[libvirt] [PATCH v7] qemu: Introduce state_lock_timeout toqemu.conf

[wang.yi59 at zte.com.cn]

> On Thu, Sep 13, 2018 at 18:47:55 +0800, Yi Wang wrote:
> > When doing some job holding state lock for a long time,
> > we may come across error:
> >
> > "Timed out during operation: cannot acquire state change lock"
> >
> > Well, sometimes it's not a problem and users want to continue
> > to wait, and this patch allow users decide how long time they
> > can wait the state lock.
>
> [1]
>
> > #
> > #max_queued = 0
> >
> > +
> > +# It is strongly recommended to not touch this setting
>
> A statement like this seems like a strong indication that such a setting
> should not even exist in a user-configurable way. Also the [1] commit
> message justification does not inspire much confidence that it's needed.

The statement has been discussed and changed for many times, this time is
modified as this thread suggested:

https://www.redhat.com/archives/libvir-list/2018-September/msg00477.html

Well, it seemed that this patch does not intrigue many maintainers' interest,
but in some condition it is really useful and convenient, and I suppose this
is the most simplest way to achieve this at present.

Of course if this is not suitable to let this patch into upstream, I will not
continue to update it :)

Thanks to everyone again.

---
Best wishes
Yi Wang