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xen-devel
[Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and d
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To: |
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. |
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From: |
Keir Fraser <keir@xxxxxxxxxxxxx> |
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Date: |
Fri, 16 Feb 2007 11:03:06 +0000 |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Steven Hand <steven.hand@xxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
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Fri, 16 Feb 2007 03:02:29 -0800 |
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[patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. |
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On 16/2/07 10:54, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> 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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