[patch] zfs livelock and thread priorities

[Artem Belevich]

Ben,

My system had eventually deadlocked overnight, though it took much
longer than before to reach that point.

In the end I've got many many processes sleeping in zio_wait with no
disk activity whatsoever.
I'm not sure if that's the same issue or not.

Here are stack traces for all processes -- http://pastebin.com/f364e1452
I've got the core saved, so if you want me to dig out some more info,
let me know if/how I could help.

--Artem



On Mon, Apr 27, 2009 at 6:39 PM, Artem Belevich <fbsdlist at src.cx> wrote:
>> I've updated the patch to use va_copy().  Unfortunately I don't have an
>> AMD64 machine to test on at the moment.  However, I did look at other places
>> in the kernel where va_copy() is used so I am hopeful I got it right.
>
> The latest diff does not crash on amd64. That's the good news.
>
> Even better news is that the hang that I had with enabled ZIL under
> heavy load now seems to be gone.
> The build that was usually triggering the hang after about an hour has
> been going for about three hours now.
>
> Thanks a lot for the diff. It does help to bring ZFS on FreeBSD closer
> to production quality.
>
> --Artem
>