[openib-general] stuck process question

[Steve Wise]

On Thu, 2007-01-25 at 10:09 -0800, Roland Dreier wrote:
>     Steve> I have a process probably stuck in the IWCM or CMA waiting
>     Steve> on a refcnt to go to zero.  Does anyone know of a way to
>     Steve> figure out what the process is blocked on short of using a
>     Steve> kernel debugger?  Like once its stuck, is there any useful
>     Steve> information I can gather about what the process is waiting
>     Steve> on?
> 
> /proc/<pid>/wchan will show you where it's waiting.  And "echo t >
> /proc/sysrq-trigger" will put a stack trace of everything into the
> kernel log.
> 

Thanks!

I have no /proc/sysrq-trigger.  Is the a config option for the kernel?