what is umtxn

[Giorgos Keramidas]

On Fri, 5 Dec 2008 19:35:34 +0100 (CET), Wojciech Puchar <wojtek at wojtek.tensor.gdynia.pl> wrote:
> i've got once my asterisk process in umtxn state (as top shows) using
> 100% CPU.
>
> it was still answering calls.
>
> what's umtxn exactly?

A kernel lock operation.  ``procstat -k PID'' may show more details
about the in-kernel stack of the process that spins on the lock.