Re: [NFS] kthread: update lockd to use kthread

[Christoph Hellwig <hch@infradead.org>]

On Fri, Aug 25, 2006 at 07:07:59PM +0200, Cedric Le Goater wrote:
> This kernel thread is a sub thread of the lockd thread. It's a bit more
> simple and does not require as much modification. It still depends on the
> way its parent is killed and it will require some more work when the sunrpc
> thread are fixed.

Yes, the whole sunrpc/nfs thread situation is rather difficult.

> The SIGKILL used to terminate the threads is a challenge ... it propagates
> to sub threads. Some other stuff that bother me in using the kthread api in
> sunrpc : nfs_callback_down() uses a wait on a completion with a timeout.
> This is not possible with the kthread but might not be really useful. dunno.

The usage look buggy to me because we can't guarantee thread exit.  But
I really don't even understand the requirements for those threads yet,
I wish someone could write up a coherent description.