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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: |
"Jeremy Fitzhardinge" <jeremy@xxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> |
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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: |
"Christian Limpach" <Christian.Limpach@xxxxxxxxxxxxx> |
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Date: |
Fri, 16 Feb 2007 02:00:39 -0800 |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Steven Hand <steven.hand@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
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Fri, 16 Feb 2007 02:02:02 -0800 |
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Thread-topic: |
[patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. |
Jeremy Fitzhardinge wrote:
> Andrew Morton wrote:
> > On Thu, 15 Feb 2007 22:14:45 -0800 Dan Hecht
> <dhecht@xxxxxxxxxx> wrote:
> >
> >
> >>> config PREEMPT
> >>> bool "Preemptible Kernel (Low-Latency Desktop)"
> >>> + depends on !XEN
> >>> help
> >>> This option reduces the latency of the kernel by making
> >>> all kernel code (that is not executing in a critical section)
> >>>
> >>>
> >
> > Oh, so that's why it doesn't break when CONFIG_PREEMPT=y.
> In which case
> > that preempt_disable() I spotted is wrong-and-unneeded.
> >
> > Why doesn't Xen work with preemption??
> >
>
> I've forgotten the details. Ian? Keir? Steven? Maybe it
> can be done.
With CONFIG_PREEMPT, we can have preempted threads reference machine
addresses across save/restore. After restore, these machine addresses
will be incorrect.
Christian
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