Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

Arjan van de Ven
2007-12-03T15:25:38Z

On Mon, 3 Dec 2007 11:27:15 +0100
Andi Kleen <andi@firstfloor.org> wrote:

> > Kernel waiting 2 minutes on TASK_UNINTERRUPTIBLE is certainly
> > broken.
>
> What should it do when the NFS server doesn't answer anymore or
> when the network to the SAN RAID array located a few hundred KM away
> develops some hickup? Or just the SCSI driver decides to do lengthy
> error recovery -- you could argue that is broken if it takes longer
> than 2 minutes, but in practice these things are hard to test
> and to fix.
>

the scsi layer will have the IO totally aborted within that time anyway;
the retry timeout for disks is 30 seconds after all.

--
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org