From: Nauzad Sadry <nauzad@gmail.com>
To: Mark Williamson <maw48@cl.cam.ac.uk>
Cc: xen-devel@lists.sourceforge.net
Subject: Re: suspend operation in XEND
Date: Thu, 20 Jan 2005 15:24:35 -0800 [thread overview]
Message-ID: <aa7b01ec050120152463dd2002@mail.gmail.com> (raw)
In-Reply-To: <200501202254.25371.maw48@cl.cam.ac.uk>
So when does the event channel between the backend & front end drivers
break during suspend operation in XEND ??
Also when is the NETIF_INTERFACE_STATUS_DISCONNECTED status sent to
the front-end driver? I see code in the front-end driver that
processes this status type which results in the front-driver going to
a suspend state (like unregistering IRQs etc)
Nauzad
On Thu, 20 Jan 2005 22:54:25 +0000, Mark Williamson <maw48@cl.cam.ac.uk> wrote:
> > During Save & Migration, XFRD sends "xfr.suspend" message to XEND.
> > This results in XEND suspending the domainU. A part of the suspension
> > should involve XEND sending DISCONNECT message to the front-end driver
> > in domainU
>
> I don't think you'll find it. Migrations / suspensions are treated like a
> backend driver restart - at resume the frontend driver is notified that it
> needs to reconnect to the backend and is responsible for requeuing any
> pending requests.
>
> Instead of explicitly disconnecting the domain at suspend, the frontend driver
> just sorts everything out at resume.
>
> Cheers,
> Mark
>
> > I am trying to dig through the XEND python code & I am unable to find
> > this information. Can someone help ??
> >
> > Also can someone guide me through the set of functions that are called
> > by XEND as a part of suspend. What is the use of the the
> > domain_restart_schedule() ??
> >
> > Thanks
> >
> > Nauzad
> >
> >
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next prev parent reply other threads:[~2005-01-20 23:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-20 22:51 suspend operation in XEND Nauzad Sadry
2005-01-20 22:54 ` Mark Williamson
2005-01-20 23:24 ` Nauzad Sadry [this message]
2005-01-21 0:28 ` Mark Williamson
2005-01-21 1:05 ` Nauzad Sadry
2005-01-21 1:21 ` Mark Williamson
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