Messages in this thread | | | Date | Fri, 16 Feb 2007 19:00:39 +0000 | Subject | Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. | From | Keir Fraser <> |
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On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@goop.org> wrote:
> Keir Fraser wrote: >> 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. > OK. So that makes the only config restriction the 100Hz ticks.
We can extend the Xen timer interface quite easily and get rid of this one too. In fact it doesn't *much* matter if the CONFIG_HZ differs from the Xen ticker rate -- we modified the Linux timer ISR to handle timer interrupts at arbitrary times already. The only drawback is that jiffies updates in burts if CONFIG_HZ is higher than the actual tick rate, and this can affect some calibration constants and cause Linux to print out some weird values at start-of-day.
-- Keir
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