linux-kernel - Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.

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Date:	Fri, 16 Feb 2007 11:03:06 +0000
From:	Keir Fraser <keir@...source.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Keir Fraser <keir@...source.com>
CC:	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@....de>,
	<xen-devel@...ts.xensource.com>,
	Ian Pratt <Ian.Pratt@...source.com>,
	<virtualization@...ts.osdl.org>,
	Steven Hand <steven.hand@...cam.ac.uk>,
	Christian Limpach <Christian.Limpach@...source.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and
 disableunsupported config options.

On 16/2/07 10:54, "Andrew Morton" <akpm@...ux-foundation.org> wrote:

> OK, you're screwed.  I agree that the process freezer is the way out of that
> one.
> 
> Ingo said that he's clocked the freezer at a few milliseconds.  But if it's
> any higher than that it'll need to get sped up once we convert cpu hotplug
> to use it.

A few milliseconds is acceptable. Presumably that is under some stress
workload? What we'd really like is to be able to gang-hotplug CPUs to
amortise the freezer overhead.

This initial patchset does not include save/restore support anyway, so in
fact it would be consistent to have CONFIG_PREEMPT configurable. I'm sure
that we are going to have some nasty bugs to fix up as a result, but we
can't fix them until we find them! Then we can convert our save/restore code
to use the freezer before submitting it for inclusion.

 -- Keir

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