't help you with your debugging questions though.

Cheers,
Niels

On Mon, 2006-08-28 at 16:54 +0200, Florian Delizy wrote:
> Hi,
> 
> I am getting at it right now, for a simple test, I am trying to migrate 
> a simple task from a node to another node, and it seems not to work at 
> all. Instead of migrating the process, it gives me an "Oups" :
> 
> 
> When I try to migrate the process using the command:
> 
> echo 192.168.169.11 > /proc/7623/om/where
> 
> I get this :
> 
> |-------------------- OUPS start here : 
> ----------------------------------------------------------------------------|
> 
> Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
> <0000000000000000>{stext+2145382632}
> PGD 13d667067 PUD 13d6fa067 PMD 0
> Oops: 0010 [1] PREEMPT
> 
> CPU 0
> Modules linked in: thermal processor fan
> Pid: 7623, comm: eatcpu Not tainted 2.6.17-om #1
> RIP: 0010:[<0000000000000000>] <0000000000000000>{stext+2145382632}
> RSP: 0000:ffff81013d7cbef8  EFLAGS: 00010292
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff81013e48b0c0
> RDX: 0000000000001000 RSI: 00007fff82c0b670 RDI: ffff81013f6207e0
> RBP: 0000000000000000 R08: 0000000000000218 R09: 000000000000fa57
> R10: 0000000000000000 R11: ffff81013ead7c00 R12: ffff81013e48b0c0
> R13: 00007fff82c0b670 R14: 0000000000000000 R15: 0000000000000000
> FS:  00002b4c281f36d0(0000) GS:ffffffff807f9000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000000 CR3: 000000013d798000 CR4: 00000000000006e0
> Process eatcpu (pid: 7623, threadinfo ffff81013d7ca000, task 
> ffff81013f6207e0)
> Stack: 0000000a00000009 0000000000000000 0000000000000000 ffffffff8032c87e
>        ffff81013f6207e0 ffffffff80329129 0000000000000202 ffffffff803292eb
>        ffff81013f6207e0 ffffffff80328c67
> Call Trace: <ffffffff8032c87e>{task_move_to_node+41}
>        <ffffffff80329129>{task_request_move+40} 
> <ffffffff803292eb>{task_do_request+37}
>        <ffffffff80328c67>{openmosix_pre_usermode+28} 
> <ffffffff8020aa13>{retint_careful+45}
> 
> Code:  Bad RIP value.
> RIP <0000000000000000>{stext+2145382632} RSP <ffff81013d7cbef8>
> CR2: 0000000000000000
> 
> |-------------------- OUPS ends here 
> ----------------------------------------------------------------------------|
> 
> 
> The code I am trying to migrate is a simple C program :
> 
> 
> int main( int argc, char **argv )
> {
>         double total = 456114157974121;
>         double min = 0;
>         double max = total;
> 
>         double square = ( min + max ) / 2.0;
>         while ( total != square * square )
>         {
>                 if ( (square*square) < total )
>                 {
>                         min = square;
>                 } else if (square*square > total ) {
>                         max = square;
>                 }
>                 square = ( min + max ) / 2;
> 
>         }
>         return 0;
> }
> 
> 
> 
> Kernel is a 2.6.17 (it gives me the same result with a 2.6.17.8), with 
> the preempt kernel option. I will try to get some more interesting 
> output, but first, is openmosix preemtive safe ??
> 
> -------------------------------------------------------------------------
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>

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642

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