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

From: Keir Fraser
Date: Fri Feb 16 2007 - 14:01:00 EST

On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> 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

-- Keir

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