Re: xen 4.5.0 packages available

[Roger Pau Monné <roger.pau%citrix.com@localhost>]

Hello,

El 10/02/15 a les 17.23, Greg Troxel ha escrit:
> 
> Miguel Clara <miguelmclara%gmail.com@localhost> writes:
> 
>> On Tue, Feb 10, 2015 at 2:54 PM, Greg Troxel <gdt%ir.bbn.com@localhost> wrote:
>>
>>> I don't think we should refuse to stop, especially at shutdown.  Instead
>>> there should a) be a fix - this is just broken or b)  an explicit
>>> failure to restart.
>>
>> Broken?
>>
>> I tough this was by desing?
> 
> Yes, I did mean broken.   All programs that I know of can start and stop
> repeatedly, including routing protocol daemons, mail daemons,
> filesystems, and really everything else.  It seems like an obvious
> requirement for normal operation.
> 
> I can certainly see that this might have been a bit tricky, and don't
> fault people for putting it last, but I really don't see how it makes
> sense as a design.
> 
>> In linux, and even freebsd dom0 xenstored can not be restarted, and the
>> init script does not attempt to stop it, IRRC this is how it works on linux
>> since 4.2 (I might be mistaken here).
> 
> Do you understand why this is so hard to fix?  Generally kernel
> interfaces deallocate on close and can be reopened.

Xenstore itself can be restarted, it is nothing more than a key value
pair database. The problem is that kernel and user-space components
register watches with xenstore, which are lost when xenstore is
restarted. I've heard oxenstored (the OCaml version of xenstored) is
able to handle this, but I've not tried it myself, see:

http://lists.xen.org/archives/html/xen-devel/2012-07/msg01692.html

Roger.