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Re: [Xen-devel] RUNSTATE_runnable delta time for idle_domain accounted to HVM guest.

>>> On 07.05.14 at 15:33, <konrad.wilk@xxxxxxxxxx> wrote:
> On Wed, May 07, 2014 at 09:07:32AM +0100, Jan Beulich wrote:
>> >>> On 06.05.14 at 19:36, <konrad.wilk@xxxxxxxxxx> wrote:
>> > The reason we schedule a tasklet instead of continuing with an
>> > 'vcpu_kick' is not yet known to me. This commit added the mechanism
>> > to do it via the tasklet:
> I should also add that a bit more digging and I realized that
> the reason we have so many of the tasklets running (the guests
> couldn't be that insane to schedule so many alarms for one-shot timers!)
> is that we do PCI passthrough. And that uses the 'hvm_dirq_assist'
> tasklet (hvm_do_IRQ_dpci). As in we serialize passthrough interrupts
> for all of the guests via this tasklet lock. 

Now that is indeed something in need of improvement. I'm afraid
the Intel guys who wrote all this aren't around anymore...


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