Keir Fraser wrote:On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:
Keir Fraser wrote:We can extend the Xen timer interface quite easily and get rid of this one
This initial patchset does not include save/restore support anyway, so inOK. So that makes the only config restriction the 100Hz ticks.
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.
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.
That's why we'd very much like to get a get_cpu_speed paravirt-op implemented. I think this would be useful to work around these problems for Xen as well.