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From: Keir Fraser <>
To: Andrew Morton <>,
	Keir Fraser <>
Cc: Chris Wright <>, Andi Kleen <>,
	Ian Pratt <>,
	Steven Hand <>,
	Christian Limpach <>,
Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.
Date: Fri, 16 Feb 2007 11:03:06 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 16/2/07 10:54, "Andrew Morton" <> 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

  reply	other threads:[~2007-02-16 11:03 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16 10:00 Christian Limpach
2007-02-16 10:09 ` Andrew Morton
2007-02-16 10:47   ` Keir Fraser
2007-02-16 10:54     ` Andrew Morton
2007-02-16 11:03       ` Keir Fraser [this message]
2007-02-16 17:46         ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-16 19:00           ` Keir Fraser
2007-02-16 19:24             ` Jeremy Fitzhardinge
2007-02-16 21:51             ` Zachary Amsden
2007-02-16 22:38               ` Dan Hecht
2007-02-17 15:06                 ` Rik van Riel

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