Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

Andi Kleen
2007-12-02T18:57:44Z

Ingo Molnar <mingo@elte.hu> writes:

> this patch extends the soft-lockup detector to automatically
> detect hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are
> printed the following way:

That will likely trigger anytime a hard nfs/cifs mount loses its
server for 120s. To make this work you would need a new
TASK_UNINTERRUPTIBLE_EXTERNAL_EVENT or similar and mark
all the places which depend on those.

I've also seen kernel modules that use semaphores like wait queues
While that gives a little funny results (high load average) it worked
so far, until this patch.

-Andi