Re: [Xen-users] 'xm list' states

[Timo Benk <timo.benk@xxxxxx>]

Thanks so far, 

that made many points clearer for me.

One last quesetion: The 's'-flag, in my understanding quite
obvious, will be shown when the Domain will be shutdown.

But if i do a 'xm shutdown' and watch the 'xm list' output, the
's' flag is never shown. 

In the manual page is a hint "FIXME Why should you ever see this
state".

Can i assume that this flag is quasi non-existing or does not work?

Greetings,
-timo

On Mon, 24 Apr 2006 13:55:37 +0200
"Petersson, Mats" <Mats.Petersson@xxxxxxx> wrote:

> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Timo
> > Benk Sent: 24 April 2006 12:38
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] 'xm list' states
> > 
> > Hi,
> > 
> > can someone explain the states shown by the 'xm list' command?
> > 
> > 'r' (running) - The domain is currently running.
> > - This flag is always shown for the Domain 0, but never for
> >   unprivileged domains, why?
> 
> Presumably because you're on a single processor machine, you never
> see anything other than Dom0 running (as Dom0 MUST be one running
> to show the 'xm list' output). In a Multi-processor
> (multi-core/thread) system, you could have more than one domain
> running at any given time. Obviously, this assumes that the DomU(s)
> are actually DOING something, (like "for((;;)) { ; }" in a shell) -
> if it's just sitting there waiting for someone to send a net-packet
> or type on a keyboard, it wouldn't be running... 
> 
> > 
> > 'b' (blocked) - The domain is blocked.
> > - What does that mean? Why should a domain be blocked?
> 
> It's blocked waiting for something, usually an interrupt (for
> example, waiting for hard-disk data to be passed over to the
> domain). Also, things like "sleep 5" in the shell would cause
> "blocked", as the domain is waiting for a number of timer ticks (5
> seconds worth of) to pass. 
> 
> > 
> > 'p' (paused) - The domain is paused.
> > - Ok, that one is easy, the domain was paused with 'xm pause'
> 
> Yup.
> > 
> > 'c' (crashed) - The domain has crashed.
> > - If i do 'echo 1 > /proc/balloon' inside a unprivileged domain, i
> >   will get a kernel panic. But the state says nothing about that?
> > The domain is definitively crashed, but the xm list command says
> > nothing about that. Why?
> 
> It may be that the crash isn't detected properly by hypervisor - I
> think this may only work under some circumstances. I don't know for
> sure, I'm just guessing here.
> 
> > 
> > 'd' (dying) - The domain is in the process of dying.
> > - Well, poor little domain, but what does that mean?
> 
> Something has told the domain to "kill itself" (such as "xm
> shutdown/destroy", but it's not yet disappeared. It's probably
> there for the purpose of avoiding race-conditions where something
> is killing the domain, and something else is talking to it (for
> example disk accesses), and we don't want to retry operations that
> fail because the domain is disappearing - where it would make sense
> to retry it on a "living" Domain. 
> 
> > 
> > Maybe anybody here who can clearify the meanings of the 
> > state. The manual page is not very helpful.
> 
> I hope this is of some help. 
> 
> --
> Mats
> > 
> > Many Thanks and greetings,
> > -timo
> > --
> > Timo Benk
> > PGP Public Key: http://vs241071.vserver.de/timo_benk_gpg_key.asc
> > 
> > 
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> > 
> > 
> 
> 
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> 


-- 
Timo Benk
PGP Public Key: http://vs241071.vserver.de/timo_benk_gpg_key.asc


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